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• CSV engine on MySQL server

  - by Jeff

  I don't think that this is a programming question so I am going to ask it here - Reading the book high performance mysql, I read about the CSV engine. The paragraph says: The CSV engine can treat comma-separated values (CSV) files as table, but it does not support indexes on them. This engine lets you copy files in and out of the database while the server is running. If you export a CSV file from a spreadsheet and save it in the MySQL server's data directory, the server can read it immediately. Similary, if you write data to a CSV table, an external program can read it right away. CSV tables are especially useful as a data interchange format and for certain kinds of logging. What I get from this paragraph is that I can copy a .CSV file into the data directory of database, and it should show as a table that is able to be read from. However, whenever I copy a test .csv file into the directory, it does not appear as a table. I can't access it. I am using MySQL 5.5 also Does anyone know why this is not working, or what I am doing wrong? Thanks

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• Curios: What makes CPUs better than others? [closed]

  - by Zizma

  I have been wondering about this for a long while now and was hoping someone here could answer it pretty easily. If I was looking for the most powerful CPU what should I really be looking at? There are so many different parameters of a CPU and I am wanting to know what each thing does and what really matters. Basically this: What is the deal with cores? If I take using optimized applications out of the mix would it theoretically better to get quad core 1.0GHz CPU or a 1 core 4 GHz CPU? Also, what is the difference between maybe an Sandy Bridge CPU versus an Ivy Bridge CPU? If they both were had the same clock speed and number of cores would the Ivy Bridge perform better? Does an older Xeon with an equal clock speed and number of cores to a new i7 really perform worse/slower? Does size matter? Why would I go with a 22nm CPU over a 32nm when the size difference is so trivial? What about the cache? When does the cache come into play with performance?

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• Web Server Routing Based On Location

  - by Eric

  I have a website that has users from both Hong Kong and Australia. Unfortunately, since the server is located in Australia, users from Hong Kong are going to suffer latency problems. Traffic has to go through US before travelling back to Australia. So I've setup a server in Hong Kong as well, and users using the .hk TLD are going to be redirected to the Hong Kong web server. It shares the same database server with the Australian server but due to aggressive SQL query caching, impact on performance from latency from SQL queries are negligible. But for users accustomed to the Hong Kong website but have since traveled to Australia, they suffer from additional latency because they go to the .hk site which redirects to the HK server even when they're in Australia. The website is targeted at international students from Hong Kong so this is an significant issue for me. Instead of redirecting users to the closest web server based on the TLD, how do I redirect users based on their location? Currently I am using nginx, postgres and Django. Say I know how to estimate users' location based on users' IP addresses, what is my next step? At what level would I work on? What topic should I read up?

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• Thin client - cloud machine - to run via iPad, iPhone, most Androids etc

  - by Carl Lindberg

  I'm tired of having a laptop macbook that breaks down or having files that I need to sync via dropbox etc all the time via the machines to different OS installations. It sucks. I want a thin client where I can login on any machine - my iPhone, PC desktop, iPad etc to one running machine. I would like to replace a modernly powerful desktop iMac with a thin client running via my iPad. I will connect the iPad with a keyboard/mouse too so you get the idea. But I want to be able to use some of the Android phones as well (I guess most Android phones today has a good enough performance/resolution etc to run a thin client). Of course it has to be able to have input/output in sound. Printing can be solved by PDF/emailing etc - so no direct communication to the printer ports to USB etc is necessary. Is there such a service today? It should cost somewhere under something like $40/ month. I will run stuff like CPU heavy duty ableton for music production, xCode for making iOS apps, some games etc. And on the thin client also run virtual machines. VM of Ubuntu and Windows.

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• how to properly set environment variables

  - by avorum

  I've recently started using Windows (having used Ubuntu up until now) and I find myself unable to properly set environment variables. Whenever I set them they don't seem to work. I've been going to Start-Edit Environment Variables for your Account and editing the PATH value in the upper half of the GUI. Here's what I've got so far. ;C:\Chocolatey\bin;C:\tools\mysql\current\bin;C:\Program Files (x86)\Git\bin;C:\Program Files\MySQL\MySQL Server 5.6\bin\;C:\Python33\Scripts; These are each the parent directories of the executables I'd like to be able to run by name from CMD, but mysql, git, and pip aren't being recognized. Am I doing something wrong syntactically or at a general understanding level? I'd like to be able to run these commands without having to specify the full path to the executables every time. EDIT: The full PATH extracted from CMD PATH=C:\Python33\;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Program Files (x86)\AMD APP\bin\x86_64;C:\Program Files (x86)\AMD APP\bin\x86;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\GTK2-Runtime\bin;C:\Program Files\WIDCOMM\Bluetooth Software\;C:\Program Files\WIDCOMM\Bluetooth Software\syswow64;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files (x86)\QuickTime\QTSystem\;C:\Program Files (x86)\Common Files\Acronis\SnapAPI\;C:\Program Files (x86)\Java\jre7\bin;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files (x86)\Microsoft SDKs\TypeScript\;C:\Program Files (x86)\MySQL\MySQL Utilities 1.3.4\; ;C:\Chocolatey\bin;C:\tools\mysql\current\bin I'm being forced to use Windows by my work environment, I don't enjoy the state of affairs.

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• Windows 7 Loading Very Slow

  - by Adnan

  Hi guys, I've had a problem that only started to occur yesterday. When I boot into Windows 7 and log on to my user account, the computer gets very laggy and slow for at least 5 minutes. Icons take ages to load, and everything is rendered unclickable. This happens for about five minutes after which everything goes back to normal. I tried restarting a few times to see if this is a recurring problem, and it is. I ran a full system scan with Microsoft Security Essentials and found nothing wrong, and I also defragmented the disk to increase performance. However, the problem still exists. Edit: For the past day, I've been trying to install Ubuntu on the same laptop. When installing it on a partition didn't work, I decided to use Wubi. Could this somehow be the problem? Also, my hard drive gets hot a lot, so could the heat be affecting the hard drive and maybe making it defective? Any help on this issue would be greatly, greatly appreciated.

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• I need help choosing between two configurations of the Dell Studio 14

  - by Adnan

  There are two configurations of the Dell Studio 14 (1458) which I'm looking at: Config 1: Core i7-720QM @ 1.6 GHz; ATI Mobility Radeon HD 5450 1GB; 4gb DDR3 RAM @ 1066 MHz; 500 GB SATA HDD @ 7200 RPM; Price: $999 Config 2: Core i5-430M; ATI Mobility Radeon HD 4530 512MB; 4GB DDR3 RAM @ 1066 MHz; 500 GV SATA HDD @ 7200 RPM; Price: $874 What I want to know is, would config 1 still be able to do decent gaming (maybe some Starcraft II), and is there a great performance difference between the i5 and i7 processors? Is the $130 extra worth it for the i7 and better graphics card? I do more than just basic computing. I plan on getting into web design (specifically using Photoshop and Dreamweaver), and I wish to do gaming. I know Conifg 1 is the better value, but I want to be sure that the $130 more is truly worth it. I dont have too much money and want to spend wisely as possible, yet I am a computer geek and plan on doing a lot more than the average user.

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• Streaming to PS3 with NAS and built-in dlna server?

  - by philt

  With consumer-grade hardware, is it possible to successfully stream 1080p mp4 videos to a PS3? I have a linksys router that can only do 10/100. The PS3 is wired to it with cat5e cable, and the PS3 itself supports gigabit ethernet. I would upgrade the router and get one that supports gigabit ethernet if it could handle streaming like this. It currently does work with minor jerkiness streaming from my mac to the PS3, but fast-forward/reverse and "goto" (equivalent of scene selection) take forever and/or fail completely. And streaming from my mac of course requires the mac to be on at all times. When I put the movies on an external USB drive and connect to the PS3 directly, it performs flawlessly. Fast forward and everything works great. So I was thinking about getting a NAS, but I don't know if any inexpensive NAS (i.e. Buffalo Linkstation Live, WD My Book World Edition, D-Link DNS-321, etc.) can actually deliver the performance necessary to do this, even with gigabit ethernet?

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• apache 2.4, mod_proxy_fcgi not honouring .htaccess, work around needed

  - by user229874

  I am using apache 2.4.7 with mod_proxy_fcgi for purpose of passing through php to php-fpm (this will be used for shared hosting environment). The htaccess works fine for non php files, but once it hit rewrite rule that proxies through the php requests, the htaccess is ignored. I know why it is happening. The question is: how do I work around it? The question how do I force apache to treat the request to php file as a request to local file, and then proxy it through? I have spent substantial time in researching on this problem, and following "answers" were given as solution: 1) "use apache configuration instead of .htaccess" it is valid solution, but not for shared hosting environment (I am not going to give access to apache configuration to shared hosting customers ;)). 2) "don't use .htaccess, as it has performance/security/other issues", well how else would shared hosting customers control access/url rewriting on their site? Besides if the .htaccess was not a requirement I would simply use nginx. 3) "put rewrite rule for proxy inside of " - this is incorrect, and it does not work. This behaviour appears to be not a bug but a "feature" as per https://issues.apache.org/bugzilla/show_bug.cgi?id=54887

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• What is Best storage servers infrastructure ? DAS/NAS/SAN or installing GlusterFS/LUSTER/HDFS/RBDB

  - by TORr0t

  I am trying to design an infrastucture for the project I am working on. It would be somehow a file-sharing/downloading project (like rapidshare) and I would need high storage sizes and good scability, and I would add new storage nodes after my project grows up. I have come up with 3 solutions for my project which are using Luster, GlusterFS, HDFS, RDBD. For start, i would have 2 servers, one server is for glusterfs client + webserver + db server+ a streaming server, and the other server is gluster storage node. (After sometime, i would be adding more node servers, and client servers (dont know how many new client new servers to add, will see later) So, i am thinking to work with glusterfs. But i really wonder that if i have to use high performance servers with high sotrage sizes or avarage/slow servers with high storage sizes? Or nas/das/san solutions are better for glusterfs storage nodes? I might buy a nas and install glusterfs onto it. I would be happy to listen to your recommendations for the server properties (for each clients and nodes) . I really dont know if I really need high amount of ram and good cpus to for the nodes. I am sure i need it for client servers. The files would be streamed as well, so the Automatic file replication is important, thus, my system should work like a cloud, when needed, according to high traffic, the storage nodes should copy the most demanded file to be streamed and would help me to get rid of scability problems and my visitors would able to stream/download those files. Also, i am open to your experiences/thoughts about any good solution. Luster, hdfs, rbdb are the other options and i would be happy to listen to your thoughts here. I would be very very happy to hear back from anyone commented of any words I have used here. Thanks

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• Ruby Passeger + Nginx or lighthttpi + fgci for shared hosting

  - by devnull

  I have set up a passenger + nginx setup and I plan to offer a free non-commercial hosting (or in fact on the fly deployment) for rack-based frameworks (e.g. camping, sinatra). I am facing an "issue" with passenger. For each application you need to configure nginx.conf (it would be the same with apache so it is not an nginx issue) with: server { ... passenger_base_uri /app1; passenger_base_uri /app2; passenger_base_uri /app3; } Now this is not inherently bad as, in theory, I could allow a user to run just one app on his webspace but even in this case I need to create a new server directory on nginx e.g. (user.domain.com). As this will mainly be used to deploy apps the behavior I am looking at is more the possibility to auto map several apps (e.g. app1, app2, app3, app4) under the same server (your app.com/app1 yourapp.com/app2) without having to update the nginx or apache file each time. This seems to be a limitation in passenger. As such I am thinking about an alternative with lighttpd and fastcgi. Would this allow immediate deployment without touching the lighttpd config file e.g. I create a new directory with app2 and it will run immediately ? What is your experience in performance difference between passenger + nginx vs. lighttpd + fastcgi ? thanks in advance scenario details: on nginx + passenger - user cannot add a new sub-folder and run another sinatra/camping app without declaring the path on nginx.conf and restarting the server; wished behavior with the new setup: - user can add a new folder with a new app and it would run on lighttpd+fcgi without any extra configuration of the web server;

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• HyperV - low CPU usage

  - by Klark

  I am very new to HyperV and virtual machine philosophy in general, so please expect more or less nooby questions :) I have a server that is only used as a host for virtual machines. OS is windows server 2008 R2 and it is running on 16 CPU and 48 GBs of RAM. On aforementioned server there are 8 VMs, each having 4 CPUs and 4 GBs of RAM. On those VMs we are running some CPU intensive tasks. Each machine has nearly 100% cpu usage. After I noticed slow performance I went to the host machine and started playing with process explorer. It turned out that cpu usage is very low. Also I/O is very low, and of course, memory consumption is high, which is expected. Of course, I don't expect that those 4 virtual cores dedicated to a VM work as fast as real, hardware 4 cores, but still I expected a higher consumption of real hardware. Is this sort of behaviour normal? I see that the most of CPU usage on host machine are marked as interrupts (which I guess is normal) and all those interrupts are passed to only one core (which is strange). Are there out of box optimization that I could perform to finally use all that processing power that is under the hood. My knowledge of virtualization technology is near to embarrassing, so I would be grateful for any links that could enlightened me :) Thanks.

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• Failover strategy for a 4 servers scenario

  - by Joao Villa-Lobos

  Hi all, I am trying to figure out how to set up replication & failover in a scenario with 4 servers (2 per location) where any server may assume the Master role. My initial scenario is the following one: 2 servers in location A (One Master, One Slave); 2 servers in location B (Two Slaves). For this I'm thinking on using the configuration Master-Master Active-Passive suggested on O'Reilly's "High Performance MySQL" on all of them so each one can become a Master when needed. If the Master "dies" the other server from location A assumes the Master role whenever possible. It will always have a bigger priority then the servers on location B. A server on location B will only switch to Master if no server on location A is able to do so. Since MySQL can't handle this automatically I need some other way to implement this. I've read already about heartbeat and Maatkit. Is this the way to go? Has anyone used this in a similar scenario? Is there some other way to go in order to achieve this? Any pointers about failout will be appreciated. I want to keep this as simple as possible avoiding stuff such as DRDB. I'm not concerned about high availability just a way to switch roles automatically without too many hassle. I'm using SuSe Enterprise 10 and MySQL 5.1.30-community. Thanks in advance, João

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• Defeating the RAID5 write hole with ZFS (but not RAID-Z) [closed]

  - by Michael Shick

  I'm setting up a long-term storage system for keeping personal backups and archives. I plan to have RAID5 starting with a relatively small array and adding devices over time to expand storage. I may also want to convert to RAID6 down the road when the array gets large. Linux md is a perfect fit for this use case since it allows both of the changes I want on a live array and performance isn't at all important. Low cost is also great. Now, I also want to defend against file corruption, so it looked like a RAID-Z1 would be a good fit, but evidently I would only be able to add additional RAID5 (RAID-Z1) sets at a time rather than individual drives. I want to be able to add drives one at a time, and I don't want to have to give up another device for parity with every expansion. So at this point, it looks like I'll be using a plain ZFS filesystem on top of an md RAID5 array. That brings me to my primary question: Will ZFS be able to correct or at least detect corruption resulting from the RAID5 write hole? Additionally, any other caveats or advice for such a set up is welcome. I'll probably be using Debian, but I'll definitely be using Linux since I'm familiar with it, so that means only as new a version of ZFS as is available for Linux (via ZFS-FUSE or so).

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• How much memory will a Windows file-server be able to use effectively.

  - by Zoredache

  In the near future we will be moving our fileserver to a newer box that will be running Windows 2008R2. I want to know how much memory Windows will be able to use for a system that is just a file-server. In searching around I found an old document for Windows 2000 that mentions the maximum size of the file-system cache is 960MB. I suspect this limit no longer applies, but is there a new limit? The file server will be just a standard Windows fileserver. It will have 1TB of attached storage. The large majority of the of the files accessed during the day are just typical Office documents. There are 80-100 people usually using the fileserver during a typical day. This system will only be used as a file server, it doesn't have any other roles. In Windows 2008r2 is there any hard limits for the filesystem cache? What are they? The server we will be re-using for this purpose currently has 4GB of memory, but it can be maxed out at 16GB. Is there any value in doing this for a Windows file-server? Are there any performance counters can I look at on the existing 2003 fileserver that will tell me if adding more memory will be worthwhile.

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• Installing Trac on Windows under Apache 2.2?

  - by Warren P

  Trac is a python-powered bug-tracking and project-management app. According to Trac's wiki, there are several options for installing Trac, a standalone server (tracd), or under a dedicated webserver using one of these options: FastCGI - Not available on windows. mod_wsgi - No version of mod_wsgi available for Apache 2.2.22 and Python 2.7.3-amd64 that actually runs on my system! mod_python - no longer recommended, as mod_python is not actively maintained anymore) CGI -should not be used, as the performance is far from optimal) That leaves me with zero ways to run Trac on Windows. Apache 2.2.22 with ModWSGI loading, crashes the Apache2.2 service on startup without any error logs. Disabling the line in the apache configuration to load mod_wsgi restores sanity. I just want an installation of Trac on windows with Authentication enabled. I am unable to get authenetication to work using basic tracd like this: tracd -p 8000 --basic-auth="c:\tmp,c:\tmp\Passwords.md5.txt,mycompany" c:\tmp\RootFolder And I am unable to get Mod_WSGI installed. I'm going to keep trying to figure out a combination that works, I suspect I should have installed 32 bit python instead of 64 bit python, to start with. Did I do wrong to install Python 64 bit 2.7.3? I tried again with all 32 bit components, and still can't get MOD_WSGI to work with apache 2.2.22. I'm going to try to compile mod_wsgi myself with Visual C++ Express 2010, but it seems to me that it ought to be easier than this to get Trac running on windows, with authentication. Is there a way to run Trac on Windows, under Apache, with authentication? The last "Trac on windows" article died in 2008, leaving only this internet archive link for "Trac on windows" setup.

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• ColdFusion 9 server not restaring - “Permission denied” errors

  - by Xevi Pujol

  I had to restart my ColdFusion 9 server on CentOS because of a memory performance issue, but now the server won't restart again. When looking at cfserver.log I can see how there's "Permission denied" errors all along. The ColdFusion application folder (/opt/coldfusion9/) is owned by nobody:root, as that fixed a similar problem that we had a few weeks ago. Also, the last time this CF server was running correctly, the JRE user that was being used was nobody. Maybe CF is trying to restart using another user (presumably apache) and that creates permission issues? However, I'm not sure how to check this hypothesis. Where's the config file that tells CF what JRE user to utilize? If I can change that, I could try to specify nobody there. Any other ideas also welcome. UPDATE: The runtime user that Coldfusion will utilise is defined in /etc/init.d/coldfusion_9. I fixed the problem by being consistent with the users: I needed to revert the ownership of the folder /opt/coldfusion9/ back to apache:root, which matches the init file.

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• OpenWrt vs DDWrt

  - by Ioan Paul Pirau

  I have a TP-Link Wr1043ND router and I want to install one of these two firmwares: OpenWRT DD-WRT I read that I can install custom packages and do much more than I can with the original firmware. I would like to ask someone with experience in using both OpenWRT and DD-WRT which he would recommend and why. And to give a few reference points I'm interested in: reliability – network stability both on cable and wireless and on the usb drive performance – network speed, very important also usb drive speed configurability – the possibility to add extensions such as a torrent client, FTP, SSH, WWW and SVN server directly ease of use – the ease of installation and configuration of the router support/docs – how much info there is if you stumble upon a problem and you have to find some documentation, or if there's any free support (but that's a longshot) Of course I don't imagine that I will find the perfect firmware and that one is vastly superior over the other. Also if there's anyone out there who uses one of these firmwares on a TP-Link Wr1043ND, it would be great to get some feedback about the impact of the changes from the original firmware. P.S. I'm open also for Tomato if it's the better one.

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• Amazon CloudFront and EC2: Global Load Balancing

  - by Matt Rogish

  We have an app that is going to store and serve up a decent amount of data in S3 to a global audience where latency should be minimized. So, we've been doing tests with Amazon CloudFront and have seen favorable results. However, we need a thin middleware layer (to do security etc.) and we'd like to put that in EC2. Due to security restrictions, this middleware layer will do the file streaming from S3/CloudFront: S3/CloudFront - EC2 - Clients We can geographically distribute the EC2 nodes (US East/West, and Ireland) but the problem is that a client in the EU would hit our US server and be fed data from there, thus rendering much of the performance benefit of CloudFront moot. I've been digging through the EC2 docs but I can't find a built-in way to get a geographically distributed version of EC2 a la CloudFront. Elastic Load Balancing sounds like the way to go, but I can't seem to find a way with that to direct based on routing... Preferably, we'd like to keep the amount of stuff outside of EC2/S3/etc. to a minimum (for obvious reasons). Any ideas how to do that within the EC2/S3 framework? DNS/routing tricks? Thanks!

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• Replicated MongoDB server slower than simple shards

  - by displayName

  I tried to compare the performance of a sharded configuration against a sharded and replicated configuration. The sharded configuration consists of 8 shards each running on three different machines thereby constituting a total of 24 shards. All 8 of these shards run in the same partition on each machine. The sharded and replicated version is 8 shards again just like plain sharding, and all 8 mongods run on the same partition in each machine. But apart from this, each of these three machine now run additional 16 threads on another partition which serve as the secondary for the 8 mongods running on other machines. This is the way I prepared a sharded and replicated configuration with data chunks having replication factor of 3. Important point to note is that once the data has been loaded, it is not modified. So after primary and secondaries have synchronized then it doesn't matter which one i read from. To run the queries, I use an entirely different machine (let's call it config) which runs mongos and this machine's only purpose is to receive queries and run them on the cluster. Contrary to my expectations, plain sharding of 8 threads on each machine (total = 3 * 8 = 24) is performing better for queries than the sharded + replicated configuration. I have a script written to perform the query. So in order to time the scripts, I use time ./testScript and see the result. I tried changing the reading preference for replicated cluster by logging to mongo of config and run db.getMongo().setReadPref('secondary') and then exit the shell and run the queries like time ./testScript. The questions are: Where am i going wrong in the replication? Why is it slower than its plain sharding version? Does the db.getMongo().ReadPref('secondary') persist when i leave the shell and try to perform the query? All the four machines are running Linux and i have already increased the ulimit -n to 2048 from initial value of 1024 to allow more connections. The collections are properly distributed and all the mongods have equal number of chunks. Goes without saying that indices in both configurations are the same.

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• How to detect/list rogue computers connected to a WIFI network without access to the Wifi Router interface?

  - by JJarava

  This is what I believe to be an interesting challenge :) A relative (that leaves a bit too far to go there in person) is complaining that their WIFI/Internet network performance has gone down abysmally lately. She'd like to know if some of the neighbors are using her wifi network to access the internet but she's not too technically savvy. I know that the best way to prevent issues would be to change the Router password, but it's a bit of a PITA having to re-configure all wifi devices... and if the uninvited guest broke the password once, they can do it again... Her wifi router/internet connection is provided by the telco, and remotely managed so she can log-on to their telco account's page and remotely change the router's Wifi password, but doesn't have access to the router status page/config/etc unless she opts out of the telco's remote support and mainteinance service... So, how could she check if there are guests in the wifi with this restrictions and in the most "point and click way"? In this case I'd probably use nmap to look for other devices in the network, but I'm not sure if that's the easiest way to do it. I'm not a wifi expert, so I don't know if there are any wifi-scanning utils that can tell us who's talking to the router... Lastly, she's a Windows user as I guess that'll influence the choice of tools available Any suggestions more than welcome Regards!

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• Long access time for static web page on virtual machine

  - by Karol

  My setup Windows 7 on workstation that I use at work (with domain) and home (no domain) Virtual machine (VMWare) that runs Arch Linux (I will call it just "Linux") with network interface in bridged mode. Linux serves web pages with Nginx. IP address of Linux machine is 192.168.0.16 and is added to C:\windows\system32\drivers\etc\hosts: 192.168.0.16 bridged bri IP address of Windows workstation is added to /etc/hosts: 192.168.0.10 workstation I can add more details to my setup description (I am not sure what is relevant). The question Often (but not always) it takes long time for a web browser (Firefox) to open static web page served by Linux. I am sure it is not a performance issue. To be more specific: it takes about ~20 seconds to resolve(?) the address http://bridged for a web browser. Additionally I have just installed samba service and noticed similar problem, so it is not specific to browser & http. Initial access for samba shares also takes long time.

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• Optimal Networking Setup for a 2-Story unit?

  - by user29336

  I am moving into a 4 bedroom two-story unit. It’s roughly 2,200 sq ft. I want absolute max throughput possible to be achieved in all focal points. We’re all in internet related industries. Between gaming and web-development latency and throughput are major factors for us. Here’s our main focal points: 1) Garage (office). downstairs 2) Each bedroom x4. upstairs 3) Living room. downstairs The fastest line we can get is Comcast 50mbdown/5up (Wideband). I am looking for the best way to achieve wireless and wired performance for our setup. Our gaming computers may be in our bedroom, and we also may bring it down to the office every now and then for “LAN” sessions. Most wireless will be happening downstairs with our laptops, but since we may do LAN sessions then hard wired latency may be important there too. My concerns: If we do only wireless there would be too much latency for gaming. I don’t know if placing one D-link DGL 4500 on the top floor would be enough; which I currently own. (http://dlink.com/us/en/home-solutions/support/product/dgl-4500-xtreme-n-gaming-router) As far as I’m aware wireless signals transfer best top down. Would this wireless router be enough on top floor and that’s it? My second strategy was a combination of wiring and wireless but I’m not sure what’s easiest way to do this? This is a place we’re renting, so I’m not sure how much leeway we have with wiring, but we’re all pretty competent... if we can’t drill through a wall we can probably “stitch” them across the edges wherever needed. Thoughts on the optimal way to do this?

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• Representing server state with a metric

  - by Sal

  I'm using Microsoft's Performance Monitor to dump logs of RAM, CPU, network, and disk usage from multiple servers. I'd like to get a single metric that captures the state of a given variable to a good extent. For instance, disk usage is pretty stable, so if I take a single reading that says I have 50% remaining disk space, that reading will give me an accurate measure for the day. (The servers aren't doing heavy IO writing.) However, the tricky part here is monitoring CPU and network usage. The logs currently dump the % CPU usage every ten seconds. If I take a straight average of the numbers, it may not represent reality, as % CPU will be much lower during the night than day. (We host websites that sell appliance items.) I'd like to get an average over a span during peak hours (about 5 hours in the day) and present a daily peak hour metric. Of course, there are most likely some readings that will come in as overly spiked (if multiple users pinged the server at once) or no use (a momentary idle state). Is there a standard distribution/test industries use in these situation?

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• FreeBSD 8.1 unstable network connection

  - by frankcheong

  I have three FreeBSD 8.1 running on three different hardware and therefore consist of different network adapter as well (bce, bge and igb). I found that the network connection is kind of unstable which I have tried to scp some 10MB file and found that I cannot always get the files completed successfully. I have further checked with my network admin and he claim that the problem is being caused by the network driver which cannot support the load whereby he tried to ping using huge packet size (around 15k) and my server will drop packet consistently at a regular interval. I found that this statement may not be valid since the three server is using three different network drive and it would be quite impossible that the same problem is being caused by three different network adapter and thus different network driver. Since then I have tried to tune up the performance by playing around with the /etc/sysctl.conf figures with no luck. kern.ipc.somaxconn=1024 kern.ipc.shmall=3276800 kern.ipc.shmmax=1638400000 # Security net.inet.ip.redirect=0 net.inet.ip.sourceroute=0 net.inet.ip.accept_sourceroute=0 net.inet.icmp.maskrepl=0 net.inet.icmp.log_redirect=0 net.inet.icmp.drop_redirect=1 net.inet.tcp.drop_synfin=1 # Security net.inet.udp.blackhole=1 net.inet.tcp.blackhole=2 # Required by pf net.inet.ip.forwarding=1 #Network Performance Tuning kern.ipc.maxsockbuf=16777216 net.inet.tcp.rfc1323=1 net.inet.tcp.sendbuf_max=16777216 net.inet.tcp.recvbuf_max=16777216 # Setting specifically for 1 or even 10Gbps network net.local.stream.sendspace=262144 net.local.stream.recvspace=262144 net.inet.tcp.local_slowstart_flightsize=10 net.inet.tcp.nolocaltimewait=1 net.inet.tcp.mssdflt=1460 net.inet.tcp.sendbuf_auto=1 net.inet.tcp.sendbuf_inc=16384 net.inet.tcp.recvbuf_auto=1 net.inet.tcp.recvbuf_inc=524288 net.inet.tcp.sendspace=262144 net.inet.tcp.recvspace=262144 net.inet.udp.recvspace=262144 kern.ipc.maxsockbuf=16777216 kern.ipc.nmbclusters=32768 net.inet.tcp.delayed_ack=1 net.inet.tcp.delacktime=100 net.inet.tcp.slowstart_flightsize=179 net.inet.tcp.inflight.enable=1 net.inet.tcp.inflight.min=6144 # Reduce the cache size of slow start connection net.inet.tcp.hostcache.expire=1 Our network admin also claim that they see quite a lot of network up and down from their cisco switch log while I cannot find any up down message inside the dmesg. Have further checked the netstat -s but dont have concrete idea. tcp: 133695291 packets sent 39408539 data packets (3358837321 bytes) 61868 data packets (89472844 bytes) retransmitted 24 data packets unnecessarily retransmitted 0 resends initiated by MTU discovery 50756141 ack-only packets (2148 delayed) 0 URG only packets 0 window probe packets 4372385 window update packets 39781869 control packets 134898031 packets received 72339403 acks (for 3357601899 bytes) 190712 duplicate acks 0 acks for unsent data 59339201 packets (3647021974 bytes) received in-sequence 114 completely duplicate packets (135202 bytes) 27 old duplicate packets 0 packets with some dup. data (0 bytes duped) 42090 out-of-order packets (60817889 bytes) 0 packets (0 bytes) of data after window 0 window probes 3953896 window update packets 64181 packets received after close 0 discarded for bad checksums 0 discarded for bad header offset fields 0 discarded because packet too short 45192 discarded due to memory problems 19945391 connection requests 1323420 connection accepts 0 bad connection attempts 0 listen queue overflows 0 ignored RSTs in the windows 21133581 connections established (including accepts) 21268724 connections closed (including 32737 drops) 207874 connections updated cached RTT on close 207874 connections updated cached RTT variance on close 132439 connections updated cached ssthresh on close 42392 embryonic connections dropped 72339338 segments updated rtt (of 69477829 attempts) 390871 retransmit timeouts 0 connections dropped by rexmit timeout 0 persist timeouts 0 connections dropped by persist timeout 0 Connections (fin_wait_2) dropped because of timeout 13990 keepalive timeouts 2 keepalive probes sent 13988 connections dropped by keepalive 173044 correct ACK header predictions 36947371 correct data packet header predictions 1323420 syncache entries added 0 retransmitted 0 dupsyn 0 dropped 1323420 completed 0 bucket overflow 0 cache overflow 0 reset 0 stale 0 aborted 0 badack 0 unreach 0 zone failures 1323420 cookies sent 0 cookies received 1864 SACK recovery episodes 18005 segment rexmits in SACK recovery episodes 26066896 byte rexmits in SACK recovery episodes 147327 SACK options (SACK blocks) received 87473 SACK options (SACK blocks) sent 0 SACK scoreboard overflow 0 packets with ECN CE bit set 0 packets with ECN ECT(0) bit set 0 packets with ECN ECT(1) bit set 0 successful ECN handshakes 0 times ECN reduced the congestion window udp: 5141258 datagrams received 0 with incomplete header 0 with bad data length field 0 with bad checksum 1 with no checksum 0 dropped due to no socket 129616 broadcast/multicast datagrams undelivered 0 dropped due to full socket buffers 0 not for hashed pcb 5011642 delivered 5016050 datagrams output 0 times multicast source filter matched sctp: 0 input packets 0 datagrams 0 packets that had data 0 input SACK chunks 0 input DATA chunks 0 duplicate DATA chunks 0 input HB chunks 0 HB-ACK chunks 0 input ECNE chunks 0 input AUTH chunks 0 chunks missing AUTH 0 invalid HMAC ids received 0 invalid secret ids received 0 auth failed 0 fast path receives all one chunk 0 fast path multi-part data 0 output packets 0 output SACKs 0 output DATA chunks 0 retransmitted DATA chunks 0 fast retransmitted DATA chunks 0 FR's that happened more than once to same chunk 0 intput HB chunks 0 output ECNE chunks 0 output AUTH chunks 0 ip_output error counter Packet drop statistics: 0 from middle box 0 from end host 0 with data 0 non-data, non-endhost 0 non-endhost, bandwidth rep only 0 not enough for chunk header 0 not enough data to confirm 0 where process_chunk_drop said break 0 failed to find TSN 0 attempt reverse TSN lookup 0 e-host confirms zero-rwnd 0 midbox confirms no space 0 data did not match TSN 0 TSN's marked for Fast Retran Timeouts: 0 iterator timers fired 0 T3 data time outs 0 window probe (T3) timers fired 0 INIT timers fired 0 sack timers fired 0 shutdown timers fired 0 heartbeat timers fired 0 a cookie timeout fired 0 an endpoint changed its cookiesecret 0 PMTU timers fired 0 shutdown ack timers fired 0 shutdown guard timers fired 0 stream reset timers fired 0 early FR timers fired 0 an asconf timer fired 0 auto close timer fired 0 asoc free timers expired 0 inp free timers expired 0 packet shorter than header 0 checksum error 0 no endpoint for port 0 bad v-tag 0 bad SID 0 no memory 0 number of multiple FR in a RTT window 0 RFC813 allowed sending 0 RFC813 does not allow sending 0 times max burst prohibited sending 0 look ahead tells us no memory in interface 0 numbers of window probes sent 0 times an output error to clamp down on next user send 0 times sctp_senderrors were caused from a user 0 number of in data drops due to chunk limit reached 0 number of in data drops due to rwnd limit reached 0 times a ECN reduced the cwnd 0 used express lookup via vtag 0 collision in express lookup 0 times the sender ran dry of user data on primary 0 same for above 0 sacks the slow way 0 window update only sacks sent 0 sends with sinfo_flags !=0 0 unordered sends 0 sends with EOF flag set 0 sends with ABORT flag set 0 times protocol drain called 0 times we did a protocol drain 0 times recv was called with peek 0 cached chunks used 0 cached stream oq's used 0 unread messages abandonded by close 0 send burst avoidance, already max burst inflight to net 0 send cwnd full avoidance, already max burst inflight to net 0 number of map array over-runs via fwd-tsn's ip: 137814085 total packets received 0 bad header checksums 0 with size smaller than minimum 0 with data size < data length 0 with ip length > max ip packet size 0 with header length < data size 0 with data length < header length 0 with bad options 0 with incorrect version number 1200 fragments received 0 fragments dropped (dup or out of space) 0 fragments dropped after timeout 300 packets reassembled ok 137813009 packets for this host 530 packets for unknown/unsupported protocol 0 packets forwarded (0 packets fast forwarded) 61 packets not forwardable 0 packets received for unknown multicast group 0 redirects sent 137234598 packets sent from this host 0 packets sent with fabricated ip header 685307 output packets dropped due to no bufs, etc. 52 output packets discarded due to no route 300 output datagrams fragmented 1200 fragments created 0 datagrams that can't be fragmented 0 tunneling packets that can't find gif 0 datagrams with bad address in header icmp: 0 calls to icmp_error 0 errors not generated in response to an icmp message Output histogram: echo reply: 305 0 messages with bad code fields 0 messages less than the minimum length 0 messages with bad checksum 0 messages with bad length 0 multicast echo requests ignored 0 multicast timestamp requests ignored Input histogram: destination unreachable: 530 echo: 305 305 message responses generated 0 invalid return addresses 0 no return routes ICMP address mask responses are disabled igmp: 0 messages received 0 messages received with too few bytes 0 messages received with wrong TTL 0 messages received with bad checksum 0 V1/V2 membership queries received 0 V3 membership queries received 0 membership queries received with invalid field(s) 0 general queries received 0 group queries received 0 group-source queries received 0 group-source queries dropped 0 membership reports received 0 membership reports received with invalid field(s) 0 membership reports received for groups to which we belong 0 V3 reports received without Router Alert 0 membership reports sent arp: 376748 ARP requests sent 3207 ARP replies sent 245245 ARP requests received 80845 ARP replies received 326090 ARP packets received 267712 total packets dropped due to no ARP entry 108876 ARP entrys timed out 0 Duplicate IPs seen ip6: 2226633 total packets received 0 with size smaller than minimum 0 with data size < data length 0 with bad options 0 with incorrect version number 0 fragments received 0 fragments dropped (dup or out of space) 0 fragments dropped after timeout 0 fragments that exceeded limit 0 packets reassembled ok 2226633 packets for this host 0 packets forwarded 0 packets not forwardable 0 redirects sent 2226633 packets sent from this host 0 packets sent with fabricated ip header 0 output packets dropped due to no bufs, etc. 8 output packets discarded due to no route 0 output datagrams fragmented 0 fragments created 0 datagrams that can't be fragmented 0 packets that violated scope rules 0 multicast packets which we don't join Input histogram: UDP: 2226633 Mbuf statistics: 962679 one mbuf 1263954 one ext mbuf 0 two or more ext mbuf 0 packets whose headers are not continuous 0 tunneling packets that can't find gif 0 packets discarded because of too many headers 0 failures of source address selection Source addresses selection rule applied: icmp6: 0 calls to icmp6_error 0 errors not generated in response to an icmp6 message 0 errors not generated because of rate limitation 0 messages with bad code fields 0 messages < minimum length 0 bad checksums 0 messages with bad length Histogram of error messages to be generated: 0 no route 0 administratively prohibited 0 beyond scope 0 address unreachable 0 port unreachable 0 packet too big 0 time exceed transit 0 time exceed reassembly 0 erroneous header field 0 unrecognized next header 0 unrecognized option 0 redirect 0 unknown 0 message responses generated 0 messages with too many ND options 0 messages with bad ND options 0 bad neighbor solicitation messages 0 bad neighbor advertisement messages 0 bad router solicitation messages 0 bad router advertisement messages 0 bad redirect messages 0 path MTU changes rip6: 0 messages received 0 checksum calculations on inbound 0 messages with bad checksum 0 messages dropped due to no socket 0 multicast messages dropped due to no socket 0 messages dropped due to full socket buffers 0 delivered 0 datagrams output netstat -m 516/5124/5640 mbufs in use (current/cache/total) 512/1634/2146/32768 mbuf clusters in use (current/cache/total/max) 512/1536 mbuf+clusters out of packet secondary zone in use (current/cache) 0/1303/1303/12800 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) 1153K/9761K/10914K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/8/6656 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 0 requests for I/O initiated by sendfile 0 calls to protocol drain routines Anyone got an idea what might be the possible cause?

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