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• What hardware factors may be considered bottlenecks on a Hyper-V virtual server during load testing?

  - by sean

  Our organization is load testing our application using virtual servers via Hyper-V to see what the user load can be using fair equipment on a single box setup. The developer group questioned the validity of the tests given the normal use of the box by the other virtual machines. IT admins answered that it is an acceptable platform to load test on because it has its own CPUs, memory and disks allocated. Is their answer mostly correct? What hardware factors may be considered bottle necks given the other virtual machines when testing our application? For example, would bus speed be a concern or network IO? The application consists of a windows service written using the 4.0 .NET Framework and SQL Server 2008 R2.

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• Cloning Windows 2003 Server to new hard drive results in failure

  - by Level1Coder

  Scenario: Old hdd is a Seagate 320gb SATA drive New hdd is a WD 320gb SATA drive Created an exact clone and replaced old hdd with new hdd. Boot up with new hdd, it gets into Windows 2003 server environment but things look weird. Lots of system event failures in the event viewer log. System is barely unusable, critical services are all down. Boot up with old hdd, everything is fine. QUESTION: Is it possible to do a simple clone of a Windows 2003 server system? All I'm changing is the hard drive, everything else stays the same (old CPU/old mobo/etc..)

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• How is a Chromebook better than using Chrome browser on another OS?

  - by bigpopakap

  I'm looking into getting a Chromebook as a lightweight device to use for basic functions. I'm fully aware of some of the limitations like no native apps, limited functionality while offline (though this is getting better with Google Drive's offline capabilities). Currently, I have a Windows machine on which I've installed Google Drive, so files in that folder are synced. And I use Chrome as my browser. So I have access to all the same apps (Drive, Calendar, Gmail, Google Music, etc.). Is there any advantage to having a Chromebook over my current setup, other than the speed of the lightweight Chrome OS?

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• Does disabling BIOS shadowing increase free RAM space?

  - by user32569

  Hi, I know in these days this is very stupid question, but for study purposes. I read that when PC starts, CPU is set to read adress just under the 4GB. There should BIOS be mapped to by memory controller. My question is, in old days, had disabling BIOS shadowing actually freed some RAM for you? I mean, even when BIOS was not shadowed to RAM directly, still adresses for BIOS MMIO access were wasted. And when you cant adress it, its like there is no extra space gained.

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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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• Will this RAM work well in an iMac?

  - by sala_7

  I want to increase the RAM of my 2.4GHz Intel Core 2 Duo 24" iMac. I currently have 1GB of RAM DDR2 SDRAM 667 MHz. I really want to upgrade, but know nothing about RAM or hardware in general... These are the cards I found: http://www.crucial.com/eu/store/mpartspecs.aspx?mtbpoid=D4B6F603A5CA7304 Are these of quality or should I look at something else? Finally, I have 800MHz of Bus speed, couldn't I get faster RAM? Thanks for taking the time to read, and hoping you take the time to answer.

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• lucid lynx runaway process

  - by Jerome

  I am runnning lucid lynx with a gnome desktop. After uninstalling the klipper program there is a new and unwelcome process that begins at startup and takes around 66% of my cpu time. According to "top", the process number is 10 and the name of the process is "events/1". I am unable to kill the process using "top" or "kill". I have no extra startup applications except for gnome-do and tomboy. Eliminating these has no effect. Can anyone help?

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• pdflush hanging on Amazon EBS drives when using multi-GB files - any workaround?

  - by rhh

  Hello, When I run gunzip on a 1.7GB file (which generates an 8GB file) on an EBS volume, pdflush freezes after gunzip runs and the CPU hangs indefinitely at 100% IO Wait. Here's the output from 'ps aux | grep pdflush'. Note the D status root 87 0.0 0.0 0 0 ? D 06:18 0:00 pdflush root 88 0.0 0.0 0 0 ? D 06:18 0:00 pdflush The only solution is to kill the pdflush processes. The processes don't die immediately either. This problem is repeatable and happens with new instances. I'm running 2xlarge instances and I have way more RAM free than is being used (i.e. /proc/meminfo shows 20+GB MemFree) Has anyone found a workaround to this problem in the past? Thanks for any thoughts. Robert

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• New power supply and now HDDs are not recognized

  - by Michael

  So I upgraded to a new X4 ULTRA power supply that was recommended to me by a local TigerDirect store. After installing it along with a new liquid cooling system, I booted it up and it automatically fried my CD Drive. After that I noticed that the OS wouldn't start and figured out that none of the 4 HDDs in my computer were being recognized by the BIOS. I feel them spool at a steady pace and have tried new cables and connections but to no avail. I triple checked all of the connections and cables and have no idea what is wrong. This isn't the first time I changed a PS or CPU cooling system but I am at a dead end. Any ideas, aside from buying a USB HDD reader and seeing if they are all fried? Also, this is a stock Gateway mobo with the mobo USB connections already dead. Could the new PS have fried the SATA connections??

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• How to test Laptop NIC's throughput using a router and PC - without be bounded?

  - by 0x90

  My setup includes: Cisco router An i-7 PC running windows A laptop with high speed wifi nic, which I want to check its throughput. I would like to run an FTP server on the PC. hook the router over cables to the PC. I would like to have the PC create its own subnet accessible via the cisco router that would be hooked directly to the PC's nic. From the laptop I want to connect via wifi to the PC's wireless router and connect to the ftp server on the PC. is it possible? how do i connect the router to the PC nic and make it broadcast a subnet via wifi for my laptop to connect to? how do i configure an FTP server to operate only on this subnet?

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• Why are my downloads up to ~1500KByte/sec only, when the ADSL connection locks at 13611Kbit/s?

  - by leladax

  No uploading is going on other than the overhead of downloading which appears to be not high for the abilities of the connection: Only about 30-40KByte/s when the router locks at 1012Kb/s and other direct uploads or uploading overheads can reach more than 100KByte/sec so I don't think it's a congestion at uploading that is doing it. Is there something I miss? Because I assume 13611Kbit/s should be ~1701Kbyte/sec. Is it an overheard at the ADSL level I don't understand? Could it be the ISP doing it? If it's active throttling it can't be on single connections since 2 high speed connections still go up to ~1500KByte/sec. It's not an example on torrents or other complex situations. The tests were on Ethernet, but I doubt the results would be different on wireless. I wonder if the settings of those connections at my end could be doing it, e.g. MTU settings, though I haven't touched the defaults of a common Realtek NIC.

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• Is paravirtualization evil?

  - by Daniel

  I have an VMWare ESX Server v3.5 with a few virtualized Debian Lenny VMs (kernel 2.6.22 with vmi) running Apache Tomcat 5.5. I enabled paravirtualization, and Disk IO increased from about 240MB/s to 380MB/s, making me a happy admin. The problem now is that my apache tomcat becomes deadlocked during startup, running with 200% CPU (I have 2 CPUS assigned to the VM), and don't know how to get both: A stable system and a fast system. I somewhere heared that paravirtualization is legacy anyway and won't be available on newer ESX servers. Is there a replacement for this seemingly performance-improving option, or is it discontinued becauses it is just unstable? What is the state of paravirtualization? Should I ignore it completely? Thanks for all answers in advance.

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• Linux IO scheduler on databases with RAID

  - by Raghu

  Hi, I have a linux database(MySQL) server(Dell 2950) with a 6-disk RAID 10. The default IO scheduler on it is CFQ. However, from what I have read and heard, there is no need for a scheduler like CFQ when reordering/scheduling is also done by underlying RAID controller; on the contrary since it does not account underlying RAID configuration into account performance may actually degrade with CFQ. The primary concern is to reduce CPU usage and improve throughput. Also, I have seen recommendations of using noop/deadline IO scheduler for databases primarily because of the nature of their R/W access.

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• Is (Ubuntu) Linux file copying algorithm better than Windows 7?

  - by Sarath

  Windows Copying is a real mess ever since Windows Vista. Even Microsoft claims they've improved the performance, from a user perspective, it's not quite visible. Even with single file the copying window appears too much time for 'Calculating' and then finishing the copy(Even after 100% completion some times the dialog remains active). At the same time, I was backing up some files in Ubuntu Linux. I felt it's really fast. Might be a feeling caused by faster UI updates. I read an informative post from Jeff Atwood few years back on Windows File Copying. but what my specific questions are Is (Ubuntu) Linux file performance is better than Windows-7? Are both algorithms, Windows and Linux is making use of multiple threads and pipelining mechanism to improve the speed? If yes, which one is better?

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• ideal memory configuration 4 bank, ddr3, AM3+ FX - 1 vs 2 vs 4 dimms?

  - by TardisGuy

  Ok, so ive been looking around, trying to learn and understand the way that ram works. Ive gotten one answer that said "The addressing is best for 2 sticks, and when you use 4; it slows down" Another answer said something like: Theres bank/channel interleave that makes the memory read like one stick Also I read something about the memory density also being a factor. I dug further and found out that theres a higher speed limit on my board for 2 sticks vs 4, so now im trying to put an image in my head of how and why, and... pfft. Can anyone explain, or recommend a resource that would answer these questions?

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• How to limit router bandwidth?

  - by David

  Hello, Is there a way to configure my (D-Link DIR-615) router to throttle down the allowed bandwidth after a certain amount of bandwidth has been used? For instance, I want my router to operate normally up to 20GB. After 20GB I want the router to limit bandwidth to a fraction of the normal speed (perhaps 1/5th). I live in Canada, so in about a month, everyone is going to be billed based on the amount they used (usage based billing). Instead of the unlimited bandwidth that I am enjoying now, most people will be capped at 25GB and will have to fork out $2/GB of over usage. Thank you in advance for the help.

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• Computer temporarily freezes and then resumes

  - by trizicus

  This happens on ALL operating systems (7, Ubuntu, etc.). What happens is everything for 1-3 seconds becomes unresponsive, I then hear what sounds like my other internal hard drive 'spinning up', and then viola everything is responsive again. Note: Already ran SMART tests, no issues at all. I think issue is that the HDD spins down and when need it gets 'turned-on' (OS settings turn off HDD's after 20 mins of inactivity) and because my pagefile is on the other HDD it causes OS to temporarily freeze. Need more tips, and insight. Thanks More info: Running Quad CPU, 4GB RAM, Intel SSD, GT 240.

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• Custom PC won't boot Windows 7 dvd but does with windows vista

  - by M_rk

  I ordered a custom build PC. (It was assembled by the store). This is the setup Motherboard: Asrock A75 PRO4-M DVD drive: LG GH24NS90 SSD: Samsung 830 series 128GB DDR3 SDRAM: 2× Corsair XMS3 CMX4GX3M1A1600C9 (2× 4GB) APU (CPU+GPU): AMD A8-3850 Boxed I got a installation DVD for Windows 7 Professional x64 English (including SP1), but it doesn't work. I got a new one from the store and it doesn't work either. However they work on a other PC. So the DVDs aren't bad. I tried an old installation DVD for Windows Vista. Both 32 bit and 64 bit work. So the boot order and such are right and working on the new PC. Is there something I'm missing here? Any ideas on how to make it work?

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• Amazon EC2 Web server in Load Balancer gives 503

  - by dale

  we've been running our web servers at Amazon with load balancer and auto-scaling for over a year with no problem. All of a sudden today the request began to get aborted with the error: 503 ... Backend server is at capacity The web servers are at 1% CPU and no other alarms trigger. We use Amazons load balancer and nginx. Lots of requests like this are showing up in the access_log. 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" 10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-" Any thoughts?

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• Home movie video browser

  - by Jim Hunziker

  I have a bunch of home movies that don't have useful filenames because they came straight off the camera. (I'm using Vista 64, by the way.) Picasa is pretty good for browsing through them and watching them, but it doesn't use my video card for rendering the videos. My CPU gets pegged at max usage, and full screen barely works. Windows Media Player or Quicktime works fine. Is there another application (like Picasa) that can be used for browsing through movies that both uses my video card and shows thumbnails of all the movies in my collection? I'd rather have something nicer than Windows Explorer. (The movies are h.264 AAC 1280x720.)

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• Best Practice: Migrating Email Boxes (maildir format)

  - by GruffTech

  So here's the situation. I've got about 20,000 maildir email accounts chewing up a several hundred GB of space on our email server. Maildir by nature keeps thousands of tiny a** little files, instead of one .mbox file or the like... So i need to migrate all of these several millions of files from one server to the other, for both space and life-cycle reasons. the conventional methods i would use all work just fine. rsync is the option that comes immediately to mind, however i wanted to see if there are any other "better" options out there. Rsync not handling multi-threaded transfers in this situation sucks because it never actually gets up to speed and saturates my network connection, because of this the transfer from one server to another will take hours beyond hours, when it shouldn't really take more then one or two. I know this is highly opinionated and subjective and will therefore be marked community wiki.

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• Enable a program in Windows to run multiple times?

  - by user135490

  I've got this legacy software that only allows you to run one copy at a time, it detects that you have another session opened and it won't allow you to open a second instance. The problem is this is a cpu intensive program and it only use a single core. Is there any hacks or tweaks so I can trick it and open more than one instance? This would allow me to retire about 5 servers... I'm using Windows 2008 R2. I had to use cff explorer to enable the use more than 2GB RAM as the program crashes when it tries to use more than 2GB.

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• nagiosgraph new services not showing

  - by Eleven-Two

  I am using Nagios Core with Nagiosgraph and had only enabled graphing for cpu usage for a while. This worked fine, but now i wanted to add some more services (for example memory usage). The new services are not working (no rrd data is generated). The Nagiosgraph site only says "no data available" and I get no error in apache log, nagiosgraph.log or nagiosgraph-cgi.log. The new services are standard services (nsclient++ MEMUSE for example) and of course they are included in the map file. If I execute the checks manually, it shows also the perfdata. I added the services by enabling the "graphed-service" use. Did I miss something?

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• HAProxy being killed with more that 54,000 connections

  - by Olly

  I am trying to run HAProxy (1.4.8) on a EC2 machine running Ubuntu 10.04. I need HAProxy to be able to handle many thousands of long-running persistent connections (websockets). With the current setup HAProxy gets killed at around 54,300 connections (roughly). If I am running HAProxy in the foreground, the only output is "Killed". Am I right in thinking this is the Kernel killing the process? Is this because it is out of resources? Can I increase the resources? The CPU and memory consumption are low with 50,000 connections, so I don't suspect either of these. How can I prevent this from happening?

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• Tuning MySQL to consume less memory

  - by Alex

  I have a VM which has 2GB Ram, (full specs) And I am setting up a site which has one table in particular with over a million records. There's little or no usage of this particular database (perhaps once or twice a day) but simply running mysql grinds the whole server to a halt. I've looked through the top results but nothing is really denting the CPU however the memory seems to be the issue. The site isnt even live of taking requests yet. the memory situation looks like this: # free -m total used free shared buffers cached Mem: 2006 1880 126 0 3 53 -/+ buffers/cache: 1823 183 Swap: 2047 345 1702 Are there any good pointers to tune mysql to stop hogging the system memory? Thanks very much EDIT: (requested by 8bit): http://tny.cz/b41a0b12

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