LinuxQuestions.org
Did you know LQ has a Linux Hardware Compatibility List?
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Distributions > Fedora
User Name
Password
Fedora This forum is for the discussion of the Fedora Project.

Notices

Reply
 
Search this Thread
Old 01-05-2005, 09:20 PM   #1
jim-j
LQ Newbie
 
Registered: Nov 2003
Location: Norfolk NE
Distribution: Fedora Core 6
Posts: 24

Rep: Reputation: 15
Any reason to keep a non-smp kernel installed on a smp FC3 machine?


I've got Fedora Core 3 installed and working on a dual AMD Opteron machine. I'm running the "2.6.9-1.724_FC3smp" kernel, both CPUs are working, life is good. I've noticed that during the default install the non-smp kernels were also installed. Why were these installed? Do the smp kernels need the non-smp kernels installed? If not, is there any reason to keep a non-smp kernel installed? For example would it ever help troubleshooting to boot into a non-smp kernel or would a non-smp kernel be useful in a recovery scenario?

TIA,
Jim

Last edited by jim-j; 01-05-2005 at 10:15 PM.
 
Old 01-05-2005, 09:41 PM   #2
seabass55
Member
 
Registered: Jan 2003
Location: 127.0.0.1
Distribution: Fedora&Gentoo
Posts: 207

Rep: Reputation: 30
I'm sure there's some moment somewhere where it would become userful but I've ran my poweredge SMP over the years on RH7-FC2 and never needed a none SMP kernel.
 
Old 03-12-2006, 07:06 AM   #3
carl0ski
Member
 
Registered: Sep 2004
Location: Melbourne, Victoria Australia
Distribution: Support those that support you :)
Posts: 872
Blog Entries: 12

Rep: Reputation: 30
Quote:
Originally Posted by jim-j
I've got Fedora Core 3 installed and working on a dual AMD Opteron machine. I'm running the "2.6.9-1.724_FC3smp" kernel, both CPUs are working, life is good. I've noticed that during the default install the non-smp kernels were also installed.
Mandriva 2005 and SuSe 10 does that also,
i assume its purely incase the CPU was incorrectly idetified leaving SMP kernel possibly unbootable. Also in the case of P4 Hyperthreading can be a performance hit non SMP kernel may or maynot disable it..


Quote:
Why were these installed? Do the smp kernels need the non-smp kernels installed? If not, is there any reason to keep a non-smp kernel installed? For example would it ever help troubleshooting to boot into a non-smp kernel or would a non-smp kernel be useful in a recovery scenario?

TIA,
Jim
Recovery no, Fail Safe possibly.

A Dual Processor System Can run a nonSMP kernel but efficient task balancing over the CPUs will be absent and a probable perfomance hit will occur at high load.


I have had issues with SMP kernels causing the RTC to run exactly 2times as fast as it should.
so have to use the nonSMP sometimes when i rely on the CLock.


Documention says a SMP kernel will run on Single CPU system but very poor performance
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FC3 : hyperthreading with smp kernel problem feckit756 Fedora 0 12-08-2004 05:38 AM
kernel 2.6.8.1 and SMP irfanhab Linux - General 3 09-20-2004 05:34 AM
Kernel smp or e for dell machine imsajjadali Red Hat 2 02-12-2004 10:28 PM
SMP kernel not installed during upgrade alexmurray Mandriva 1 11-23-2003 07:19 PM
SUCCESS! Installed dual book Win2k / RH 7.1 on SMP ABIT-VP6 with HPT370 in RAID-0 jthalhammer Linux - Software 0 12-27-2001 11:59 AM


All times are GMT -5. The time now is 08:34 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration