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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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• 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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• tag based file organizer

  - by Richie

  I'm finishing professional school and over the years have acquired a pile of notes and articles that I'd like to hang onto. I'd like to add to them and create sort of an archive of article and files that may be useful down the road. I'd also like to organize this collection of files not only by simple grouping but also with tags. I feel like that will make searching through them years later much easier. Suggestions on software that would be good for this? Just a general file manager, something that uses tags that can be attached to each file? Thanks

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• Looking for an open source email archiving application

  - by Joel

  I'm looking for an open source application that will archive my email. It might do this by logging in to my POP3 account on a regular basis and copying the emails across, or it might just read my Unix mbox/maildir file/directory directly on the mail server. It must be open and it must run on Linux (or any open OS actually). Ideally, it would have a web interface, but this is not a major requirement. MXsense (http://www.mxsense.com/mxsense.html) seems to be pretty-much what I want, except it's not open. I have no requirement for MS Exchange support. Any suggestions? The rationale (maybe a bit silly) is that I run Linux exclusively and it's still doesn't have an email client that is anywhere close to MS Outlook in terms of awesomeness, so I find myself switching between mail clients often. I would feel better about this if I had an archive of my emails, so it wouldn't matter which mail client I was using this month.

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• Apache: domains working fine, subdomains not working anymore

  - by David Lawson

  Hi there, I'm not sure when, but suddenly subdomains aren't working on my server. e.g. www.davidlawson.co works, but david.lawson.co isn't working. <VirtualHost 173.203.109.191:80> ServerAdmin [email protected] ServerName david.lawson.co ServerAlias davidlawson.co ServerAlias www.davidlawson.co DocumentRoot /var/www/lawson/david <Directory /var/www/lawson/david/> Options -Indexes FollowSymLinks MultiViews AllowOverride All Order allow,deny allow from all </Directory> ErrorLog /var/log/apache2/lawson/david/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/lawson/david/access.log combined </VirtualHost> Any suggestions on how to debug this further, or what the problem might be?

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• Convert from port numbers to protocol names in wireshark

  - by Berkay

  i'm simply using tshark -r botnet.pcap -T fields -E separator=';' -e ip.src -e tcp.srcport -e ip.dst -e tcp.dstport '(tcp.flags.syn == 1 and tcp.flags.ack == 0)' to see the all initiated "legal TCP" connections. However, i need the destination port number conversion to "http" "netbios" etc. i'm not using -n option, but still i get: 128.3.45.128;62259;208.233.189.150;80 This is what i'm trying to get: 128.3.45.128;62259;208.233.189.150;http or 128.3.45.128;62259;208.233.189.150;80;http is better option for me. any idea from tshark users? or any other tool suggestions?

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• Nearest PC equivalent to Mac Target Disk Mode?

  - by username

  Mac firmware has a special boot mode that allows you to offer its internal hdd to another computer as an external disk (you just connect the two machines via an IEEE 1394 cable). Only the second machine needs a functioning OS installed. Any good suggestions for something similar on the PC side of things? Block level access isn't important to me, I'd just like to be able to copy files off it. It doesn't matter to me if it uses Ethernet, IEEE 1394, or wifi - I just like having a quick way to access files on a client PC. Is there any single-purpose Linux distro specially designed to do this? It'd be nice to have something super simple, quickbooting, and small that I could install on a USB drive. I used to use Knoppix, but it's overkill as a Target Mode replacement.

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• Can I repair a short circuiting problem in a Dell Inspiron 6000 that occurs when it is picked up?

  - by jim.e.clark

  I have a couple of Dell Inspiron 6000 notebooks that work perfectly fine unless you pick them up by one corner (as most people would). When you lift the notebook it flexes slightly and the notebook shorts out. Sometimes even a gentle bump will cause this to happen. So far the notebook always starts back up without issue, but this behavior is...inconvenient. It occurred to me that someone familiar with the innards might be able to suggest a little MacGyver fix for this. A little electrical tape in the right spot or something like that. Or perhaps this is a common problem and the answer is here, waiting for me to stumble on the correct keywords. I would appreciate any suggestions Note: It is probably worth mentioning that I have disassembled a Dell notebook before to replace a bluetooth card so I comfortable opening up the systems.

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• Color Profiles in Windows 7 vs. XP

  - by flxkid

  I have a Brother Color Laser Printer and an HP 8150DN. I have a local Windows 7 Pro machine that I do graphics work on. I created a letterhead that when printed from my machine looks dark and rich on either the mono HP or the color Brother laser. I take this same letterhead, and move it onto our network for use by our users which are all on XP. Then they print the same file, it is washed out on either printer. I've confirmed that the printer settings we're using are identical. I've confirmed that its not related to the program or even specifically to the letterhead. I can duplicate this with other files too. I'm down to XP vs Windows 7 being the issue. I'm fairly certain now that color profiles are involved. I have no clue how to fix it though. Any suggestions would be much appreciated.

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• Ubuntu 9.0.4 Presario S4000NX Fan Speed

  - by Chris C

  I recently install Ubuntu 9.0.4 on a Presario S4000NX and the CPU fan speed is kept at max. With Windows XP installed the fan speed would increase/decrease as required. I've tried to install lm-sensors and run the sensors-detect. It recommended that I load the modules which I did: smsc47m192 i2c-i801 When running sensor-detect it gave me this strange message: Trying family SMSC Found SMSC LPC47M15x/192/997 Super IO Fan Sensors (but not activated) Running the sensors command gives me a list of voltages and CPU and temperature but doesn't list any fans. After doing some Internet research I then tried to load the smsc47m1 module but I get the following error: FATAL: Error inserting smsc47m1 (/lib/modules/2.6.28-15-generic/kernel/drivers/hwmon/smsc47m1.ko): no such device The file smsc47m1.ko does exist in the listed folder. Any suggestions for getting the fan speed (and the noise) down in Ubuntu? Thanx. - Chris P.S. - I would have put better tags but Server Fault wouldn't let me.

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• Problems installing Linux to IDE connected compact flash card

  - by mathematician1975

  I have been trying to install Ubuntu on some hardware (Netcom NC-499 board that contains a Vortex86DX processor). I am trying to install to a compact flash card attached to the board via an IDE adaptor, the aim being that the board will boot up and simply treat the compact flash like a normal hard drive. The processor vendor claims support for Ubuntu 10.04 but I am having problems installing it onto the card. I have been trying using a USB CD-ROM drive and the standard .iso image from the ubuntu site (md5 checksum works out fine so no problem there) but I have had no success at all. I have been able to do this with Ubuntu 8.04 but with no other version (9.04 and 10.04 desktop and alternative discs all fail). My question is what other options are available to me to try and install this? I have googled myself apart trying to find out but other than a few sites describing USB based installs using flash memory sticks for very specific hardware, I have found no useful info at all. Any suggestions will be gratefully received.

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• Prevent redirect loop in mod_rewrite

  - by user280381

  I'm writing a rule in my htaccess that basically says this: If the request is for the homepage And a cookie has not been set Rewrite the page with /addCookie.php Then in addCookie.php, we set the cookie and redirect back to the homepage. This is all fine, but if the user doesn't accept cookies, we get an infinite loop of redirects. I'm new to mod_rewrite, I've done a lot of searching, but can't break the loop. I have this so far: RewriteCond %{ENV:REDIRECT_STATUS} 200 RewriteRule .* - [S=1] RewriteCond %{REQUEST_URI} "^/$" RewriteCond %{HTTP_COOKIE} !device_detected RewriteRule ^ addCookie.php [L] Is what I'm trying to do possible? I could add a query string on the redirect from addCookie.php, but I'd much rather keep the requests identical. Any suggestions kindly welcome.

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• How could I safely fix my walking "dead pixel" bug?

  - by Cawas

  I need suggestions. I've got a live little bug inside my macbook pro screen for 2 days now. I've tried to film it using my iPhone, but it ain't that good. :( Should I try to open it? o_O C'mon, looking for ideas here! :) edit: Here's an alike video. It's not moving anymore for now... I hope it isn't dead! Right when I've found a possible solution along with many ideas on that link: suction cup; monitor off and lamp on to attract it out; scratching the screen (made it move a little); and got to know there's no warranty for this "feature" (also known as bad design in a jargon). edit2: It's been "fixed" on its own. Just check the answer.

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• Linux certification

  - by nitins

  I have been working in Linux administration for 2.5 years. I would like to have a certification in this. Yes RHCE is an option. I think already know most of the RHCE stuff. But I would like to have some thing advanced. I ready to for a full time course as I not getting the exposure in my current company. Please give me suggestions about training/courses ? I find a couse RHCA(Architect). Need to know if this is good ?

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• converting huge MPEG audio files to something smaller

  - by john

  I've got some large MPEG audio files (144 MB each) that I'm looking to convert to something smaller so I can send them out as attachments to an email. Any suggestions on the software to use? I'm looking for something free that will run on Windows. I don't really care what the destination file is, mp3 would be nice. If there's a web service out there that would do this without the need to download any software to my machine, that would be even better, but I would be more than happy just getting it done any way I can. Thanks!

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• How to free port 80 for xampp to work

  - by Alfie

  Please help, I used to be running xampp and it was working perfectly. Then I wanted to try something out and I ran IIS instead of xampp. Now I want to go back to using xampp, but whenever I try to run the apache server it says: Busy... Apache started [port 80] If I go to http://localhost/ then it just says that it can't establish a connection to the server. I have turned off IIS, so I don't see why it shouldn't work. Any suggestions?

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• subdomain/virtualhost problem on unix + apache

  - by Aaron

  Hello, I'm having a strangely difficult time setting up a subdomain (x.example.com). The main site works fine, but I get 404 errors attempting to hit x.example.com no matter how I set up the VirtualHost config. NameVirtualHost *:80 <VirtualHost *:80> ServerName www.example.com DocumentRoot /var/www/example.com/htdocs ServerAlias example.com </VirtualHost> <VirtualHost *:80> ServerName x.example.com ErrorLog /var/logs/x-error-log CustomLog /var/logs/x-access-log common DocumentRoot /var/www/x/htdocs </VirtualHost> As far as I can tell, this is a vanilla set up. Any suggestions would be appreciated.

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• Advise on VMWare hardware requirements and host OS

  - by edwin.nathaniel

  Hi All, I'm a newbie developer wanting to learn a bit about Virtualization (from the IT point of view, not theoretical/academic). What I'd like to do: Prepare a machine Install VMWare or VirtualBox Prepare 3 Guest OSes (one for Win2k8 server, 2 for Ubuntu Server) Win2k8 will run SQL Server 2k8 and IIS (for ASP.NET MVC deployment) 1 Ubuntu Server for Drupal, SugarCRM, MediaWiki, typical LAMP stuff 1 Ubuntu Server for Java (Tomcat/Jetty + MySQL/PostgreSQL) What I'd like to know: What would be the ideal Host OS such that the Host OS should not spend too many resources on itself but should boost these instances of VMs (e.g: does Win2k8 performs better vs Linux?) What would be the ideal machine for this (preferably AMD base chip) I'm not expecting the best performance out of this setup, just a decent one to host one drupal instance, one ASP.NET MVC (future, not now), and one Tomcat/Jetty instance. NB: If you have a better suggestions on the setup, feel free to let me know (e.g: maybe Drupal and Tomcat can be in one instance but move the database to another instance instead of 1 instance map to 1 webserver and 1 dbserver). Thank you.

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• site timing out when under heavy load

  - by naunu

  My client sends out eblasts at 8am monday/wed/friday. Between 8:15-8:45 the site becomes extremely slow and many users sessions timeout. My setup: Mediatemple VE 2gb dedicated ram (3 burst) Ubuntu 9.10 Apache2-mpm-worker PHP5.3-fcgi MySQL 5 I recently tried to remedy the problem by switching from apache2-mpm-prefork to mpm-worker, but am still having the same issues. My apache settings are: Timeout 100 KeepAlive On MaxKeepAliveRequests 100 <IfModule mpm_worker_module> StartServers 12 MinSpareThreads 25 MaxSpareThreads 96 ThreadLimit 96 ThreadsPerChild 25 MaxClients 225 MaxRequestsPerChild 0 </IfModule> The site is only getting ~10,000 page views during the 8am-9am hour, which I dont think should be stressing the server too badly. Maybe it is an error with the PHP settings, or bandwidth per unit time, or the site outgrew the server? Any suggestions would be very helpful - as you can see i've given it a good go before looking for help (installed mpm-worker). Also, can anyone suggest to me some free load testing software, or a tutorial on mod_status? Thank you

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• off-the-shelf HDD in Dell Optiplex 755 - Invalid Replacement - Press F1 when rebooting

  - by Eric Liprandi

  I recently put an SSD into my work Optiplex 755. Since then, every time the system boots or reboots, I get prompted to hit F1 to continue with a message like HDD replacement is not valid. The system works just fine. What I am gathering from Dell's website is that I left the original drive internally as a data drive. And apparently the Optiplex does not support 2 drives in the configuration we purchased originally and complains. Any suggestions on how to get rid of this message? some suggested the MEBx or whatever from Intel and to turn it off, but I did not succeed earlier. It's not a big deal 80% of the time, but I regularly work from home and occasionally need to fire a reboot and well, you don't get the BIOS screen remotely :) Regards, Eric.

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• Getting rid of Plesk on a VPS

  - by TomA

  I've been using a relatively expensive VPS for hosting about 30 domains and I want to migrate to a cheaper one, without Plesk. Both use CentOS. My users will not care, they don't use Plesk anyway. But I will not be able to use it for creating new virtual hosts, FTP accounts etc. I'm not a commandline guru, esp. not in a server environment. Is there a free Plesk alternative for these purposes? I need to: Create a new virtual host with it's own FTP account Setup some basic FTP quota I don't need: DNS management (the new VPS service has an external DNS management GUI) Mail server management (I use Google Apps) Any suggestions welcome, from Plesk alternatives to "RTFM" or links to tutorials.

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• Postfix dynamic smtp_helo_name

  - by William

  I have a mail server that relays e-mails for two different domains. I want the smtp_helo_name to be different based on the domain. I'm assuming there is no way to do this via checking the mail headers, so I was wondering if there was a way to do it by sending mail for one domain to one IP, and mail for the other to another. I tried modified master.cf to do this: localhost:smtp inet n - n - - smtpd ip1:smtp inet n - n - - smtpd ip2:smtp inet n - n - - smtpd -o myhostnamee=example2.com And setting smtp_helo_name to $myhostname in main.cf I also tried doing -o smtp_helo_name instead, neither work. Any suggestions would be great. Thanks

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• Unable to mount portable hard drive on Ubuntu

  - by VoY

  My portable hard drive (WD My Passport), which used to work correctly now does not automount on my Ubuntu system. It does work on a Windows machine or even when plugged into WD HD TV, which is a Linux based device. There's one NTFS partition spanning the whole drive. When I plug the disk in, I see the following in dmesg: [269259.504631] usb 1-2.2: new high speed USB device using ehci_hcd and address 20 [269259.604674] usb 1-2.2: configuration #1 chosen from 1 choice However it does not mount in GNOME and I don't see it when I type: sudo fdisk -l Any suggestions why this might be? I repaired the partition using chkdsk on Windows, so the issue is probably not filesystem related.

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• Remote Desktop settings not being applied for user

  - by Anthony K

  We have a number of Win 2003 servers for which we have Remote Desktop enabled. Each user has their profile edited so that they can only connect for 2 hours maximum and have 30 minutes idle time, after which they are disconnected and the session closed. On one server however, the administrator account does not have the maximum session limit working. We can stay connected for days if we want. Originally this was how it was setup, and we later changed the profile for all users so that there are limits. We have rebooted the server a couple of times since, and the Management Console shows the limits. If we are idle for too long we are disconnected. Other users are having all the limits observed. Any suggestions?

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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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