Re: [suse-sles-e] Shoud I and How to change my kernel from smp to bigsmp?

From: Alexei_Roudnev (Alexei_Roudnev_at_exigengroup.com)
Date: Fri Jul 07 2006 - 22:03:37 CEST

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Message-ID: <147601c6a200$6f6f6970$6f31a8c0@sjc.exigengroup.com>
From: "Alexei_Roudnev" <Alexei_Roudnev@exigengroup.com>
Date: Fri, 7 Jul 2006 13:03:37 -0700
Subject: Re: [suse-sles-e] Shoud I and How to change my kernel from smp to bigsmp?

It is normal (3.5GB on 4GB server); you do not need bigsmp kernel until you
have > 4 GB of RAM.

Kernel allocates some address space for system needs (so underusing few
hundred of megabytes in your case),
but bigsmp kernel is slower and I do not think, that benefits of having
extra 500 MB of ram override extra complexity and slowness.

----- Original Message -----
From: "Michael Daskalov" <MDaskalov@technologica.com>
To: <suse-sles-e@suse.com>
Sent: Friday, July 07, 2006 1:41 AM
Subject: [suse-sles-e] Shoud I and How to change my kernel from smp to
bigsmp?

Hi all,
I am currently running with kernel version 2.6.5-7.252-smp.
When I installed the machine initially it was with 1GB RAM and
hyperthreading enabled.

The machine now has 4GB RAM, but free shows only less than 3.5GB is
available.

srv:~ # free
total used free shared buffers
cached
Mem: 3499720 3373244 126476 0 61352
2078844
-/+ buffers/cache: 1233048 2266672
Swap: 8401976 1586248 6815728

On another machine I installed SLES9 SP3 and the installer choosed the
bigsmp version of the kernel and seems to use all 4GB of RAM.

Should I change from 2.6.5-7.252-smp to 2.6.5-7.252-bigsmp and=20
HOW SHOULD I DO THIS? (what is the best and safest way for this kernel
change?)

A brief description of the differences between smp and bigsmp kernel (or
a link to such) would be much appreciated.
Unfortuantely I could find answers to these questions in the SLES 9
Documentation.

Thanks in advance,
Mihail Daskalov

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