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• Count of memory copies in *nix systems between packet at NIC and user application?

  - by Michael_73

  Hi there, This is just a general question relating to some high-performance computing I've been wondering about. A certain low-latency messaging vendor speaks in its supporting documentation about using raw sockets to transfer the data directly from the network device to the user application and in so doing it speaks about reducing the messaging latency even further than it does anyway (in other admittedly carefully thought-out design decisions). My question is therefore to those that grok the networking stacks on Unix or Unix-like systems. How much difference are they likely to be able to realise using this method? Feel free to answer in terms of memory copies, numbers of whales rescued or areas the size of Wales ;) Their messaging is UDP-based, as I understand it, so there's no problem with establishing TCP connections etc. Any other points of interest on this topic would be gratefully thought about! Best wishes, Mike

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• Wordpress & Django -- One domain, two servers. Possible?

  - by DomoDomo

  My question is about hosting Django and Wordpress under one domain, but two physical machines (actually, they are VMs but same diff). Let's say I have a Django webapp at example.com. I'd like to start a Wordpress blog about my webapp, so any blog page rank mojo flows back to my webapp, I'd like the blog address t be example.com/blog. My understanding is blog.example.com would not transfer said page rank mojo. Because I'm worried about Wordpress security flaws compromising my Django webapp, I want to host Django and Wordpress on two physically separate machines. Given all that, is it possible using re-write rules or a reverse proxy server to do this? I know the easy way is to make my Wordpress blog a subdomain, but I really don't want to do that. Has anyone done this in the past, is it stable? If I need a third server to be a dedicated reverse proxy, that's totally fine. Thanks!

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• Is there a way to automate testing for a GNS3 network topology?

  - by Chedy2149

  I'm working on an MPLS backbone topology using GNS3, this topology includes configuration of several networking technologies such as IPv6, BGP, OSPF, IPv6 to IPv4 dynamic tunneling, MPLS based VPNs, MPLS based traffic engineering... So I'm a beginner with basic knowledge in networking (Ipv4 addressing, basic routing and switching) and I can't just easly test if my topology works or not, moreover fiddling with configuration I've noticed that sometimes when getting MPLS config right and missing BGP config all my topology is messed up. Given that I use Cisco 7200 series routers, is there any way to build a test harness for my topology in order to guarentee correctness with a single push button automated process?

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• two identical broadband lines working as one

  - by Katafalkas

  I have been trying to find an answer to this, but all I get is hobbyists trying to connect they linksys's and get some magic out of it. So I am thinking of a way I could combine two 100Mbp Fiber Optics lines into a single connection for our office. I assume it involves some CISCO learning or something like this. Was thinking that I might need to configure some big router to load-balance the NAT'ing in some way. I assume that meny of you have done something similar and maybe someone could share the knowledge or at least provide some tips ?

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• Is it possible to sync specific router settings across multiple routers?

  - by Betard Fooser

  I recently purchased a second Linksys wireless routers set up on the other side of my home and I am wondering if it is possible to somehow sync particular settings between the two? For instance what I am really after is the "MAC Filter List". I would "like" to be able to maintain the list on both routers without having to manually type in the field values. maybe this isn't possible, or has an easy answer, but hopefully those of you who know will cut me a bit of slack. I tried to "google" the answer to this of course, but it seems any searches with the words "sync" and "router" and/or "wifi" result in pages of people having issues with synching their iOS devices over wifi. I would say that have decent amount of networking knowledge in regards to average home networks, and I imagine in larger businesses / corporations they must have a "simpler" way of maintaining things like this. Any insight to point me in the right direction will be much appreciated.

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• Ubuntu server 11 showing weird characters on console

  - by andySF

  I've installed Ubuntu server 11 after my last hard drive failed to perform. The install process and GRUB screen are OK but I have a problem with the console. I attached two photos because it's difficult for me to describe this issue. I have little knowledge about Linux. My server is used for git, file server, print server. I played with this command dpkg-reconfigure console-setup but no effect. It's nothing physicality wrong with my display or my memory(it's on board). I have run a memtest, and besides that withe the previous version of Ubuntu I've had no problems. The problem.

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• Multiple EyeFinity Display groups

  - by Shinrai

  Is it possible with an EyeFinity enabled card to make multiple display groups at once? I was playing with a FirePro 2460 and while a 4x1 or 2x2 display group works quite nicely, if I make a 2x1 display group and then select one of the other displays to try to make a second 2x1 display group, it disables the first one. Is there any way to circumvent this behavior and set up two separate spans on the same card? Additionally, can you set up distinct display groups if they're on different cards? I will have the opportunity to test several of these cards in one machine very shortly, but I'm curious if anyone has any experience. EDIT: I can confirm that you can make multiple spans on multiple cards (as long as they don't cross cards, obviously) (If the answers are different for FirePro/FireMV cards and Radeon cards, that is helpful and relevant knowledge - I doubt it, though.)

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• transferring subversion changes between linux and windows

  - by andreas buykx

  Hi all, What is the best way to transfer changes that include new and deleted directories and/or new and deleted (actually moved) files in those directories from a subversion repository on linux to windows? I do my developments on linux using a subversion repository, but I have to test my changes on windows as well. My windows machine has a tortoisesvn repository which I tried to patch with a svn diff output. This failed miserably since my patch contains a renamed (i.e. deleted and added under a different name) directory, a new directory and the files in there. Do I do things wrong by just applying the svn diff output as a patch in tortoisesvn? For now I think that my best option is to have the windows tree on the same svn version as the linux tree and just copy the entire changed directory over the existing directory. Would that work?

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• DVD stops working in windows 7 64 bit

  - by Skadlig

  I have the same problem as described in this question: http://superuser.com/questions/105928/dvd-cd-rom-drives-stop-working-in-windows-7 I know I have got some games that are using starforce and/or securerom. What I don't have is the upper and lower filter in my registry tag. Oh and a reboot temporarily fixes my problem. After a random time though it goes missing again. I found a Microsoft knowledge base article regarding this but since I didn't have the filter tags they couldn't help me. Does anyone have any other tips bar removing the despicable drm:s? I would like to go on playing my games so that is not really an option for me.

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• What should I know before considering a VPS or dedicated server?

  - by Corey Sarnia

  I have a plan for the future for an application and web service. The client will have an application that will send requests to a server-side Java back-end that will process requests, and the server should also be able to host a website, preferably on a WAMP setup (which is what I'm used to; very little *nix knowledge). Now, I cannot provide any hard stats because this is only a plan that's in a discussion stage. However, we do fully expect it will scale enough to need some type of dedicated hosting. My question is this: what types of things should I know about before looking into getting hosting? What should I be asking the hosting providers before I decide on a purchase? When is it appropriate to switch from a VPS to a fully dedicated server?

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• Windows 7: This notification icon is currently not active

  - by icelava

  Some time this week, without any major change done to one of my x64 Windows 7 computers, the Media eject icon goes missing in the systray taskbar area. When I attempt to reset the notification settings, i see this "This notification icon is currently not active" info warning Initially KB945011 managed to restore the icon after a reboot. But now it appears to have disappeared again. It seems to have disappeared (cannot really confirm) after I unlock the physical logon session (which was previously rerouted to a virtual Remote Desktop session). Anybody have knowledge on possible causes to this missing behaviour? UPDATE 1 Feb 11 It seems that happens often when I remote desktop to the computer, I see it from the remote screen, but when i unlock the screen physically, it disappears. It would reappear when I connect to remote desktop again. Hmmmmm.

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• Mac firewall blocking nginx (port 80) from external side

  - by Alex Ionescu

  I installed nginx using ports and started it with sudo. Accessing the nginx welcome page from localhost works perfectly, however accessing it from an external computer fails. Doing an nmap on the computer from the outside reveals 80/tcp filtered http So clearly the mac firewall is blocking the port. I then proceed to add the nginx executable to the firewall exception list as seen in this image, however the nmap still shows up as port 80 being filtered and I'm unable to access the webpage. The exact binary that is in the list is /opt/local/sbin/nginx which to my knowledge seems correct Any ideas what I should do? Thanks! P.S. Turning the firewall off does allow me to access the website from the outside world, however that isn't an ideal solution.

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• Why does my iTunes use so much CPU time?

  - by bikesandcode

  I have a roughly 2 year old Macbook (10.5). I have iTunes 10. When iTunes is playing MP3s, I see CPU usage of the iTunes process in the system monitor ranging from 65%-75%. When I pause the music, I see CPU usage of about 65%-75%. I do not have any visualisations going, to my knowledge I have not turned on any CPU destroying features, my music library isn't tiny, but it's hardly huge (3GB). This is mildly annoying when I'm plugged into the wall as I only have slightly longer compile times, but if I am out and about, this is a major drain on the battery. Using VLC I see CPU loads of ~= 10% at the most when listening to music and generally lower. What the heck is iTunes doing?

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• Data in column not changed

  - by shanks

  I have sql 2005 and when i run below query, data from RealTimeLog table transfer to History but when new data come in RealTimeLog table old data not changed by new one means OutTime data is not changed with new data from RealTimeLog. insert into History (UserID,UserName,LogDate, [InTime], [OutTime]) SELECT UserID,UserName,[LogDate],CONVERT(nvarchar,MIN(CONVERT(datetime, [LogTime], 108)), 108), CONVERT(nvarchar, MAX(CONVERT(datetime, [LogTime], 108)), 108) From RealTimeLog where not Exists (select * from History H Where H.UserID = RealTimeLog.UserID AND H.UserName=RealTimeLog.UserName AND H.LogDate=RealTimeLog.LogDate) GROUP BY UserID,UserName,[LogDate] ORDER BY UserID,[LogDate] for ex. 1 Shanks 02/05/2010 9:00 10:00 if new Max time generated suppose 11:00 in RealtimeLog then it is not inserted in History table and output remain same as above.

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• What can impact the throughput rate at tcp or Os level?

  - by Jimm

  I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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• How do I make YouTube videos fill up an entire screen when using dual monitors?

  - by Jephir

  I am using a dual monitor setup on Ubuntu 9.10 using the TwinView configuration in NIVIDA X Server Settings. My total resolution is 2960x1050 pixels, and my individual monitors are 1680x1050 (primary) and 1280x1024 (secondary). When going into fullscreen mode on any video on YouTube, I only see a cropped version of the video on my primary display as seen below. This does not occur on any other video sharing website - they properly make the video to fill the entire screen on my primary monitor. To my knowledge this problem only happens on YouTube.

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• Easy way to replicate web page across machines?

  - by Mike_G

  I am trying to replicate a browser page to another browser on another machine. I basically want to reproduce a page exactly how it appears to a customer for viewing by the website owner. I have done this before using some impersonation trickery, but found that it would throw the session state out of wack when the site owner would switch customers. So I would like to stay away from cookie and authentication manipulation. Anybody done anything like that? Is there a way to easily transfer the DOM to a webservice? The tech/programming at my disposal are C#, javascript, WCF.

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• Cannot fix induced 0x7b error on XP

  - by Malfist

  I'm writing a tool that will automagically fix the STOP 0x7B error that occurs when windows cannot access the hard drive due to driver issues (usually). I've wrote a tool that does everything the Knowledge Base article says to do. But it's not working. I'm inducing the issue by changing the bios SATA controller to AHCI, then moving it to another computer and updating it's registry. When I move it back to the other computer, nothing new happens. Can someone tell me what more I need to do?

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• How to elegantly selectively exclude FreeBSD network traffic from OpenVPN interface by port

  - by Polygonica

  inexperienced sysadmin here. I'm planning on running a net daemon inside a FreeBSD jail through OpenVPN, but want to be able to SSH directly into the jail and use the daemon's web interface daemon without going through the VPN. As I understand it, an OpenVPN tunnel is normally set up as a default virtual internet interface, and so incoming traffic will go out on the OpenVPN interface by default (which is problematic, as this incurs latency). I thought "well, obviously, since all of this traffic is leaving on a handful of ports, I'll just redirect those to the non-VPN gateway." I've tried to look for solutions, but almost all of them involve iptables instead of ipfw (which is default for FreeBSD) and solve slightly different problems. And alternate solutions like using multiple default routes to ensure that incoming traffic on any interface is always sent out on the same interface seem far-reaching and require deep knowledge of all tools involved. Is there an elegant way of ensuring that traffic leaving on specific ports exits on a specified non-default interface using ipfw?

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• What is the difference between remote procedure call and web service

  - by xiao

  Is there any clear definition about RPC and Web Service? A quick wikipedia search shows: RPC: Remote procedure call (RPC) is an Inter-process communication technology that allows a computer program to cause a subroutine or procedure to execute in another address space (commonly on another computer on a shared network) without the programmer explicitly coding the details for this remote interaction. Web Service: Web services are typically application programming interfaces (API) or web APIs that are accessed via Hypertext Transfer Protocol and executed on a remote system hosting the requested services. Web services tend to fall into one of two camps: Big Web Services[1] and RESTful Web Services. I am not quite clear what the real difference between the two things. It seems that one thing could belongs to RPC and is kind of web service at the same time. Is Web Service a higher level representation of RPC?

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• php code for geeting paramenter and image from the post request

  - by abdulsamad

  Hi all can any one guide me how to get parameter specially image from the given post request. --0xKhTmLbOuNdArY Content-Disposition: form-data; name="source" lighttable --0xKhTmLbOuNdArY Content-Disposition: form-data; name="title" Google (The top search engine). --0xKhTmLbOuNdArY Content-Disposition: form-data; name="isbn" 9780077282073 --0xKhTmLbOuNdArY Content-Disposition: form-data; name="price" 5 --0xKhTmLbOuNdArY Content-Disposition: form-data; name="condition" Execlent --0xKhTmLbOuNdArY Content-Disposition: form-data; name="media" Content-Type: image/jpg Content-Transfer-Encoding: binary ÿØÿà NoTE:: ÿØÿà is the image in that request.

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• Simple mail server setup for a user-based website.

  - by Absolute0

  I am working on a simple website that has user registration. All I need to do is confirm email addresses by emailing a confirmation email and maybe send out periodic emails regarding various information. I am also considering having a [email protected] email for user questions and comments. The application is written in django and I am running it on ArchLinux on a VPS. I have no knowledge of mail servers. I tried setting up postfix and qmail but had no luck. They are complicated and require a lot of configuration to get them working properly. My use case is super simple and doesn't not require anything fancy. Is there any simple mailing setup that will enable me to quickly get emailing working with my django app with minimal work?

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• Is the time cost constant when bulk inserting data into an indexed table?

  - by SiLent SoNG

  I have created an archive table which will store data for selecting only. Daily there will be a program to transfer a batch of records into the archive table. There are several columns which are indexed; while others are not. I am concerned with time cost per batch insertion: - 1st batch insertion: N1 - 2nd batch insertion: N2 - 3rd batch insertion: N3 The question is: will N1, N2, and N3 roughly be the same, or N3 N2 N1? That is, will the time cost be a constant or incremental, with existence of several indexes? All indexes are non-clustered. The archive table structure is this: create table document ( doc_id int unsigned primary key, owner_id int, -- indexed title smalltext, country char(2), year year(4), time datetime, key ix_owner(owner_id) }

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• trouble loggin into a Mac share from a Windows PC on the network

  - by villares

  I have this mixed network and usually log into the Macs from the Windows XP home machines and vice versa. I have no real networking knowledge, things just seem to work, more or less, with the default settings. Now I've got a new Snow Leopard Mac with a shared folder (added the user names of the Windows users at the sharing preferences) and the trouble is some machines can open the share and others can't. I can't see the difference. It feels like some Windows machines have a "cache" and won't ask for the share password, just deny access. I can also see old shares proposed at the Windows "add network place wizard".

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• NATing with a single-homed machine possible?

  - by Harry

  I have the following setup: a) a single-homed machine, A, that can see the Internet. b) other machines B, C, and D that cannot see the Internet. c) A, B, C, and D can see each other. d) all machines are running either RHEL 5.3 or Fedora 16. Question: Is it possible to have B, C, and D share the Internet connection with A somehow? Note, again, that machine A does not have a second NIC installed. (The solutions that I am finding on the Net assume A to be a dual-homed system!) Also, could you please recommend a set of book(s) or online resources for a current and in-depth coverage of iptables for people with only a basic knowledge of TCP/IP?

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