CentOS - Aug 2010 - PAE Kernel

I have a box running CentOS 5.x 32 bit.  I noticed these kernels are installed.

[root at ns1 log]# rpm -qa |grep kern |sort
kernel-2.6.18-194.11.1.el5
kernel-2.6.18-194.3.1.el5
kernel-2.6.18-194.8.1.el5
kernel-PAE-devel-2.6.18-194.11.1.el5
kernel-PAE-devel-2.6.18-194.3.1.el5
kernel-PAE-devel-2.6.18-194.8.1.el5

[root at ns1 log]# uname -a
Linux ns1.xx.net 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10 19:09:06 EDT
2010 i686 i686 i386 GNU/Linux

[root at ns1 log]# free
             total       used       free     shared    buffers     cached
Mem:       1025500     687176     338324          0      87824     535628
-/+ buffers/cache:      63724     961776
Swap:      2031608          0    2031608

This machine only has 1G of RAM.  Should I just remove the PAE kernels?

Matt

short answer... you dont really need it in this case. only if you want 
to use more then 3gb ram in a 32bit environment

On 08/27/2010 05:26 PM, Matt wrote:
> I have a box running CentOS 5.x 32 bit.  I noticed these kernels are
installed.
>
> [root at ns1 log]# rpm -qa |grep kern |sort
> kernel-2.6.18-194.11.1.el5
> kernel-2.6.18-194.3.1.el5
> kernel-2.6.18-194.8.1.el5
> kernel-PAE-devel-2.6.18-194.11.1.el5
> kernel-PAE-devel-2.6.18-194.3.1.el5
> kernel-PAE-devel-2.6.18-194.8.1.el5
>
> [root at ns1 log]# uname -a
> Linux ns1.xx.net 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10 19:09:06 EDT
> 2010 i686 i686 i386 GNU/Linux
>
> [root at ns1 log]# free
>               total       used       free     shared    buffers     cached
> Mem:       1025500     687176     338324          0      87824     535628
> -/+ buffers/cache:      63724     961776
> Swap:      2031608          0    2031608
>
> This machine only has 1G of RAM.  Should I just remove the PAE kernels?
>
> Matt
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

Matt,

On 27 August 2010 16:26, Matt <lm7812 at gmail.com>
wrote:
> I have a box running CentOS 5.x 32 bit. ?I noticed these kernels are
installed.
>
> [root at ns1 log]# rpm -qa |grep kern |sort
> kernel-2.6.18-194.11.1.el5
> kernel-2.6.18-194.3.1.el5
> kernel-2.6.18-194.8.1.el5
These are stock kernel.

If you had these, you'd have PAE kernels:
kernel-PAE.i686 : The Linux kernel compiled for PAE capable machines.
kernel-PAE-devel.i686 : Development package for building kernel
modules to match the PAE kernel.
> kernel-PAE-devel-2.6.18-194.11.1.el5
> kernel-PAE-devel-2.6.18-194.3.1.el5
> kernel-PAE-devel-2.6.18-194.8.1.el5
These are just headers and shouldn't do any harm.
Name       : kernel-PAE-devel
Arch       : i686
Version    : 2.6.18
Release    : 194.11.1.el5
Size       : 5.4 M
Repo       : updates
Summary    : Development package for building kernel modules to match
the PAE kernel.
URL        : http://www.kernel.org/
License    : GPLv2
Description: This package provides kernel headers and makefiles
sufficient to build modules
           : against the PAE kernel package.


And this is the PAE kernel info (all from yum info)

Name       : kernel-PAE
Arch       : i686
Version    : 2.6.18
Release    : 194.11.1.el5
Size       : 17 M
Repo       : updates
Summary    : The Linux kernel compiled for PAE capable machines.
URL        : http://www.kernel.org/
License    : GPLv2
Description: This package includes a version of the Linux kernel with
support for up to
           : 16GB of high memory. It requires a CPU with Physical
Address Extensions (PAE).
           : The non-PAE kernel can only address up to 4GB of memory.
           : Install the kernel-PAE package if your machine has more
than 4GB of memory.

-- 
Hakan (m1fcj) - http://www.hititgunesi.org

"Matt" <lm7812 at gmail.com> wrote:
>  I have a box running CentOS 5.x 32 bit.  I noticed these kernels are
>  installed.
>
>  [root at ns1 log]# rpm -qa |grep kern |sort
>  kernel-2.6.18-194.11.1.el5
>  kernel-2.6.18-194.3.1.el5
>  kernel-2.6.18-194.8.1.el5
>  kernel-PAE-devel-2.6.18-194.11.1.el5
>  kernel-PAE-devel-2.6.18-194.3.1.el5
>  kernel-PAE-devel-2.6.18-194.8.1.el5
You can remove kernel-2.6.18-194.3.1.el5 and kernel-2.6.18-194.8.1.el5
and keep only the newest version, kernel-2.6.18-194.11.1.el5.

Since you don't have kernel-PAE, you can also delete all the
kernel-PAE-devel files.

So, you can delete everything except kernel-2.6.18-194.11.1.el5. The
other packages don't do any harm, but they take up disk space
unnecessarily. The kernel-PAE-devel packages also get updated
unnecessarily.


Yves Bellefeuille
<yan at storm.ca>