Ubuntu Servers :: Dual Socket X5550 Platform With Hyperthreading Disabled - Bad Scheduling On Nehalem?
Feb 25, 2010
I'm running Ubuntu Server 9.10 on a dual socket X5550 platform with hyperthreading disabled. There should be 8 cores available for running processes: dual-socket, quad-core. When I start 8 single-threaded, cpu-intensive processes running, top shows six processes running at 100% and two at 50% (presumably sharing the seventh core). No other processes are reported as having >1% cpu, and yet the 1-minute load average is listed as over 11.0?!
1) Why is it not running each process on its own core?
2) Why is the load average so much greater than 8?
3) Is there anything I can change in the configuration to fix this?
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Dec 15, 2009
I just installed a new HP DL360 with 32 GB of RAM and a Intel Xeon X5550 which supports speed stepping and turbo mode. I've enabled turbo in the BIOS, but cannot seem to get CentOS 5.4 to make use of either of these features. I've been googling for a solution for a while now, and tried various things, such as installing cpufreq. However, when I type cpufreq-info, I get this:
# cpufreq-info
cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
[code]...
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Apr 20, 2011
Being on a low budget and I can't afford to buy Redhat would you recommend using Fedora for setting up dedicated servers? I know Fedora is known to be "bleeding edge" in technology, which concerns me with the stability of the server. Would you recommend a more stable Linux distro? I was also wondering if there is any way to know what these web hosting companies are using in their servers: [url]
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May 31, 2010
I am/was(?) running a dual boot Windows 7 Home Premium and Fedora 12 system on an AMD Phenom platform.
I thought that I would try the KDE desktop and installed it with the command
yum groupinstall "KDE (K Desktop Environment)"
After tasting KDE for a while I decided that I far prefer Gnome.
I removed the KDE with
yum groupremove "KDE (K Desktop Environment)"
This appeared to work but I then found that whilst I can boot into Windows 7, I can no longer boot into Fedora 12.
I have tried booting the F12 DVD and going into to the Rescue function. I re-installed grub but still cannot boot into F12.
I have looked at grub.conf but can see nothing wrong.
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Mar 12, 2010
I want to run 4 instances of a Virtual Machine on a Dell Power Edge 7401 machine want to know which Virtualization platform will help is there any performance compatibility test some where so that I can understand it.
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Jun 13, 2011
I consider building a new computer using a mainboard with support for two processors. I wish to do this to improve performance of course, specifically in regards to audio production. Though, what I would like to know is if anyone has some experience with using such a hardware on an ordinary desktop system and if there are some general implications I should be aware of?
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Sep 2, 2010
I recently installed 10.04 and really like it so far, however I was wondering if it is possible to scale all hypertheading cores at once, currently I am using an applet for each and have to use several clicks to get into the desired powerstate.
I have read that with dual cores you will not have the option to go into different powerstates because it scales all cores at once, however the logical cores that show up with hyperthreading allow each to have a different power state, and will show up as different states if I use cpufreq-info in the terminal, so it seems like it is allowing it.
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Mar 16, 2011
I am fairly new to ubuntu server, I want to setup a tftp server to mount a new kernel in a DaVinci platform. I was following the guide in this page [URL]..docs/linux_tftp, but accidentally I remove the xinetd.conf file. So I think that maybe removing and reinstalling xinetd the problem will be solved, but instead of that I can't completely remove xinetd and the follow message is print in the terminal
Removing xinetd ...
invoke-rc.d: unknown initscript, /etc/init.d/xinetd not found.
dpkg: error processing xinetd (--remove):
subprocess installed pre-removal script returned error exit status 100
invoke-rc.d: unknown initscript, /etc/init.d/xinetd not found.
dpkg: error while cleaning up:
subprocess installed post-installation script returned error exit status 100
Errors were encountered while processing:
xinetd
E: Sub-process /usr/bin/dpkg returned an error code (1)
with that problem I can't start the service or stop it, I am blocked in the configuration of tftp server.
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Feb 28, 2010
have only been able to find instructions to enable HyperThreading on legacy versions of Grub, but not Grub2.
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Mar 22, 2011
Some time ago I've opened a thread about ACPI - as it turned out - killing my server. You may read it here if interested.My question is how can I enable Hyperthreading support in my kernel without enabling any part of ACPI?(Boot flag acpi=ht causes the same issue as described in above thread, so enabling any part of ACPI in any manner is not desirable)My kernel:
[root@sheridan ~]# uname -a
Linux sheridan.******** 2.6.35.11-83.fc14.x86_64 #1 SMP Mon Feb 7 07:06:44 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
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Sep 22, 2010
ted my old laptop with windows xp home ed and Fedora (xp was installed first). When I boot to Fedora OS to fill in initial settings (user name, password, network etc) to get it up and running the mousepad doesn't work (there is no cursor). It still works fine in Windows.Anyone know how to get this sorted? The laptop is an HP Pavillion ze2000. No external USB mouse or similar has been used.
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Sep 16, 2010
I'm writing a client-server program. There are more than 500 clients. I start a thread to process and response to each client and the processing needs some MySQL query. I'm looking for any possible hazards on my server!
1- Any limitation on "Maximum Simultaneous Socket Connection"?
2- Any limitation on using mysql?
3- As socket on Linux are file, Any limitation on number of sockets or threads?
I'm using a Linux server (Centos or Fedora or Ubuntu) and clients are both Linux and Windows.
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Nov 21, 2010
I have a new install of Ubuntu 10.04.1 LTS server. But I get errormessages trying to start samba.
caesar@klem:/etc/samba$ restart smbd
restart: Unable to connect to system bus: Failed to connect to socket /var/run/dbus/system_bus_socket: No such file or directory
I have tride to remove an install samba. And deleted smb.conf. And startet with the original.
smb.conf:
workgroup = Easyways
server string = %h server (Samba, Ubuntu)
log file = /var/log/samba/log.%m
max log size = 1000
[Code]....
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Mar 24, 2010
I've read there is a way to communicate without tradtional TCP/IP programming on Redhat Linux and Nehalem CPU with ethernet. I've tried to collect some related information with sample program codes, but failed to collect useful information.
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Jun 21, 2011
the only issue that i have: the wireless is always disabled.
when i install new updates, the wireless comes back enabled and everything is fine but when i restart ubuntu its disabled again !!
i have a DELL studio 1537 laptop (broadcomm wifi card)with a win7 service pack 1/linux ubuntu 10.04 LTS dual boot.
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Mar 9, 2010
I've got a dual Xeon 5570 (Nehalem) server. It clocks down properly, but never, under any circumstances that I've found, clocks up past its TSC. Even when running basically nothing but cat /dev/zero > /dev/null, nothing gets clocked higher than the TSC. Below is the turbostat output, which clearly knows what the hardware is actually capable of, but it never actually achieves it. I'm running Lenny, with backported kernel 2.6.30-bpo.2-amd64. I tried the 2.6.32 backport and there wasn't any difference. know where I should look next? BIOS settings? Do I need to change some kernel option and recompile?
# ./turbostat
Nehalem multiplier 22, TSC frequency 2933 MHz
Nehalem 4 cores active: 24 mult, max turbo frequency = 3200 MHz
Nehalem 3 cores active: 24 mult, max turbo frequency = 3200 MHz
Nehalem 2 cores active: 25 mult, max turbo frequency = 3333 MHz
Nehalem 1 core active: 25 mult, max turbo frequency = 3333 MHz
[Code]...
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Jun 4, 2010
I want to configure socket timer to release socket(port) once the connection is terminated. Do we have something in Linux OS to configure this delay to release socket?.
Any command, link or man-page anything will be helpful.
I browsed a lot but unable to find it.
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Dec 7, 2010
Anyone knows the difference between a socket and TCP connection for connecting to an external system?
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May 5, 2009
I had installed Fedora 10
Below is the output of uname -a
Linux 2.6.27.5-117.fc10.i686.PAE #1 SMP Tue Nov 18 12:08:10 EST 2008 i686 i686 i386 GNU/Linux
I need to enable telnet service on it, then found xinetd and telnet-server not installed,
Then I had installed below
First I had installed Xinetd: xinetd-2.3.14-21.fc10.i386.rpm
then I had installed telnet-server: xinetd-2.3.14-21.fc10.i386.rpm
After installation I executed below commands
Service xinetd start
Chkconfig xinetd on
Chkconfig telnet on
Service iptables stop
Chkconfig iptables off
Iptables �F
After I had tried telnet localhost ----IT FAILED
when I run telnet server manually by issuing the below command
/usr/sbin/in.telnetd, I get below error
[COLOR="Red"]/usr/sbin/in.telnetd: getpeername: Socket operation on non-socket[/COLOR]
I have other system running same OS, I had followed the same steps discussed above to enable telnet, It works fine on it.
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Dec 8, 2010
figure out this error?
Code:
kradalby@hpcompaq6530b-laptop ~/.ssh $ ssh -vvv -p 110 kradalby@dfekt.no
OpenSSH_5.5p1 Debian-5+b1, OpenSSL 0.9.8o 01 Jun 2010
[code]....
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Apr 2, 2011
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2). I've had this problem to the point where I thought I messed up my actual configuration so bad that I reinstalled Ubuntu to get rid of all the MySQL configuration; I ran MySQL through Windows with a breeze, but I'm getting some errors like that after restarting my computer just a few minutes ago and I have not changed anything in my SQL settings. I'm on Ubuntu 10.10 64 bit and running MySQL 5.1. the actual error that I get from Navicat and from the website is at [URL]... Update: 20110402. Connection for controluser as defined in your configuration failed. Just got that when I tried to log in to phpmyadmin.
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Feb 23, 2010
I have installed Ubuntu KK server, and when I turn on my machine without monitor, after 5-7 min - system stop and not responding on all my requests (network, keyboard.). With enabled monitor all work good.
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Nov 18, 2010
i just installed frox ftp proxy for my server using apt-get install frox.after i installed it i did 'sudo /ietc/init.d/frox start" and got t this "starting frox:caching ftp proxy server: disabled"
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Jul 6, 2010
i'm writing a simple program of client socket program. Here below is the code sample which i'm writing...
Code:
//tcp_client.c
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include<string.h>
#include<stdlib.h>
[Code].....
the above code works fine.if we copmile and run ./a.exe 192.xx.xx.xxx 1111 and press enter it works fine..everytime it asks "Please enter the message: " and if give that will be displayed in server. but my problem is i dont want to print everytime "Please enter the message: " i just want to feed some words one by one to the socket.
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Mar 30, 2009
im getting that error in my code for some reason. I compiled my code, and when i try to run this server it throws me an error on my call to setsocketopt(). The only way it can reach that part of my loop is if it succeeds when it calls sock() so I dont understand why the error says its an operation on a non-socket. Im just trying to set up a server to pass messages from a client to it a viceversa. Here is the code:
Code:
int main()
{
int socket_fd, new_socket_fd, k;
struct addrinfo hints, *server_info, *p;
struct sockaddr_storage peer_address;
code....
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May 4, 2011
I finally got the certs to configure:
openvpn --config server.conf
Tue May 3 17:26:27 2011 OpenVPN 2.1.1 i686-redhat-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] built on Jan 5 2010
Tue May 3 17:26:27 2011 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Tue May 3 17:26:27 2011 Diffie-Hellman initialized with 1024 bit key
Tue May 3 17:26:27 2011 TLS-Auth MTU parms [ L:1542 D:138 EF:38 EB:0 ET:0 EL:0 ]
Tue May 3 17:26:27 2011 ROUTE default_gateway=192.168.122.1
Tue May 3 17:26:27 2011 TUN/TAP device tun0 opened
Tue May 3 17:26:27 2011 TUN/TAP TX queue length set to 100
Tue May 3 17:26:27 2011 /sbin/ip link set dev tun0 up mtu 1500
Tue May 3 17:26:27 2011 /sbin/ip addr add dev tun0 local 10.8.0.1 peer 10.8.0.2
Tue May 3 17:26:27 2011 /sbin/ip route add 10.8.0.0/24 via 10.8.0.2
Tue May 3 17:26:27 2011 Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ]
Tue May 3 17:26:27 2011 Socket Buffers: R=[114688->131072] S=[114688->131072]
Tue May 3 17:26:27 2011 UDPv4 link local (bound): [undef]:1194
Tue May 3 17:26:27 2011 UDPv4 link remote: [undef]
Tue May 3 17:26:27 2011 MULTI: multi_init called, r=256 v=256
Tue May 3 17:26:27 2011 IFCONFIG POOL: base=10.8.0.4 size=62
Tue May 3 17:26:27 2011 IFCONFIG POOL LIST
Tue May 3 17:26:27 2011 Initialization Sequence Completed
But openvpn still won't start; where to go from here.
Tue May 3 17:54:25 2011 TCP/UDP: Socket bind failed on local address 192.168.122.3:1194: Address already in use
Tue May 3 17:54:25 2011 Exiting
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Apr 30, 2010
I'm setting up an Ubuntu server and I keep getting strange problems with my editor.I'm not sure if this is because my keyboard configuration is wrong or I screwed up the installation but regardless it's quite frustrating.
When using the movement keys (arrows and numpad) I get "[" brackets and "C"s, if I hold down or push down on the key hard a list of errors and text comes up, usually involving something that says something like:"Mount disabled" or "____ disabled press CONTROL-X to restart the shell"Similair problems are also found in vi (when in insert mode).I have been plagued with text editor problems and have need several reboots just to get out of a file, often because it just flat out stopped responding to keyboard commands.
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Aug 24, 2010
I have a laptop and a Desktop both systems only used by myself behind a router. Ubuntu Lucid on both and 64 bit systems. I have installed NFS with the desktop as server and Laptop as client. The NFS only works with the firewalls (UFW) disabled on both machines. My current setup on the desktop ufw is
[Code]...
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Sep 15, 2009
We are seeing recv err on socket 31: 0x36. What could be meaning of the error?.
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Jan 31, 2010
I am pragmatically trying to upload a list of files from my client machine to a proFTPd server I have running on Ubuntu. Every time I get several (around fifty) files into the transfer, I get the following error: Quote: Connection reset by peer: socket write error
I am able to remotely upload 25,000 small files of ~ 1K in size, but when I go to upload hundreds of 2-4 Mb files, I get a socket write error. Am I using up all available sockets before they can be released? If so, how do I release the sockets? If not, what does this error mean and why am I getting it?
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