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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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• 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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• What does the email header "X-CAA-SPAM" refer to?

  - by lotri

  I've got an application that sends out notification emails to users of the application (this is not spam; the information in these emails is solicited and useful, and is also a feature turned off by default and must be enabled by the user). The app is still in beta, and one of our testers reports that the notification emails are going to his junk mail folder in Outlook 2003. This is the only reported case of this, but I asked him to send me the email headers from the message, and I noticed that there is a header there labeled "X-CAA-SPAM" with a value of 00000 . I'm a programmer, so I'm fairly green in the world of successful automated emails - does anyone know if this header is the culprit? If not, any suggestions?

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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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• 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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• Can't restore HDD using multiple programs

  - by jonney

  Please refer to my original question about this issue. I tried GetDataBack and it doesn't seem to scan or do anything. I chose the default settings from the first screen and then on step 1 I chose my HDD that's damaged. In step 2, nothing happens. It doesn't scan or do anythong, and on step 3 it doesn't display any of my files. I have also tried TestDisk and what happens in TestDisk is that when I try to fix and rebuild the MFT, it says this: MFT and MFT mirror are bad. Failed to repair them. Here is the status of that HDD under Testdrive: I also tried this app and got no results when I tried to recover the files. I keep getting this error: Last but not least, I tried Recuva and that simply says it's unable to read the MFT. Any suggestions? I have tried various apps already and none of them seems to work.

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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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• 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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• 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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• Can I set up OpenVPN on two or more machines so that they can each act as client and server?

  - by ianfuture

  The question summarises what I want to achieve. In more detail: I have a Windows XP Pro PC at a work location that I want to be able to access my home Windows XP Pro PC and other home computers from. But I also want to be able to connect to the work PC from home. I think the term generally used is a "mesh" network. Can I do this with OpenVPN ? If so how would I do it? What are the most important things to remember to do? EDIT: The work Windows XP Pro PC is largely managed by IT Dept, I do have local admin rights to install things. Some settings are disabled. My main concern was firewalls and port forwarding on the work PC. 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Mac OS X: pushing all traffic through a VMWare VM [closed]

  - by bj99

  I want to set up an Astaro (Sophos) UTM in a Virtual Machine. The Setup should be at the end the following: Cable Modem (one IP adress) | [Ethernet] Sophos UTM (running as VM [VMWare Fusion 5] on the MacMini) | [WIFI] Airport Express v2 (for sharing Local Network to wireless and wired clients) 1)| [WIFI] 2)| [Ethernet over Thunderbolt Ethernet Adapter]* Clients MacMini (Local File Server) *To have the Mini also protected behind the UTM So the setup process for the UTM works fine, but then the problems start: I just have one external IP (from my cable modem provider)== So if I put the VM in briged mode my Internet connection drops, because the MacMini also has its IP adress. If I put the VM to NAT mode the Mini itself is not protected by the UTM So: is there a way to hide the en0 interface(Ethernet) and the en1 interface (Wifi) from the MacMini, so that they not even appear in System Preferences Network section but are available to the VM? That way the Mini must connect to the en2 interface (Thunderbolt adapter) to make any Internet/LAN connection and I just use the given single IP from the Cable Modem. Thaks for any suggestions... Sebastian

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• Macbook Pro keyboard with BootCamp - missing the Home/End/PageUp/PageDown keys

  - by brainjam

  Last year I converted from Windows to a MacBook Pro and went through the process of learning the ways of the Mac keyboard. In particular, I learned that Ctrl-left and Ctrl-right were the Mac way of doing Home and End. I'm now doing a project on Windows 7 on Bootcamp, and finding that I'm missing the Windows Home and End keys in a completely different way -- they don't exist, but the Mac combos don't work either. Any suggestions for getting this functionality somehow? Code editing is a real drag without these keys.

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• Good default for XDG_RUNTIME_DIR?

  - by cadrian

  The XDG Base Directory Specification is a very interesting spec for user directories. It also provides good default values, except for XDG_RUNTIME_DIR. Now I am writing a software that needs to create named pipes. It is a per-user client-server framework (there is a FIFO for the server and a FIFO per client). If XDG_RUNTIME_DIR is not defined, I am currently using a per-user subdirectory in /tmp — but it does not ensure all the specified conditions (viz. the paragraph starting with "The lifetime of the directory MUST be bound to the user being logged in…") Is /tmp/myserver-$USER good enough? Edit I saw elsewhere a few suggestions: . is quite unsatisfactory (at least because it is not an absolute path). I also saw /var/run/user/$USER — not bad, but that directory does not exist (at least on my box running a Debian testing)

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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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