There should be a generic-pae kernel in Ubuntu.
Make it the default if any RAM is detected that is mapped over the 4G
boundary or if the processor have NX support.
BTW, see this for the real story about PAE and NX in Windows XP SP2+:
http://yuhong386.spaces.live.com/blog/cns!57E2793D0C53276F!147.entry

Yuhong Bao


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

[root@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@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@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
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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@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@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@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@centos.org
> http://lists.centos.org/mailman/listinfo/centos
>
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Matt,

On 27 August 2010 16:26, Matt <lm7812@gmail.com> wrote:
> I have a box running CentOS 5.x 32 bit. *I noticed these kernels are installed.
>
> [root@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.

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>> [root@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.

On CentOS 5.x 'yum update' seems to purge all but the latest 3
kernels. Is there anyway to also do that on CentOS 4.x? On my CentOS
4.x server I have had '/boot/' fill up and had to uninstall older
kernels.

Matt
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"Matt" <lm7812@gmail.com> wrote:

> I have a box running CentOS 5.x 32 bit. I noticed these kernels are
> installed.
>
> [root@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@storm.ca>


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