LinuxQuestions.org
Help answer threads with 0 replies.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Newbie
User Name
Password
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!

Notices

Reply
 
Search this Thread
Old 03-12-2008, 12:17 PM   #1
Farmer Baker
LQ Newbie
 
Registered: Mar 2008
Posts: 2

Rep: Reputation: 0
Talking Change kernel loaded from 2.6.9-55.ELlargesmp to 2.6.9-55.ELsmp


We are trying to load RHEL AS 4 Update 5 on a 4 CPU quad core HP DL580 G5 (7350 2.93Ghz).

It is loading the 2.6.9-55.ELlargesmp kernel which is not compatible with some multipathing drivers we want to load. These are compatible with the 2.6.9-55.ELsmp kernel which is not being compiled on installation.

How do we control the kernels that are compiled and loaded on installation?
 
Old 03-12-2008, 02:47 PM   #2
Lenard
Senior Member
 
Registered: Dec 2005
Location: Indiana
Distribution: RHEL/CentOS/SL 5 i386 and x86_64 pata for IDE in use
Posts: 4,790

Rep: Reputation: 56
Check and see if you have the kernel you want first;

rpm -qa 'kernel*'

If yes then simply as root using your choice of editor to make this the default kernel by editing the /boot/grub/grub.conf file, remember the counting starts at zero.

If not then install the kernel you want;

Using the installation media as the source: rpm -ivh kernel-2.6.9-55.ELsmp*.rpm --force
Using RHN: up2date --nox -f kernel-2.6.9-55.ELsmp

Then modify the /boot/grub.grub.conf file.
 
Old 03-13-2008, 09:42 AM   #3
Farmer Baker
LQ Newbie
 
Registered: Mar 2008
Posts: 2

Original Poster
Rep: Reputation: 0
Smile RHEL 4 2.6.9-55.ELsmp kernel max CPUs/cores

Lenard

Thanks for that. We have loaded and successfully forced the load of the ELsmp kernel, but this only shows 8 of the 16 cores present. One of my colleagues has since found a restriction that RHEL 4 U5 can only support 8 cores or CPUs with the ELsmp kernel.

(Taken from http://kbase.redhat.com/faq/FAQ_85_7936.shtm):
The largesmp kernel is required for any AMD64 or Intel EM64T host with more than 8 CPU cores (regardless of how many sockets).
On supported architectures, systems with greater than 8 cpus will get automatically installed with largesmp kernels.

Hence we have to use the 2.6.9-55.ELlargesmp kernel to get all 16 cores in RHEL 4 U5 or use RHEL 5 which has better support for quad core with the standard ELsmp kernel.

Thanks - problem closed
 
  


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
7.1 ch. Audigy SE driver for RedHat 5 (kernel 2.6.9-55.ELsmp) on Athlon64? maya_stavrianakou Linux - Newbie 1 02-28-2008 05:42 PM
Where will I get RHEL3 with kernel 2.4.21-27.Elsmp hsmukunda Linux - Newbie 2 11-17-2006 10:40 AM
keyboard and mouse stopped working completely in kernel 2.6.9-5.ELsmp Antony_wind Linux - Software 3 08-26-2005 01:56 PM
RedHat ELsmp passwd change hanging co_bofh Linux - General 1 03-13-2005 12:53 AM
java crashes on 2.4.21-20.ELsmp kernel rvmoye Red Hat 1 12-16-2004 02:01 PM


All times are GMT -5. The time now is 06:56 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