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  • How to Monitor Network in Medium-Sized Company?

    - by Kyle Lowry
    I work at a medium sized company (100+ employees). An issue that has been cropping up is network performance, internet access in particular. We have about 70 or more computers, a mix of Mac OS X and Windows XP & 7 machines. We have several servers (Exchange server, PC file servers, MS SQL, Blackberry, FTP, Mac server, etc). There are four main switches, a SonicWall firewall, and probably a couple routers in the server room with a dozen or so more scattered around the building. The network structure has grown organically over a number of years; and, as far as I know, there really isn't a monitoring solution in place. When we experience network issues (slow connections, dropped packets, and so on), our general solution is to power cycle some hardware or go around to each employee and ask them if they are uploading/downloading any large files. This is really inefficient and time consuming, and it does not allow us to monitor the network, tackling potential problems proactively. I would like to find a solution that would allow me to monitor network usage company-wide in real time, with detail going down to the individual computer, ideally. Given the hodgepodge of equipment and operating systems, what would be the best way to set up some kind of monitoring solution? Hardware, software, restructuring our network architecture?

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  • Using multiple USB webcams in Linux

    - by rachelderp
    Running more than one USB webcam in Debian/Linux results in the the following error: libv4l2: error turning on stream: No space left on device VIDIOC_STREAMON: No space left on device What initially seemed to be a programming issue in OpenCV turned into a quest for a mysterious hardware/software problem after the same errors were produced by running cheese and xawtv. Apparently it's caused by webcams requesting all the available bandwidth on the USB host controller. With that in mind I decided to run wireshark and capinfos to see just how much bandwidth a single camera used. 4 megabits per second at 320x240 14 megabits per second at 640x480 32 megabits per second at 1920x1080 Interesting! That might explain why two cameras at 320x240 work but any higher resolution fails. It's as if my USB controller is only operating at USB 1 speeds, yet lsusb shows both webcams belonging to a device which supposedly supports 480 megabits per second. One solution proposed forcing the webcams to calculate their bandwidth usage instead of requesting their maximum by running the following commands: sudo rmmod uvcvideo sudo modprobe uvcvideo quirks=128 Unfortunately that made no difference, so I decided to try another solution. A post on StackOverflow suggested telling my webcams to use a lower FPS or compressed video format like MJPEG, but after running v4lctl list it doesn't appear either of my webcams support changing their video mode. And that's where I'm stuck. Why would two webcams operating well below the maximum speed of USB 2 would produce this error? ps: It's not a disk space issue, df displays no change when the webcams are started. pps: If it makes a difference, here's the output of lsusb

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  • What is the best hosting option for Flash web-widget?

    - by par
    Our Flash web-widget has got highly popular. It is downloaded around 100,000 times per day. And that is the problem. Our server bandwidth is too narrow to deliver the widget to the clients fast. The widget is loaded very slow. Probably 20 times slower than before (at peak times). Probably I have choosen not the right hoster for my task - delivering 1 MB Flash widget to 100,000 users per day. What is the best hosting solution in my case? I'm not good at server administration so forgive me if I sound naive. The details are the following. Our hoster options: -Dedicated server, Ubuntu -10 Mbit Connection -monthly bandwidth limit: 2000 GB Widget size is 1 MB. The widget consists of the main SWF and a number of loaded SWF and data files. This is a part of Apache Status report taken right now ---- Server uptime: 1 hour 2 minutes 38 seconds Total accesses: 74865 - Total Traffic: 5.8 GB CPU Usage: u28 s7.78 cu0 cs0 - .952% CPU load 19.9 requests/sec - 1.6 MB/second - 81.1 kB/request 200 requests currently being processed, 0 idle workers WWWWWWWWWWWWWWWWWWWWWWWWCWWWWWWWWWWWWWWWWWWWWWWWWWWCWWWWWWWCWWWW WWWWWCWWWWWWWWWWWWWWCWWWWWWWWWWWWCWWWWWWWWCWWCWWWWWWWWWWWWWWWWWW WWWWWWWWWWWWWWWWCWWWWWWWWWWWWWWWWWWWWWWWWWWWCWCWWWWWWWWWWWWWWWCW WWWWWWWW........................................................ ----

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  • Ubuntu + LigHTTPd: Server requests taking ages

    - by ctrl_freak
    I've had an issue since upgrading my distro a couple of weeks ago from hardy; receiving data after making a request has increasing intervals of nothing, as you can see from the picture below. http://i49.tinypic.com/2w5lvr9.png I have since reinstalled fresh from an Ubuntu 10.04 Server (i386) disk, but am still having the same issues. I'm running on a LigHTTPd, MySQL, PHP5 stack. The surprising thing is, that local browsing using lynx is super fast, as expected. Initially, after reinstalling, I copied over the old configuration files from the previous installation, but have since reinstalled LigHTTPd and rebuilt the config file from scratch. The only correlation I could find, was that I attempted installation of ionCube and Zend Optimizer for a script I was testing, however I would think that it could no longer impact seeing I had reinstalled the OS. I have also removed Suhosin just in case, however it had no impact. I'm thinking it possibly has something to do with networking, but I wouldn't know where to start. The server is manually assigned an IP by it's MAC address on the router. The fact that the time seems to be exponential (to a point) worries me. I've tried strace'ing the LigHTTPd and MySQL processes, however I couldn't see anything obvious, not that I'd really know what I'm looking for. RAM and CPU usage don't seem to be out of the ordinary, but I can't say its perfect.. I'm hoping someone has experienced the same, or can point me in a direction, as searching has proved fruitless as I don't know anything specific. Config files can be posted, if requested.

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  • SBS 2008 Sharepoint Database good Memory Limit.

    - by ldelgado
    I manage a small network running on Small Business Server 2008. Lately, the Sharepoint embedded database is getting out of control with its memory usage. I've got a total of 16 GB of RAM on this server, and the Sharepoint database sometimes uses almost 8 GB of RAM. This never happened before, and it started happening after I installed Backup Exec 2010. It happens after a backup is performed. So I suspect there is a memory leak involved. I am working on that issue, but this question isn't about that. I would like to limit the amount of memory the Embedded database uses. I know how to do it. My question is, what would be the ideal amount of memory that I can allocate to Sharepoint? There are only 4 users on my network. One of the users uses two computers but not at the same time. They use sharepoint for a company calendar, and sometimes they share files that way also. Let me know if you need to know anything else. Thanks,

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  • Amazon EC2 - Free memory

    - by Damo
    We have an amazon ec2 small instance running and over the past few days we noticed that the memory is going down and down. On the small instance, we are running apache and tomcat6 Tomcat is started with the following JVM parameters -Xms32m -Xmx128m -XX:PermSize=128m -XX:MaxPermSize=256m We use nagios to monitor stuff like updates to apply, free disk space and memory. Everything else is behaving as expected but our memory is going down all the time. Our app receives approx half a million hits a day When I shutdown apache and tomcat, and ran free -m, we had only 594mb of memory free out out of the 1.7gb of memory. Not much else is running on the small instance and when running the top command I cannot see where the memory is going. The app we run on tomcat is a grails webapp. Could there be a possibility that there is a memory leak within our application? I read online and folks say that a small amazon instance is perfect for running apach and tomcat. I found a few posts online that showed how to setup apache and tomcat to limit the memory usage and I have already performed those steps. The memory is not being used up as quick but the memory is still decreasing over time. We have other amazone ec2 small instances running grails apps and the memory is fairly standard on those nodes. But they would not be receiving as much traffic Just to add, when I run the top command on the problem server, I cannot see where all the memory is being used Any help with this is greatly appreciated The output of free -m when run on my server is as follows total used free shared buffers cached Mem: 1657 1380 277 0 158 773 -/+ buffers/cache: 447 1209 Swap: 895 0 895 In your opinion, does this look ok? At what stage would the OS give back memory, would it wait to the memory reaches 0% or is this OS dependent?

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  • Configuring SQL Server Express 2005

    - by MrTognio
    What's the proper way to configure SQL Server Express 2005 so that it can allow for a number of clients to get connected to the server? I have my application running both in the server machine and the client machines. Given the nature of my application, clients are the branches geographically distant from each other, and the server itself. Every operation the client records must be reported to the server, because the server needs total control over the usage and production. But, what should I consider when configuring the connection in both sides, the server and the client? I'm not as used to SQL Server, I'm a beginner, however through SQL Server Configuration Manager I have set the main options without success. The problem seems to be related to trusted connections even though I have set it to support both windows and SQL Server authentication. When the client tries to connect to the server using windows authentication it displays no table; when it tries to communicate using a password (SQL Server authentication), tables are successfully displayed but no access is allowed... Thanx in advance!

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  • Losing SQL connections

    - by john pavelka
    sql servr 2005 - Standard; one dedicated sql server (VM); windows server 2003; Small databases; About once a week we lose all sql connections. It seems to fix itself after about 5-10 minutes. System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. --- System.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. We don't have a fully qualified DBA; it's kind of a joint effort here. Can somebody give me some general ideas for troubleshooting the network side and the application side? We already ran a few tuning profiles and ran through Database Tuning Advisor to apply indexing recommendations. It would sure be nice if there was a way to take a snapshot of what was running on sql server when these 100% cpu spikes occured, but sometimes we're not around. Is it common to throttle CPU for certain processes? Can this be done with Windows server 2003? For example, if security apps were making cpu spike to 100%, is there a way to limit their cpu usage? Any advice is appreciated. thanks,

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  • Limited bandwidth and transfer rates per user.

    - by Cx03
    I searched for a while but couldn't find anything concrete, hopefully someone can help me. I'm going to be running a Debian server on a gigabit port, and want to give each user his/her fair share of internet access. The first objective is easy - transfer rates (speed) per user. From what I've looked at, IPTables/Shorewall could do the job easy. Is this easy to setup, or could one of you point me at a config? I was hoping to limit users at 300mbit or 650mbit each. The second objective gets complicated. Due to the usage of the boxes, most of the traffic will be internal network traffic that does NOT get counted to the quota. However, I still need to limit the external traffic, and if they go over, cut off access (or throttle traffic to a very low speed (10mbit?)). Let's say the user has a 3TB external traffic limit. The IF part is: If the hostname they are exchanging the traffic with DOES NOT MATCH .ovh. or .kimsufi. (company owns multiple TLDs), count to the quota. Once said quota exceeds 3TB, choke them. Where could I find a system to count that for me? It would also need to reset or be able to be manually reset on a monthly basis. Thanks ahead of time!

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  • Ubuntu's garbage collection cron job for PHP sessions takes 25 minutes to run, why?

    - by Lamah
    Ubuntu has a cron job set up which looks for and deletes old PHP sessions: # Look for and purge old sessions every 30 minutes 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] \ && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 \ -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir \ fuser -s {} 2> /dev/null \; -delete My problem is that this process is taking a very long time to run, with lots of disk IO. Here's my CPU usage graph: The cleanup running is represented by the teal spikes. At the beginning of the period, PHP's cleanup jobs were scheduled at the default 09 and 39 minutes times. At 15:00 I removed the 39 minute time from cron, so a cleanup job twice the size runs half as often (you can see the peaks get twice as wide and half as frequent). Here are the corresponding graphs for IO time: And disk operations: At the peak where there were about 14,000 sessions active, the cleanup can be seen to run for a full 25 minutes, apparently using 100% of one core of the CPU and what seems to be 100% of the disk IO for the entire period. Why is it so resource intensive? An ls of the session directory /var/lib/php5 takes just a fraction of a second. So why does it take a full 25 minutes to trim old sessions? Is there anything I can do to speed this up? The filesystem for this device is currently ext4, running on Ubuntu Precise 12.04 64-bit. EDIT: I suspect that the load is due to the unusual process "fuser" (since I expect a simple rm to be a damn sight faster than the performance I'm seeing). I'm going to remove the use of fuser and see what happens.

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  • Failed Software RAID0 on Linux - Attempting to recover data

    - by Gizmo_the_Great
    I have a two disk RAID0 software raid (not hardware raid) that is reported to have failed during boot and my OS won't start. Using a Live CD, I get the following output : sudo mdadm -E /dev/sdc1 /dev/sdd1 /dev/sdc1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 3710713d:fb301031:84b61247:d1d53e0f Name : HP-xw9300:0 Creation Time : Sun Sep 1 15:22:26 2013 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 1465145328 (698.64 GiB 750.15 GB) Data Offset : 16 sectors Super Offset : 8 sectors State : active Device UUID : ad427cd2:9f885f57:7f41015f:90f8f6af Update Time : Sun Jun 8 12:35:11 2014 Checksum : a37407ff - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) /dev/sdd1: Magic : a92b4efc Version : 1.2 Feature Map : 0x0 Array UUID : 3710713d:fb301031:84b61247:d1d53e0f Name : HP-xw9300:0 Creation Time : Sun Sep 1 15:22:26 2013 Raid Level : -unknown- Raid Devices : 0 Avail Dev Size : 976771056 (465.76 GiB 500.11 GB) Data Offset : 16 sectors Super Offset : 8 sectors State : active Device UUID : 2ea0199d:cb08d9e7:0830448a:a1e1e348 Update Time : Sun Jun 8 13:06:19 2014 Checksum : 8883c492 - correct Events : 1 Device Role : spare Array State : ('A' == active, '.' == missing) GParted lists both disks, detects the flags as 'Raid' and lists the data usage. Can anyone please help me re-assemble just so that I can copy some of the data off that I have not backed up recently? Thanks

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  • Protocol (or service publish/discovery) to detect devices in network

    - by Gobliins
    we connect some embedded devices in a network. What i am looking for now, is a way to find the devices IP and identify them. We work with Windows PC´s and i am about to write a C# tool that should do this. I thought about send a udp broadcast and in the ack i.e. is the device´s ip, which would mean the device needs a daemon runnig to assign an ip itself. Running a service (like a printer) on the device, and on the PC just lookup for the service. I read about some things like apipa, zeroconf, ipv4 local link, bonjour, dns-sd, mdns, bonjour; They can automatically assign ip´s and publish services in a network. My Question is, can someone recommend me what would be good for my task? -The protocol or Service should be low on ressource (memory/cpu usage) use. -Are there some standard protocolls to use? -Is DNS a good idea or would it be to ressource consumpting just for finding a device´s IP? -Should also work when no dhcp servers are around. edit: To clarify a bit: The IP configuration is automatic. The problem to focus is how to tell the PC which IP in the network (or a direct connection in this vase there would only be one) belongs to the device (identity).

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  • Determining how all memory is used in Windows Server 2008

    - by Mojah
    Hi, I have a Windows Server 2008 system, which has 12GB of RAM. If I list all processes in the Task Manager, and SUM() the memory of each process (Working Set, Memory (Private Working Set), Commit Size, ...), I never reach more than 4-5GB that should be "in use". However, task manager reports this server has 11GB in use via the "Performance" tab. I'm failing in determining where all that used RAM is going. It doesn't seem to be system cache, but I can not be sure. It might be a memory leak in one of the appliances, but I'm struggling to find out which one. The server's memory keeps filing up, and eventually forces us to reboot the device to clear it. I've been reading up on how RAM assignments work on Windows Server: RAM, Virtual Memory, Pagefile and all that stuff: http://support.microsoft.com/kb/2267427 What's the best way to measure? http://www.zdnet.com/blog/bott/windows-7-memory-usage-whats-the-best-way-to-measure/1786 Configure the file system cache in Windows: http://smallvoid.com/article/winnt-system-cache.html But I fear I'm stuck without ideas at the moment.

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  • Laptop freezing every few seconds, including screen + sound

    - by zenstealth
    Just a few days ago, my Windows 7 HP dv4170us (1.76Ghz CPU, 1GB Ram) laptop started to freeze every other second where everything on screen and and sound (such as a song playing in iTunes) would just freeze until I bash it violently (without actually breaking the laptop) or wait for a couple of more seconds. I think it started one night when I noticed that a USB mouse of mine stopped working, and it displayed random "Device was not recognized" errors. I just unplugged the mouse and ignored it. Skip forward to the next day, is started freezing, and as of today I can't get my computer to not keep freezing. I tried to backup my files onto an external hdd, but it almost corrupted the drive. I ran 4 complete virus scans using MSSE and MalwareBytes (both quick and full scans), and they all came up clean. In the Task manager, the CPU usage is on a constant max, and so is the RAM (if I have just a few apps running, I only have like 30Mb of free RAM left). Also, on the outside of my laptop, right above where the CPU is located, it's very, very hot. I suspect that something is wrong internally within inside of the computer, but I'm not sure. It also does the same thing when booted into Ubuntu.Does anyone know what could be wrong with it?

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  • Out of memory errors but not actually out of memory...

    - by commradepolski
    So, myself and my fellow support techs have been fighting with this issue and we still dont know what the problem is. Lets start off with the system specs: Windows XP 32 bit Corporate (SP2 and SP3) Intel D975XBX2 Mobo 4gb of ram Intel Core 2 Quad Q6600 ATI Radeon HD 3600 - 512mb After a few hours of working on the machine, the end user will begin to see the following symptoms: Out of memory messages Title bars and menus dont draw in properly Problems accessing network resources Problems opening up documents such as MSWord and MSPowerpoint and text files Problems opening up explorer windows General instability We have looked at task manager while this issue was occurring, and all indicators, like PF usage, threads, handles, etc. are normal. We have been having trouble pinpointing the root cause of this issue. It is also not situated with one user, it affects 8-10. So far we have tried: Resetting CMOS (Waiting to see results) Replacing video card (didnt help) Windows updates (didnt help) Updating network drivers (didnt help) Switching user from 1gbps to 100mbps network connection (awaiting results) Swapping the affected user's hardware (waiting for results) Increasing desktop heap size (helped for a bit but then the issue became more frequent) Applying the /3 switch to XP (didnt help) Increasing and decreasing and setting PF to system managed state (didnt help) We did have a power outage at the office a couple weeks ago, and all these issues became more frequent. Prior to the power outage it may take a week or so for the users to experience the issues but since the power outage it takes 3-4 hours or less. We havent had reports of the above issues causing BSODs, although that would be easier to diagnose :). Any help is greatly appreciated.

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  • Identifying test machines in analytics logs

    - by RTigger
    We're just beginning to add analytics to our SaaS application, to begin (among other things) billing clients based on usage. The problem we're running into is there's a few circumstances where our support team will simulate a log in into production to try to reproduce reported issues with a client's configuration. When they log in, an entry will be made into our analytics logs that their specific account has logged in, which we use to calculate billing. A few ideas we had to solve this: 1) We log IP addresses as well as machine keys for each PC that logs in - we could filter out known IP addresses and/or machine keys belonging to support. The drawback is we have to maintain a list of keys / addresses manually. 2) If support (or anyone else internal) runs our application in debug mode (as opposed to release), it will not report analytics. This is fine, as long as support / anyone else remembers to switch to debug mode. 3) Include some sort of reg key / similar setting required to be set when configuring a production system in order to send analytics. Again, fine, as long as our infrastructure team remembers to set the reg key or setting. All of these approaches require some sort of human involvement, which we all know can be iffy at best. Has anyone run into a similar situation? Is there an automated approach to this problem? (PS Of course, we shouldn't be testing in production, but there are a few one-off instances with customer set up that we can't reproduce without logging in as them in production. This is the only time we do so, and this is the case I'm talking about in this question.)

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  • running a laptop continuously

    - by intuited
    I have an experienced laptop — a Dell Latitude D400, with a Pentium M CPU — that I'd like to run as an always-on server. This model was launched in 2004; I got mine second-hand in about 2007. I've heard that continuous operation is generally not a good idea with consumer hardware, but am lacking in specific knowledge about related problems, and have little idea of how much such usage patterns would reduce the lifespan of the machine. I'm mostly concerned with the unit's core components; parts such as the hard drive which are readily replaceable are, well, readily replaceable. What sorts of things can I do to increase the lifespan of this machine under such circumstances? For example, I'm guessing that it would be wise to limit the CPU frequency or take other steps to keep the internal temperature low. However, I'm not sure where the point of diminishing returns would lie with such an approach — 50°C? 40°C? Would it be useful to suspend the machine periodically, for perhaps an hour each day, or a few hours each week?

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  • Connections to IIS sometimes get stuck in CLOSE_WAIT state

    - by randomhuman
    Our application includes an ASP.Net web service that only needs to deal with a handful of clients. As such, the 10 incoming connection limit of Windows XP Pro is generally not a problem. However, on one particular server, connections are occasionally becoming stuck in the CLOSE_WAIT state. These connections build up over time and eventually new client connections are refused because the maximum number of connections are used up. From my googling it sounds like a failure of the webservice to properly close the connection can cause this problem, but as it works just fine on hundreds of other Windows XP pro machines I can't see it being a bug in our code. It also ran fine on the affected machine until some shenanigans on the part of the end user (I think they set about deleting duplicate files in order to reduce their disk usage, but they did not exactly come clean about it). What could the user have changed to introduce this problem? Is there any way I can force connections that are in CLOSE_WAIT to time out rather than letting them hang around? I have seen suggestions to reduce TcpTimedWaitDelay, but that only relates to the TIME_WAIT state, and changing it did not have any effect.

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  • Determining how all memory is used in Windows Server 2008

    - by Mojah
    I have a Windows Server 2008 system, which has 12GB of RAM. If I list all processes in the Task Manager, and SUM() the memory of each process (Working Set, Memory (Private Working Set), Commit Size, ...), I never reach more than 4-5GB that should be "in use". However, task manager reports this server has 11GB in use via the "Performance" tab. I'm failing in determining where all that used RAM is going. It doesn't seem to be system cache, but I can not be sure. It might be a memory leak in one of the appliances, but I'm struggling to find out which one. The server's memory keeps filing up, and eventually forces us to reboot the device to clear it. I've been reading up on how RAM assignments work on Windows Server: RAM, Virtual Memory, Pagefile and all that stuff: http://support.microsoft.com/kb/2267427 What's the best way to measure? http://www.zdnet.com/blog/bott/windows-7-memory-usage-whats-the-best-way-to-measure/1786 Configure the file system cache in Windows: http://smallvoid.com/article/winnt-system-cache.html But I fear I'm stuck without ideas at the moment.

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  • How to backup Servers to an SSH-Host with low traffic and access to versions and encryption?

    - by leto
    Hello, I've not run backups for the past dont't remember anymore years for my personal stuff until waking up lately and realising contrary to my prior belief: Actually. I care! :) Now I have a central data server at home where I want to attach an external media to, to which I want to save backups of my most important stuff, like years of self-written scripts, database dumps, you name it. I've tinkered with rsync+ssh over the last two years, also tried tar over ssh, but don't know the simplest and most easy to maintain way to do it yet. Heres my workload: A typical LAMP-Server (<5GB Data) which I'd like to backup fully so lots of small files connected via 10Mbit My personal stuff (<750GB Data) from a Mac connected via GE My passwords in an encrypted container (100Mb) from OpenBSD connected via serial-PPP My E-Mail from the last ten years (<25GB) as Maildir which I need to keep in readable format Some archives (tar.*) which I need to backup only once and keep in readable format (Deleted my ideas, as I'm here for suggestions) What I need: 1. Use an ssh-tunnel for data transfer 2. Be quick with lots of small files 3. Keep revisions 4. Be sure the data I save is not corrupted 5. Intelligent resume functions and be able to deal with network congestion :) 6. Compressed and optionally encrypted storage 7. Be able to extract data from backup easily (filesystem like usage would be nice) How would and with what software would you backup this stuff? Hints to tools that can help solve only part of my problem (like encryption) also greatly appreciated. Greets

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  • Screen recording in Windows 8 makes PC unusable?

    - by Skadier
    OS used: Windows 8 Pro x64 Hi there, I got a weird problem. I tried to record my screen using different screen recording applications like Camtasia7, Hypercam, and some others. So if I hit "record" everything works fine for about 3-4 seconds. Then the PC slows down heavily caused by extremly high IO usage. The PC gets nearly unusable and laggs like hell. I can't switch applications, can't get TaskManager with Ctrl+Alt+Del, or something else without waiting 1-3 Minutes. After about 5-8 Minutes and a bit of luck I am sometimes able to end the process of the recorder and IO calms down very slow(100% IO lasts for about 2 Minutes before becoming normal). I don't know why this happens. Screen recorders that support Windows 8 aren't out afaik but at least Camtasia7 worked with Windows 8 Developer Preview and Windows 8 Release Preview (only had to change record method to .avi). No slow downs or something else. Is there anyone out there who knows this problem too? Is there maybe a solution to this problem?

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  • Windows 7 misses keystrokes from internal keyboard after hibernation (on Acer Aspire 5820)

    - by ron
    I face a very strange symptom on my Acer Aspire laptop (with the factory default Win7 install and divers. Windows update running). After waking the computer from hibernation, it is a pain to type, since on average 5-10 keypresses are missing per 100 presses, using the laptop's keyboard. Steps to reproduce: 1) Power off 2) Power on, wait for system to become usable 3) Open notepad, for 5 times do hit 10x the same character. This gives a similar pattern of 50 chars total: xxxxxxxxxxyyyyyyyyyyaaaaaaaaaassssssssssdddddddddd 4) Optionally repeat. Everything is fine this far. 5) Hibernate. 6) Power on and resume. 7) Repeat steps 3)-4). This time approximately 3-5 character will be missing from each 50 characters. What I ruled out: putting to Sleep or just Locking and resuming from there does not cause problem battery / AC usage does not matter net connection does not matter running processes seem to be the same before and after hibernation key press speed doesn't really matter. For the test I use a nominal 3-5 strokes/second beat. plugging in an external USB keyboard works fine, but the built-in one still misbehaves What could be the problem? How could I diagnose if the keypresses arrive in, but get swallowed at some point? (maybe some nasty keyboard handler hook misbehaves?). Update: It seems that pushing the PowerSmart button and toggling to power saving state fixes the problem. Also, toggling it again back to the original state keeps it fixed. So this may be a fine workaround, but is not a conforming solution.

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  • Can a VM perform better when only two cores instead of four cores are presented to it?

    - by arcain
    We had a VMWare VM at work with two cores allocated to it that ran a pretty heinous process in IIS. Under load the process was maxing out the CPU usage on both cores, so we asked our system engineers to present the other two cores of the physical processor to the VM. The engineer immediately said that this would not improve performance at all, but would make the VM perform worse. That statement didn't make much sense to me, and I'm wondering how what the engineer said could be true. Are there actually cases where four cores presented to a VM would cause worse performance than two cores on the same physical hardware? Let's assume an ideal situation where there's only one VM on the host server, so nothing is being shared with other OS instances. I believe the physical server had a single quad core processor, and was most likely hosting multiple VMs. I don't really know what version of ESX was running on the host, nor do I know with certainty what the physical processor config was, but from within the VM I had access to, I saw two 3.33 GHz AMD processors. In the end, I never got to test the engineer's assertion out because (while we were trying to get the VM upgraded) we were able to optimize the process and reduce it's CPU consumption, and 2) we ended up migrating to a different VM on another ESX server which had four cores presented to it.

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  • Potential impact of large broadcast domains

    - by john
    I recently switched jobs. By the time I left my last job our network was three years old and had been planned very well (in my opinion). Our address range was split down into a bunch of VLANs with the largest subnet a /22 range. It was textbook. The company I now work for has built up their network over about 20 years. It's quite large, reaches multiple sites, and has an eclectic mix of devices. This organisation only uses VLANs for very specific things. I only know of one usage of VLANs so far and that is the SAN which also crosses a site boundary. I'm not a network engineer, I'm a support technician. But occasionally I have to do some network traces for debugging problems and I'm astounded by the quantity of broadcast traffic I see. The largest network is a straight Class B network, so it uses a /16 mask. Of course if that were filled with devices the network would likely grind to a halt. I think there are probably 2000+ physical and virtual devices currently using that subnet, but it (mostly) seems to work. This practise seems to go against everything I've been taught. My question is: In your opinion and  From my perspective - What measurement of which metric would tell me that there is too much broadcast traffic bouncing about the network? And what are the tell-tale signs that you are perhaps treading on thin ice? The way I see it, there are more and more devices being added and that can only mean more broadcast traffic, so there must be a threshold. Would things just get slower and slower, or would the effects be more subtle than that?

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  • AMD processors witn graphics card bundled [closed]

    - by shybovycha
    Sorry for posting this question here - just don't know to which StackExchange website i should be writing. I've heard AMD created processors with video card bundled. So now these processors should work as fast as just usual processors with discrete video card but AMD's ones should use less power and spread less warm. Some googling around gave me the result like "AMD processors of A-series". They were mentioned to be build using that technology i described above. But on the other hand, we have a small rate of publishing and not-very-good quality of AMD drivers. I am a game-developer and web-developer so i need a powerful processor and graphics card and a lot of RAM on board (to make it possible to create a sample Grails application, for example or to create some 3D models in Maya/Cinema4D, for instance). Still i want my battery to be a long-living one, so power usage is a bit critical for me. So, my questions are: are there any processor building technology like i've described and which series they are (if they exist)? which processor shall fit the laptop the best: AMD one or i5/i7 on with nVidia graphics card for the purposes mentioned above?

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