[rhn-users] RedHat ES 3.0 - kernel problem

[Ted Marshall]

As others have chimed in, it's the SMP kernel for two+ processors.

As for your application crash problem, you may have an application bug in
terms of synchronizing access to shared memory.  There are locking protocols
that work fine on a uniprocessor system but fail on an SMP system.  In fact,
you might have a sync bug that also manifests on a 1-processor system but
just crashes much more often with two (virtual) processors.  Proper shared
memory programming can be non-trivial and with two processors, you're more
likely to have two processes hitting the same structure at the same time.

> Date: Wed, 24 Mar 2004 10:14:53 +0100
> From: espen.ekeroth at om.com
> Subject: [rhn-users] RedHat ES 3.0 - kernel problem
> To: rhn-users at redhat.com
> Message-ID: <C1256E61.0032C021.00 at omext02.omgroup.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
>
> The RedHat ES 3.0 is shipped with 2 different kernels:
>
> 2.4.21-9.EL
> 2.4.21-9.EL.smtp
>
> Our server is a Compaq DL360 with 1 CPU.
>
> Default the installation uses the smtp version of the kernel. For me it
> looks like the kernel is faking 2 CPU's - at least "top" shows 2 CPU's.
>
> What is the difference between the smtp kernel and the "normal" kernel?
>
> The reason for asking, is that our application that uses intra host
> messaging with tcp, shared memory and signaling dies randomly with the
> smtp version, and never with the normal kernel.
>
> Espen
>
> =============
> Espen Ekeroth
> + 47 69 21 55 81
>  =============
>
>
>
>
>
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