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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanlor

  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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• 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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• Dock displays low-resolution icons

  - by squircle

  Recently, I've noticed that the dock has been starting to display low-resolution icons in place of the former high-resolution icons for common apps like Stickies, Word, iTunes and Preview. Looking at the .icns file within each program, all copies of the icon are present within the file (high and low resolutions), but the dock refuses to display them, leaving some programs looking like this: Restarting doesn't stop this behaviour, nor does a killall Dock, nor removing the icon and replacing it in the dock. In Finder, the icons display normally. Does anybody know what may be causing this issue? Thanks!

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• APC and "apc.gc_ttl" :: How Low is Too Low?

  - by nojak

  I currently have my apc.gc_ttl set to 600 to help keep fragmentation down. Since apc.gc_ttl just sets the time on cache for garbage collection, I don't see any harm in keeping it this low. However, I'm new to APC, and have seen many configurations online that use a 3600 TTL, which seems quite long to me for garbage collection cache... Is 600 too low? Is 3600 too high? As I'm sure mileage varies on this setup, is there a good rule of thumb to follow?

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• Link between low level drivers and tty drivers

  - by agent.smith

  I was writing a console driver for linux and I came across the tty interface that I need to set up for this driver. I got confused as to how tty drivers are bound with low-level drivers. Many times the root file system already contains a lot of tty devices. I am wondering how low-level devices can bind to one of the existing tty nodes on the root file system. For example, /dev/tty7 : Node on the root file system. How does a low-level device driver connect with this node? Or should that low-level device define a completely new tty device?

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• Replacement for C low level programming?

  - by Sauron

  So C obviously has a pretty dominant low level programming stronghold.....but is anything coming out that challenges/wants to replace it? Python/C#/etc all seem to be aimed at very high level, but when it comes down to nitty-gritty low level stuff C seems to be king and I haven't seen much "try" to replace that? Is there anything out there, or does learning C for low level stuff seem to be the standard?

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• one two-directed tcp socket OR two one-directed? (linux, high volume, low latency)

  - by osgx

  Hello I need to send (interchange) a high volume of data periodically with the lowest possible latency between 2 machines. The network is rather fast (e.g. 1Gbit or even 2G+). Os is linux. Is it be faster with using 1 tcp socket (for send and recv) or with using 2 uni-directed tcp sockets? The test for this task is very like NetPIPE network benchmark - measure latency and bandwidth for sizes from 2^1 up to 2^13 bytes, each size sent and received 3 times at least (in teal task the number of sends is greater. both processes will be sending and receiving, like ping-pong maybe). The benefit of 2 uni-directed connections come from linux: http://lxr.linux.no/linux+v2.6.18/net/ipv4/tcp_input.c#L3847 3847/* 3848 * TCP receive function for the ESTABLISHED state. 3849 * 3850 * It is split into a fast path and a slow path. The fast path is 3851 * disabled when: ... 3859 * - Data is sent in both directions. Fast path only supports pure senders 3860 * or pure receivers (this means either the sequence number or the ack 3861 * value must stay constant) ... 3863 * 3864 * When these conditions are not satisfied it drops into a standard 3865 * receive procedure patterned after RFC793 to handle all cases. 3866 * The first three cases are guaranteed by proper pred_flags setting, 3867 * the rest is checked inline. Fast processing is turned on in 3868 * tcp_data_queue when everything is OK. All other conditions for disabling fast path is false. And only not-unidirected socket stops kernel from fastpath in receive

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• one two-directed tcp socket of two one-directed? (linux, high volume, low latency)

  - by osgx

  Hello I need to send (interchange) a high volume of data periodically with the lowest possible latency between 2 machines. The network is rather fast (e.g. 1Gbit or even 2G+). Os is linux. Is it be faster with using 1 tcp socket (for send and recv) or with using 2 uni-directed tcp sockets? The test for this task is very like NetPIPE network benchmark - measure latency and bandwidth for sizes from 2^1 up to 2^13 bytes, each size sent and received 3 times at least (in teal task the number of sends is greater. both processes will be sending and receiving, like ping-pong maybe). The benefit of 2 uni-directed connections come from linux: http://lxr.linux.no/linux+v2.6.18/net/ipv4/tcp_input.c#L3847 3847/* 3848 * TCP receive function for the ESTABLISHED state. 3849 * 3850 * It is split into a fast path and a slow path. The fast path is 3851 * disabled when: ... 3859 * - Data is sent in both directions. Fast path only supports pure senders 3860 * or pure receivers (this means either the sequence number or the ack 3861 * value must stay constant) ... 3863 * 3864 * When these conditions are not satisfied it drops into a standard 3865 * receive procedure patterned after RFC793 to handle all cases. 3866 * The first three cases are guaranteed by proper pred_flags setting, 3867 * the rest is checked inline. Fast processing is turned on in 3868 * tcp_data_queue when everything is OK. All other conditions for disabling fast path is false. And only not-unidirected socket stops kernel from fastpath in receive

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• What next generation low level language is the best bet to migrate the code base ?

  - by e-satis

  Let's say you have a company running a lot of C/C++, and you want to start planning migration to new technologies so you don't end up like COBOL companies 15 years ago. For now, C/C++ runs more than fine and there is plenty dev on the market for it. But you want to start thinking about it now, because given the huge running code base and the data sensitivity, you feel it can take 5-10 years to move to the next step without overloading the budget and the dev teams. You have heard about D, starting to be quite mature, and Go, promising to be quite popular. What would be your choice and why?

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• Windows 7 64 Bit Can't Get Past Format

  - by Soren

  favorite Just assembled a new machine: MSI 880GM-E41 motherboard 500GB Samsung hard drive AMD Athlon II X4 640 processor 4GB RAM Windows 7 64 Bit LITE-ON Black 4X Blu-ray reader I boot up, start the install. When it gets to the screen to select what partition, the motherboard loses power. It doesnt make sense, I can leave it in the bios settings for a very long time and it doesnt lose power. When it does lose power, the monitor shuts down and the mouse loses power, but the power light stays on. I cannot tell if it is a harware or software problem.

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• Windows 7 Can't Get Past Format

  - by Soren

  Just assembled a new machine: MSI 880GM-E41 motherboard 500GB Samsung hard drive AMD Athlon II X4 640 processor 4GB RAM Windows 7 64 Bit LITE-ON Black 4X Blu-ray reader I boot up, start the install. When it gets to the screen to select what partition, the motherboard loses power. It doesnt make sense, I can leave it in the bios settings for a very long time and it doesnt lose power. When it does lose power, the monitor shuts down and the mouse loses power, but the power light stays on. I cannot tell if it is a harware or software problem.

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• Keyboard automatically disconnects and reconnects

  - by Algorithms

  The problem i am facing is the keyboard (USB) automatically disconnects when there is a fluctuation in the power supply to the speaker. The speaker and the pc both draw power from a apc ups. The fluctuation occurs because the speaker plug is not tightly connected to the ups power outlet. It is okay for normal work, but a accidental jerk causes the fluctuation. However after some amount of time (usually within 5 seconds) the keyboard automatically reconnects and windows plays the sound of hardware connected. This problem will also occur if I manually take out the speaker power cable from the ups power outlet. My question is whether the problem I am facing is due to electrical issues, or due to software problems. PC config: OS : Windows 7 Ultimate UPS : APC 600 VA PSU : Corsair TX 650 Speaker : Realtek

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• USB hard drive doesn't graceful power off after eject on Windows 7

  - by Sim

  I have a couple of Seagate FreeAgent Go external USB hard drives and would like them to gracefully power off after ejecting in Windows 7. With Windows XP a few seconds after they are ejected they gracefully power off. When ejecting them on Windows 7 they just stay on and have to be physically disconnected before they lose power. I have checked the hard drive removal policy and it is set to quick removal. I have also looked in the Seagate forums but I couldn't find any info on this so I thought I'd ask the SuperUser community on any ideas why the difference and how to get the same behaviour in Windows 7 as in XP? Update: I am finding that this also happens with USB thumb drives as well. My current theory is that there were changes to the driver model with Vista/Win 7 that haven't been reflected in the device drivers yet. So things that worked under XP don't under Win7 as the drivers haven't been updated for the new model. Does that sound right?

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• Errors reported by "powercfg -energy"

  - by Tim

  Running "powercfg -energy" under Windows 7 command line, I received a report with following three errors: System Availability Requests:Away Mode Request The program has made a request to enable Away Mode. Requesting Process \Device\HarddiskVolume2\Program Files\Windows Media Player\wmpnetwk.exe CPU Utilization:Processor utilization is high The average processor utilization during the trace was high. The system will consume less power when the average processor utilization is very low. Review processor utilization for individual processes to determine which applications and services contribute the most to total processor utilization. Average Utilization (%) 49.25 Platform Power Management Capabilities:PCI Express Active-State Power Management (ASPM) Disabled PCI Express Active-State Power Management (ASPM) has been disabled due to a known incompatibility with the hardware in this computer. I was wondering for the first error, what does "enable away mode" mean? for the second, what utilization percentage of CPU is reasonable? for the third, what is "PCI Express Active-State Power Management (ASPM)"? How I can correct the three errors? Thanks and regards!

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• Acer aspire 5520 power light blinks no boot

  - by Shawn Mclean

  My laptop was working fine last night, I hibernated it and went to sleep. Got up, pressed the power button. The power light comes on for 4 seconds and the hdd light blinked a few times, then it turned off for a second then repeats the process. The only way to stop this process/power down is to remove the AC and take out the battery. It does not even reach a boot screen, nothing shows up on the screen, fan does not start. People on this forum has the same problem but they suggest to put the laptop in a oven and heat it (reflow). What could be the problem? Is there another solution other than a reflow? I dont feel like putting my motherboard in the oven.

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• My Macbook Pro doesn't give any reaction when pressing the power button

  - by Juri

  An hour ago I closed the display my Macbook Pro. it goes into sleep mode. After dinner I returned, opened the display and wanted to continue with my work, but I recognized it was switched off completely. I tried to press the power button and received nothing. I also noticed that the green light on the power supply plug which is plugged into my Macbook is off. Same thing with a power supply from the Mac of a friend of mine. What could I try? Some suggestions? What could be the problem here?? I already tried using the battery to start, no success, also taking the battery out completely, no success. Even if I press the small button for showing the current battery charge, none of the leds starts. It's like the Mac is completely dead.

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• Printing to Power point

  - by manojpcw

  Hi, Similar to a print to pdf option, where we can choose PDF to be the output format when printing something, I am searching for something which can print to a power point file from a file. Is there any such plugin or tool? Also link to a relilable print to pdf tool would be helpful. This essentially would eliminate the export to power point option that the users are asking for. EDIT: I have asked this question in superuser: http://superuser.com/questions/134723/printing-to-power-point Thanks...

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• Fujitsu Siemens V6535 laptop doesn't wake up - crash when going into standby?

  - by marc

  I'm having trouble with my laptop (Fujitsu Siemens model V6535). It runs Windows 7, and after I upgraded from Vista I've noticed something that makes me really angry. When my laptop goes into Standby, the power LED changes to red and starts blinking (standby mode). When I push the power button to wake it up it, the blinking LED changes to green but nothing else happens. Nothing on the display, no HDD sound. When I press the power button for a few seconds and then try turn it on again, it doesn't display anything. I have to unplug the charger, shut it off, and power it on again without the power cable. Then it starts working. A few days ago I upgraded the BIOS to the newest version, but it doesn't help. Does anyone have any idea what can be wrong?

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• Best motherboard power supply combo for backblaze server

  - by jin14

  Building a backblaze server as described in this article. http://blog.backblaze.com/ So 45 hard drives in one box. I'm making it a MSDPM 2010 server so I actually don't even need raid cards in there as MSDPM will figure out how to use all of the hard drives on it's own. So need to know what motherboard, CPU, power supply I should get. Primary hard drive : SSD 128GB Storage : 45 1.5GB sata drives OS : windows 2008 Backup software : Microsoft System center Data protection server 2010 Need to know Which mother board to buy which will support 45 SATA hard drives. Don't need a raid card. Which power supply can power all 45 hard drives, 1 ssd drive, motherboard. Best set of equipment that meets my needs wins

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• How to Shutdown PC by Pressing Power Button

  - by AgA

  I always Hibernate my PC. Sometimes when I boot, it does not recognize the mouse/keyboard or any USB devices. I've also setup it to go in sleep in 5 minutes. In that case I can't restart the PC so that USB starts working. When I press the Power button then it starts shutdown but asks confirmation twice one is for shutdown by force confirmation and then there is one more. When my USB is disabled I can't input these options. So I switch off the power. What I want is that upon pressing Power Button it should at once start shutdown without asking any more confirmations System details: Win-7 Home Premium 64 bit Intel i3 530 Asus P montherboard EDIT: It is Desktop PC

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• How to disable the green power light on the Sony Vaio

  - by sri

  The Sony Vaio's green power light is extremely bright and very distracting! I can't even look at the screen without this power light being in my view!! Is there any way to disable it or reduce its intensity? Googling for "sony vaio disable green power light" (and similar combinations) didn't provide anything useful. I tried booting into the BIOS, but it didn't have an option for this. Also, the Viao Command Center didn't have any on it. I guess sticking a tape over the LED is the only option? Any help is greatly appreciated! Thanks!

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• HP Pavilion dv6000 QuickPlay power on

  - by user22559

  Hello I have a question for HP Pavilion dv6000 owners. If your laptop is powered down, and you press the QuickPlay button or the DVD button (NOT the power button), does the laptop start up? More info: I am asking this because I have got a hold of a broken HP dv6000. If I power it up, the power light lights up, and then the laptop powers down. It seems to be because of a broken motherboard. But the laptop does the same thing if you press the QuickPlay or DVD buttons, and I want to know if that's supposed to happen, or if it's something else that is wrong.

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• Fujitsu Siemens V6535 laptop doesn't wake up - crash when going into standby?

  - by marc

  I'm having trouble with my laptop (Fujitsu Siemens model V6535). It runs Windows 7, and after I upgraded from Vista I've noticed something that makes me really angry. When my laptop goes into Standby, the power LED changes to red and starts blinking (standby mode). When I push the power button to wake it up it, the blinking LED changes to green but nothing else happens. Nothing on the display, no HDD sound. When I press the power button for a few seconds and then try turn it on again, it doesn't display anything. I have to unplug the charger, shut it off, and power it on again without the power cable. Then it starts working. A few days ago I upgraded the BIOS to the newest version, but it doesn't help. Does anyone have any idea what can be wrong?

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• attach two hdds to a computer having 500W smps

  - by Gaurav Sharma

  I have a desktop system installed with a 250 GB hdd (seagate sata II) this system is having a power supply of 500W (not sure if it is 650W but not more than that) the power supply is a local brand. Will it be safe to attach a second 250 GB sata II hdd on the same system. Safe in the sense that the system may not fall short of power at any time. My system's config is as follows Core2Duo processor Mercury cabinet having an additional fan (small one) sata dvd writer 52X windows xp sp 2 ASUS motherboard (intel G965 express chipset) If the above specified power supply is not sufficient for above configuration of system then please suggest the appropriate power supply (including watts)

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• Bios wont post unless I restart power supply.

  - by remy

  I have an annoying problem with a computer. The BIOS wont post after it has been turned off and started again unless I turn the switch off/on on the power supply. The fans, cdrom hdd and everything starts running but the bios never beeps and the monitor stays black. I HAVE TRIED: reinstalling windows xp, flashed bios to latest, cmos clear, new power supply, other hdd, new memory sticks, graphics card. I also removed the motherboard from the computer case and laid it on a cardboard box and only connected the PSU, RAM and CPU. Other than this the computer works great but its annoying having to off/on the power supply switch before turning it on after its been off. My guess is that the motherboard is faulty but I would just like to hear what you guys think. Sorry for my english / Remy

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