[PLUG] Debian Sarge SMP slowness?

[Sean Whitney]

My first indication would be to compare the .config files for each
kernel to see what's different, also to check out and see if there are
any patches applied to either kernel.


Sean

On Wed, 2004-12-01 at 15:58 -0800, Eric Harrison wrote:

> One of the school districts I often work with (who happen to be near
> Redmond Washington ;-) is having SMP performance problems with the
> Sarge 2.6.8-i686-smp kernel.
> 
> They are working on a backup server. The symptom is that if they fire
> up 6 concurrent backup processes, every minute or so one of the
> processes
> goes to 100% wa state, the others go to 100% idle, the backup processes
> go to a D state, and nothing happens for 10 - 60 seconds. Then
> everything
> works again for another minute.
> 
> Running the same tests on a Red Hat box, every process runs, raising
> the load average to 6 as would be expected. The throughput is twice
> as high as the Debian box.
> 
> Have any of you Debian gurus here seen this, and more importantly
> know a fix? ;-)
> 
> -Eric
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