[CLUE-Tech] Adding A Second Processor

[Chris K. Chew]

A few weeks ago I asked if there were tips when adding a second processor.
I promised that I would report how it went.

The redhat installer choose the uni-processor kernel because only one
processor was found even thought the mobo was dual-capable.  As such, we
recompiled the kernel and included support for SMP.  FYI, upgrading the
kernel is a standard thing we do to every install, and the kernel that comes
with RH 7.2 is already considered very old and buggy.  The new kernel loaded
just fine with SMP and one processor, and even gave a syslog message saying
"Warning, only one processor found...".  When the second one came in the
mail, we shutdown -h, installed the processor, and rebooted.  The kernel was
happy, /proc/cpuinfo was good, and all of our critical applications
(previously compiled with one proc) ran evenly across the two processors.
These include:

Apache
MySQL
SSH (sftp)

So, the only thing that was necessary was recompiling the kernel with SMP
support, and the great kernel hackers took care of the rest.  This was much
easier than adding a second proc to my win2k box!

Thanks for the help,

Chris

-----Original Message-----
From: clue-tech-admin at clue.denver.co.us
[mailto:clue-tech-admin at clue.denver.co.us]On Behalf Of rknech at pcisys.net
Sent: Wednesday, February 20, 2002 11:44 PM
To: clue-tech at clue.denver.co.us
Subject: Re: [CLUE-Tech] Adding A Second Processor


I have two PIII 850MHZ cpu's, when I did a new install of SuSE 7.2 it saw
both
my CPU's and installed the SMP kernal by default. It was sweet. I haven't
had
any problems at all with any of my applications.  Kylix FLIES on it's
compiles!
But, I haven't tested every possible application/utility but so far I have
had
good success.

> Hello.
>
> I am about to add a second processor to my machine.  I have compiled
several
> applications on it since installation (redhat 7.2), but have not yet
> recompiled the kernel.  These applications include:
>
> bind
> openssl
> apache
> php
> mysql
> qmail
> gd
> freetype
> ssh
>
> I imagine that the second proc will not be used until after I recompile
the
> kernel with SMP support, given that RedHat ships with an straight kernel
and
> an SMP kernel and selects the appropriate one during install.  I only have
> the straight kernel installed and am missing the 2.4.10SMP kernel.
>
> Should I expect any problems with the software after I add the second
> processor and recompile the kernel?  Should I expect the second processor
to
> be used before I recompile the kernel?  Will the kernel handle the use of
> both, or do I need to recompile each application before they can make use
of
> the two processors?
>
> Thanks,
>
> Chris
>
> _______________________________________________
> CLUE-Tech mailing list
> CLUE-Tech at clue.denver.co.us
> http://clue.denver.co.us/mailman/listinfo/clue-tech
>


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