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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanler

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• "broken" windows xp after disc replacement

  - by epeleg

  Windows xp pro OEM was installed on my machine, Disk was failing so I cloned it to a new disk (larger one). Now windows said that the hardware has changed significantly and I need to re-activate, and I would gladly do (got the product number on a sticker on the machine) - only that for running the activation process I need to be logged-in, but when I try to login it just automatically logs me out again :( I know my credentials are O.K. because I can connect to the machine remotely and also use sysinternals tools such as PsExec or PSList etc. on it from a remote machine by specifying user and pasword. Login via safemode does not work any differently then in normal mode... I tried to run rundll32.exe syssetup,SetupOobeBnk (as suggested in several places on the net) using PsExec but it did not seem to help... Is there any way out of this evil circle? [ can't log in because not activated - cant activate because not logged in ]

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• SOHO Netflix and network security

  - by TW

  I want to use WIFI for HiDef video, but I don't trust it for my office PC's. I've heard of VLANs but I have no idea how to set it up or what (SOHO) hardware to buy. Other than getting 2 different DSL lines, how can I be absolutely sure that the PC side doesn't get hacked? What if I want to use MS Home server as a backup device for both sides? Can I make it "read only" for the PC side, and physically change the cable if I need to restore? TW

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• powertop keeps telling me to turn off the same thing, over and over

  - by Rory McCann

  I am running an ubuntu lucid laptop on battery. I want to make my power last as long as possible. Aswell as the normal things like turn down screen brightness, and turn off wifi, I'm using powertop. It will sometimes tell me things, e.g.: Suggestion: Enable USB autosuspend by pressing the U key OK, I press the U key to do that. However a few minutes later it will give me the same suggestion, it's as if it never enabled USB autosuspend the first time. It does this for other things aswell, not just USB autosuspend. e.g. it'll give me this message frequently: An audio device is active 100.0% of the time: hwC0D1 LSI ID 1040 Q - Quit R - Refresh A - Turn HD audio powersave on Is there anything I can do to make these choices 'stick'? Or do I have some unfortunatle hardware that won't obey linux? (If so, is there any way to confirm this?)

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• OS X Snow Leopard fails to boot after upgrade to 10.6.1

  - by pixeline

  I'm a fairly recent mac user. Been using windows for decades and happily switched. But i upgraded from 10.6 to 10.6.1 last night and the upgrade looks like it failed. I restarted the machine when it asked to then went to bed. In the morning the computer was still trying to shut itself off. So i forced the shutdown, restarted, but now i'm stuck with the loading spinner. What can i do? UPDATE: Verbose didn't show anything interesting. i also did the hardware test. Nothing comes up wrong. Disk utility did not find any error on the HD. But, it did show a fatal error when checking permissions.

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• Windows SBS 2011 DNS Role (service) failing & needing restarting

  - by HaydnWVN

  Have a Windows SBS 2011 with Exchange that is handling all DNS for the network. Since getting a 3rd party (Hardware & Support) to setup a recieving FTP service and restricting Exchanges memory useage for another 3rd party product (Stock software) the local network seems to periodically 'lose the internet connection'. Delving deeper I found that the DNS service is somehow failing/stopping without the actual service on the server reporting such (nothing in event logs). A simple restart of the 'DNS Role' on the server solves the problem. The manager onsite reports that he has to do this most days in the afternoon - yet not at the same time and other days it works fine without a restart being required. I'm unable (lacking sufficient SBS2011 knowledge) to diagnose this further, ideally I would like the DNS Role to report (and log) the failure, then automatically restart itself.

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• SQL 2008 Mirroring, how to failover from the mirror database?

  - by Luis

  I have configured a database mirroring setup in SQL 2008 using the High-safety, Synchronous mode, without automatic failover. I don't have a Witness instance. Regarding high availability, I understand Mirroring is a better strategy than Log Shipping (faster and smoother failover), and cheaper than Clustering (because of license and hardware costs). According to the MS docs, to do the failover you need to access to the Principal database and in the "Mirror" options click the "Failover" button. But I want to do this from the Mirror database, because what would be the benefit as all this setup is being done in case the Principal server knocks down? Evidently I am missing something. If Mirroring is not a solution for server downtime (as would be Clustering, if I understand correctly), then which practical (i.e. real world examples) cases would benefit from Mirroring for high-availability purposes? Thank you very much for your response! I really need some enlightment.

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• Cannot import video from a DV camcorder over FireWire

  - by qbeuek

  I have a JVC GR-D320 miniDV camcorder that has a FireWire interface. I recently upgraded to Windows 7 RTM (64 bit, fresh installation). When I connect my camcorder through FireWire, I can see it in Device Manager without any warnings or problems, but I cannot capture videos from my miniDV tapes. After connecting, AutoPlay displays "Import Video could not find a compatible digital video device. Verify that the digital video device is properly connected and turned on." When using Windows Live Photo Gallery after selecting the import option, my camera is not listed. The camera used to work perfectly on the same hardware before upgrading to Windows 7 RTM 64 bit (it used to work fine on Windows XP SP3 32 bit). Googleing revealed that people had the exact same problems in Vista, but no solution was provided. Any help?

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• How much should I charge for setting up a client web server? [closed]

  - by Vincent

  I have quite the eccentric client who wants to move all his ecommerce websites (about 5-10, all PHP/MySQL) to his own web server that I'm supposed to build. He doesn't want to hear anything about VPS hosting and all the issues and expenses related to owning a server. My responsibility would be to buy all the hardware, install and configure software, etc. How much should I charge for this? I'm planning to start with two relatively moderate Dell PowerEdge C2100 servers, one for web (NGINX), one for db (MySQL).

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• Is there any way to play Netflix (stream) in Windows Media Player 11?

  - by Not So Sharp

  Googling for a solution yields a ridiculous page on eHow that instructs to insert a DVD from Netflix. But I am not interested in the DVD option. I am only interested in streaming and unfortunately none of my browsers (IE, FF, Chrome) uses the hardware acceleration built into my video card. The only way I can play non-choppy video on my PC is via Windows Media Player, but WMP doesn't list Netflix as one of the supported online stores for some reason. Any idea or trick how stream Netflix on WMP 11 instead of a browser?

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• How to access an SD card from a virtual machine?

  - by Punit Soni

  I want to format an SD card from my Linux virtual machine. I have a built-in SD card reader in my laptop. I tried using VirtualBox and VMware Player and installed Ubuntu 10.04 guest. None of them are showing the SD card reader as a device. I can access the SD card from the Windows host. I am not interested in solutions using shared folders as I want to access the SD card as hardware (it should show up in /dev). I basically want to set up the SD card for BeagleBoard, but I don't want to install physical Ubuntu in my PC.

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• unable to install new versions of linux on my PC

  - by iamrohitbanga

  I have an MSI-RC410 motherboard with onboard ATI Radeon XPress 200 series Graphics card. I have used OpenSuse-11.0 on my PC for over an year. but when I tried to upgrade to OpenSuse-11.1, I managed to install it only to find that several features were missing. for example /dev/cdrom was missing. Also install DVD of Fedora 11 did not work. I have also tried Ubuntu-9.10 live cd. When I boot from the CD i get the initramfs command prompt. Still able to install old versions of these OSs. What is the reason for this behavior? Does it have to do anything with the new version of the linux kernel not being compatible with my hardware? What should i do to install new versions of Linux?

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• Fedora Installation with software repository in DVD does not work

  - by Raks

  I bought a new assembled PC with processor as Core-i3(2120) and Intel H61 motherboard and was trying to install Fedora 16 from a DVD. This DVD contains all the packages so that installation does not require to download packages from internet. I have used this DVD to install Fedora 16 offline many a times though in machines with different hardware configuration. But in this new machine when the installation reaches the stage wherein it asks for Software repository selection I select CD/DVD but the system fails to read the media and throws up an error that it cannot detect the media. THe LED in the DVD writer also indicate that the DVD is not being read. Now there is neither a problem with the DVD or the DVD drive because the installation started from the DVD itself. So what could the problem be, anything in the BIOS that is causing the problem, Is there any way I could utilize the packages already existing in the CD so that I save downloading the packages from DVD

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• Windows 2008R2 two node failover cluster creation fails

  - by Francois Wolmarans

  We have just installed two Windows 2008R2 Enterprise machines with identical hardware. When running the cluster validation everything is ok. When creating the cluster it fails with the following error: An error occurred while creating the cluster. An error occurred creating cluster 'CLUSTER04'. The parameter is incorrect The logfile on the first node where we are running our config from, does not show any errors. On the second node we get: The Cluster service is shutting down because quorum was lost. This could be due to the loss of network connectivity between some or all nodes in the cluster, or a failover of the witness disk. I've double checked and all communication between the servers are fine. Even when creating a one node cluster it gives the error. There are other failover clusters we have setup without any issues.

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• Keyboard doesn't load in windows xp after Alureon infection

  - by alureonissue

  AVAST detected alureon in a number of system files including atapi.sys and kbdclass.sys iple I quarantined those files, and restarted my machine. After restarting, my keyboard and cdrom did not work (I assumed those drivers would be automatically replaced, but was apparently wrong.) I went into device manager, and checked for hardware changes, it fixed the cdrom (which works now) and looked as though it fixed the keyboard as well. It did not. After multiple reboots the keyboard is still not recognized. It works up until the XP login screen loads, after which it is completely unresponsive. Any advice would be appreciated. Thanks :)

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• Use an unsigned driver in Windows 7 x64

  - by rjmunro

  I'm trying to use the RBC9 SpaceNavigator TEST x64 build drivers for my SpaceNavigator 3d joystick so that it can work as a normal joystick in games like Quake. Unfortunately, I get the error "This version of windows requires all drivers to have a valid digital signature" and in the "Device status" in device manager, I get "Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)". Is there a way to work around this issue?

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• Win 7 BSOD stucks at dumping

  - by AFO

  Recently Ive been getting frequent bsods, which always gets stuck at dumping without finishing it, with most of them showing no error messages. This never happened before i upgraded to new rams, but 2 passes of memtest86 turned out fine. Tried reinstalling windows, problem still there. Tried initiating a manual crash, and that did create a successful dump. The SSD win 7 is on doesn't seem to have any problems, crystaldisk says its healthy. Varied the cpu multiplier between stock and +500Mhz, crashed regardless. Left voltage control to auto. Im fairly sure its a hardware problem, just cant pinpoint which specific part(s). The specs- Windows 7 x64 (1 day old) 955 x4 BE c3 (running at stock) (3.5 years old) GA-970A-D3 (1.5 years old) Gigabyte 6950, unlocked to 6970 (still at 6950 speeds) (<3 years old) 2x4GB 1600 CL9 HyperX Blu (running at 11-11-11, default motherboard setting) (<1 month old) Plextor M5s (around 5 months)

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• How to fully use the 4G in my Laptop under Ubuntu 9.10 - 32-bit

  - by jfmessier

  I have a Toshiba A100, which I upgraded to 4G of RAM. The hardware startup indeed shows 4G of RAM, and I recently installed Windows 7, just to see how it behaves on it. So far so good, it displays 4G of RAM. Not that I tried to use it all, but it displays it. Previously under XP, I also would see 4G of RAM. But under Ubuntu 9.10 (32 or 64 bits), it only displays 2.9 G of RAM. And my kernel is the "pae" compiled one, which is supposed to do the trick to work around the 32-bit CPU limitation. How can I get Ubuntu to fully use my 4G of RAM ?

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• XP boot timer=> set, but does nothing?

  - by mark

  My PC has XP Pro and the boot.ini file looks like this: [boot loader] timeout=30 default=multi(0)disk(0)rdisk(0)partition(2)\windows [operating systems] C:\CMDCONS\BOOTSECT.DAT="Microsoft Windows Recovery Console" /cmdcons multi(0)disk(0)rdisk(0)partition(2)\windows="eXPee Pro" /noexecute=optin /fastdetect Up until about a week ago it would just time-out and boot normally. I haven't made any hardware changes at all. Now, when the system boots it just sits there and waits for me to hit -enter-. I've searched all over for explanations & possible causes, but found nothing which seems to relate. Anyone here have any idea what may have caused the timer to simply quit working like that ? (BTW, the system clock works just as it ever did and keeps time precisely.) Thanks.

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• Keep-Alive header not sent from Tomcat 5.5 http connector?

  - by Codek

  Hi, We're currently using a hardware load balancer, which then goes to Apache and that then goes to Tomcat 5.5 via the AJP connector. We've decided to dump apache for various reasons - In our current system it doesnt provide any advantage. However when I look at the headers sent when we do this, the "Keep-Alive: timeout=15 max=96" header doesnt get sent when you use the tomcat http connector Interestingly, i can find no documentiation on "keepalivetimeout" for tomcat5.5, but i can for tomcat6. But neither can i find evidence that tomcat5.5 doesnt support this setting. here's my connector: <Connector port="8090" maxHttpHeaderSize="8192" maxThreads="400" minSpareThreads="150" maxSpareThreads="300" enableLookups="false" connectionTimeout="2" maxKeepAliveRequests="400" disableUploadTimeout="true" /> So; Is there any way I can specify the keepalive timeout if we use the http connector with tomcat 5.5, and force this header entry to be sent? Thanks, Dan

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• Reduce the I/O priority of Windows Backup (Windows Server 2008 R2)

  - by HelloSam

  I have a PostgreSQL running on Windows Server 2008 R2 x64 box. And I have scheduled a backup everyday from the RAID 1 DB disk to a dedicated standalone disk. They are SAS 15k on Dell PERC 6i. I am using the built-in Windows Server Backup for purpose. The problem is, whenever the backup process is kicked in, the database performance is hogged. I would say almost a 10x of performance reduction. From the resource monitor, the disk queue is in the double digit range when backing up, and less than 1 during the day. The disk activity is like ~30-50MB/s during backup, so I guess the hardware is acting normally, though wbengine.exe takes up most of the portions. I think reduce the IO priority of the backup process would be an answer, but I couldn't find a way to. Tuning process CPU priority does not seems to help.

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• One bigger Virtual Machine in Cloud

  - by flyer

  I just setup virtual machines on one hardware with Vagrant (this is just a test environment, not production!). I want to use a Puppet to configure them and next try to setup OpenStack. I am not sure If I am understanding how this should look at the end. Is it possible to have below architecture with OpenStack after all where I will run one Virtual Machine with e.g. 12 cores? ------------------------------- | VM (12c) | ------------------------------- | NOVA | NOVA | NOVA | ------------------------------- | OpenStack | ------------------------------- | VM (4c) | VM (4c) | VM (4c) | ------------------------------- | Bare Metal (8c) | ------------------------------- I need this information to have a bigger picture to continue.

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• Back / Forward mouse buttons do not work in VMWare Workstation 6.5 Guest OS

  - by Tim Lara

  I am using a Logitech G9 mouse and running VMWare Workstation 6.5.3 on Vista x64. The guest OS is Win XP, and has the most current version of VMWare Tools installed. Left / right buttons and mouse wheel scrolling work fine in the guest OS, but the back / forward buttons are apparently not recognized. I have tried installing the Logitech software inside the guest OS as well, but it still did not recognize the back / forward buttons. (I didn't really expect this to work since the guest OS doesn't actually see the mouse hardware as a Logitech G9 directly anyway.) I vaguely remember seeing something a while back about editing the virtual machine config file to specify a 5-button mouse rather than the default 3-button setup, but I can't seem to find any specifics on how to do so in the VMWare documentation. Does anyone know if such a workaround exists, or is 5-button mouse functionality just not supported?

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• Why can't I play YouTube clips properly anymore?

  - by NoCanDo

  I haven't got the faintest idea what happened, but since about 3-4 days now I can't play any clips on YouTube properly at all. Proper as in continuously without loading, pause, playback, pause, loading, playback, pause, loading, playback, etc. I haven't changed anything hardware nor software-wise. On the other hand I can play Break.com, Viddler, Liveleak, Metacafe without any trouble. I tried my own tips, but that hasn't helped me at all. What on earth happend? Is it me, or is it YouTube? I'm using Firefox 3.6 Beta 5. But the issue is the same on Chrome as well as on Internet Explorer.

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• Mac Mini 1.66 no sound on Windows 7

  - by Steph

  I've tried everything I could to get the sound working. I've tried to install the drivers from the Snow Leopard disk, then I went and got the latest RealTek drivers from the RealTek website. Then I read that old Mac mini's could have an integrated Cirrus chip, and I tried to grab the latest driver from the website, and it appeared to install, but nothing. There's also nothing listed under Sound and ... in the Device Manager. I've tried to manually include a legacy driver, which worked for RealTek but not for the Cirrus driver. Of course it said there was no RealTek hardware install, which makes me think it's a Cirrus chip. Any further suggestions or thoughts would be really appreciated. This is a Mac Mini 1.66. I'm also not sure how to be able to detect what card is integrated into the system, so that would be helpful too (remembering that there's no driver installed). Even just to get the chip type would be great to confirm.

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