Ubuntu Servers :: How To Configure Kernel For A Many-processor Machine
Jan 2, 2011
I have Ubuntu 10.10 Server installed on a 32 core machine(quad AMD Magny Cours 6128 ), and I was wondering what kernel configuration would optimize its performance?So far, I have only found the obvious configurations that are checked off:
1) Processor type and features ---> Support for big SMP systems with more than 8 CPUs
2) Processor type and features ---> Maximum num of CPUs
3) Multi-core scheduler support
Is there anything else I should consider?I plan on running multi-threaded programs with moderate amount of inter-processor communication, shouldn't there be some options related to the shared memory?
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Aug 15, 2010
Today when I logged into my fileserver it told me there were 20 updates available. I went ahead and installed them, one was a new kernel. After reboot, I cannot see that machine when I browse the network. It still has the same static IP and I can still map to the shared drives, so Samba is working. When I browse the network from Windows or my WDTV Live media play it no longer shows the server by name. The smb.conf file is still intact and I restarted Samba. Not really sure where to start troubleshooting why I can't browse to it.
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Jun 29, 2011
What is the best way to determine in Linux if a multi-processor machine is overloaded? I thought load was a good measure but I run a large number of tasks which don't consume a lot of CPU but which drive up the load. A 4 processor machine has a load of 66 right now according to top for example but mpstat reports that the all CPU idle time is 89%.
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Jun 4, 2010
I have been looking at things with the uname command and was wondering if you can install a system with 64/32 bit when it was actually not the one you installed (e.g. you install a 64 bit OS on a 32 bit comp). I was basically wondering how to tell what type of hardware I actually have instead of what the Debian package installed. (In order to ensure that I am running the hardware the way it was designed.) At the moment, I am looking at my processor (uname -p returns "unknown") and the machine build (uname -m returns i686).
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Jun 30, 2011
I have a multi-threaded app using pThreads that runs great under Windows on my 4 core machine - all four cores get maxed out processing parts of a large file. I recompiled the same code to run on Red Hat linux on a 64 CPU machine - but from I can tell when it runs - it gets stuck on one core. "mpstat -P ALL" shows the cores are barely loaded. I have tried sched_affinity, sched_priority and SCHED_FIFO - nothing has helped. Any ideas on getting more performance?
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Jul 29, 2009
I successfully installed the virtual box on my fedora 8 system, and also created a virtual machine with windows xp OS, it works nicely, I try to configure the serial port of my virtual machine and try to configure the path for the port "screen shot are attached" it gives me the error message also the "screen shot are attached" for your review.Is kind of mistake is going on during the path setting, and how to set the path for configuring the serial port of my virtual machine so that I can use the hyper terminal tool of windows.
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Jan 28, 2010
I been havin a problem whit the installation of fedora 12 on virtual pc, gives me the error:
"An unrecoverable processor error has been encountered.The virtual machine will reset now."
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Dec 19, 2010
I've downloaded the Ubuntu Server 64AMD version. Will this work with an Intel Xeon processor? I've an old SuperMicro 1U Server X5DPR-8G2+ Xeon Dual 2.8GHz/1GB I'd like to use. Will Ubuntu Server work with this or do I need the 32bit version?
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Jan 5, 2010
i have installed ubuntu in my laptop.since i have AMD processor fedora doesnt support AMD processor..the recent version fedora 12 supprots AMD processor.i am doing my final project in ns2 hence it should support tht too!!! Which is the best choice to override ubuntu grub fedora 12 or redhat linux.
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Feb 10, 2010
If I have SMP kernel would it work with single processor or only work with multiple processors system?
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Dec 13, 2010
I got the error: "An unrecoverable processor error has been encountered. The virtual machine will reset now." I have edited the options in installation screen with adding noreplace-paravirt at the end of boot parameters. but still have this error and FC installation does not continue.
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Jan 10, 2010
I have a machine running Karmic sat in the corner of my office. I scp stuff from my mac to it quite a lot over my local wireless network.At the moment, it holds a .sparsebundle backup of my mac created by SuperDuper! (mac backup application) that I periodically transfer over. I'd like to make this system a little more sophisticated and use Apple's Time Machine to automatically backup to my Ubuntu box if possible.
Anyone have any experience of this? I'm kinda hoping for something a bit more straight forward than this: http:[url]....
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May 20, 2010
I'm running Ubuntu Server 10.04 and have a secure (SSL/TLS) FTP server on it. However, I'd like to use this FTP server to update programs I made using Microsoft Visual Studio. Unfortunately, in Microsoft's infinite wisdom, secure FTP servers cannot be used. Rather than use an insecure FTP server, I want to set up my secure FTP server to be able to access whatever I need to on the machine, and then add an insecure FTP server that only has access to the directory where I put my update files. I am currently using vsftpd as my FTP server. Is there any way that I can set up two FTP servers on this single machine?
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Dec 11, 2009
default in openSUSE 11.2 we have installed kernel-desktop. This kernel is optimized for the desktop.
What is the name of kernel optimized for server machine? In my case Firebird database + Apache + PHP?
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Apr 23, 2010
I have been working on this for about 4 hours so I am extremely frustrated. I am trying to access windows shares from my linux box. I will worry about getting my own data shared afterwards.
I was having the authentication problem described by swerdna's sticky, and it was solved by the upgrade. However apparently that is not the main problem. samba is trying to use my ISP's DNS to resolve the internal network names. I have a vague conceptual understanding of WINS and NetBIOS - but Windows does this without any extra steps. Do I need to configure my machine to also act as a WINS? how do I do that? In my searches I found a thread about "why do windows to linux users give up?" this is why.
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May 12, 2011
How do you configure a Windows (preferably latest version) machine for a Linux power user, so that s/he can get most out of it?if all you have to add is a one-liner, your answer will be converted to a comment.
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Mar 16, 2011
How do i configure my linux machine to send mail. I have two server out of which one is configured to send mails. However The other is still not sending mails .I have installed sendmail rpms and modified
sendmail.mc file to include following parameter.
[Code]...
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Oct 7, 2010
I'm working on a script. fter it has installed and removed packages, I need to configure a ton of settings. In GNOME, I understand that those settings are kept in "/home/user/.gconf". Can I create a virtual machine and configure the system through the GUI to my liking and then dump all of the settings, so that I can load them on another machine? Is it as simple as copying the directories?
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Oct 18, 2010
how does one configure a Ubuntu 10.4 machine to write its logs to a syslog server?
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Nov 3, 2010
I recently installed vsftpd on my server. I noticed that users on the machine can login into vsftpd with their username and password on the machine and go to their root dir "/home/username".Now, I want to give some people a vsftpd username and password so they can upload and download files and folders to their folder, but this folder has to be in the "/var/www/(username)" folder. I don't want them to be able to go to any other folder than their own folder like "/var", "/etc" or "/home" etc. Also I don't want them to be able to login on the machine as a user, through putty for example. They should only be allowed to acces their folder with vsftpd, nothing else.
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Mar 11, 2010
How to configure the KDE Konsole that when I press on a "new tab" button, the new shell would open on another machine (thorugh ssh), and not on the current one?
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Jun 3, 2010
How to install kerberos on a local machine...?
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Jul 6, 2011
can any one provide the steps to install and configure Nagios in Redhat Linux machine?
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Nov 1, 2010
i hav configure dhcp server. but the ip is not getting assigned to my client machine.
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May 24, 2010
how can i configure a samba server?. im using a machine with fedora and a windowsXP machine.
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May 9, 2010
How do I configure my machine to load specific modules at startup.
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Feb 24, 2011
I'm trying to setup and configure a server entirely with text only run mode 3 on a virtual machine so I can redo my current live server. I'm now trying to set up the firewall of the system using iptables. I've read up on it and came up with the following:
-clear all rules
#iptables -F
-set default policy rules
#iptables --policy INPUT DROP
#iptables --policy FORWARD DROP
[Code]....
Everything above worked for me but just out of interest I looked at my live server which was configured using a GUI. I ran iptables-save and it was pretty much the same but its port open lines read like this:
#iptables -A INPUT -p tcp -m state --state NEW --dport 80 -j ACCEPT
so finally my question is do I really need the "-m state --state NEW"? Wouldn't having that drop established connections on those ports? I'm just confused as to what exactly the NEW state is doing and would it make a difference if I didn't include it.
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Mar 29, 2011
How can i configure an openCA and openOCSP server on a linux virtual machine?
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Sep 2, 2010
I recently installed Fedora 13 to learn more about it. I am new to this particular Distro but not completely new to Linux. After I installed Fedora 13 I did yum update and after it was finished I discovered that the i686 PAE kernel installed. I am not opposed to the PAE kernel being there and I read a little bit about it on various websites...
As far as I can tell it only actually addresses more than 3 GB of RAM if the software you are using is made to run on more than 3GB of RAM. BUT my question is this: is there any software at all in the ordinary set of desktop packages that would in any way benefit from having, for example, 8 GB of RAM in a 32-bit system running a PAE Kernel?
For example, running Audacity, Rhythmbox, an Open Office Document and Firefox I have never found that there was any real lag or problem with having only 3 GB of RAM... so what is really being added with the PAE kernel to a desktop system.
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Feb 26, 2010
i am having quite a problem after upgrading my karmic to an 2.6.33 kernel and trying to do an nfs transfer.
the nfs transfer bugs out in (and then freezes the box totally up, so that only pressing the reboot button on the pc itself helps anymore):
Code:
Feb 26 22:31:24 localhost kernel: [ 3964.123290] INFO: task rdesktop:10331 blocked for more than 120 seconds.
Feb 26 22:31:24 localhost kernel: [ 3964.123292] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Code].....
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