[PLUG] Debian Sarge SMP slowness?

Eric Harrison eharrison at mail.mesd.k12.or.us
Wed Dec 1 23:58:28 UTC 2004


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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