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Date: Thu, 22 Dec 2011 21:01:15 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Steve Kargl <sgk@troutmask.apl.washington.edu>
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Cc: freebsd-stable@FreeBSD.org
Subject: Re: SCHED_ULE should not be the default
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on 22/12/2011 20:45 Steve Kargl said the following:
> I've used schedgraph to look at the ktrdump output.  A jpg is
> available at http://troutmask.apl.washington.edu/~kargl/freebsd/ktr.jpg
> This shows the ping-pong effect where here 3 processes appear to be
> using 2 cpus while the remaining 2 processes are pinned to their
> cpus.

I'd recommended enabling CPU-specific background colors via the menu in
schedgraph for a better illustration of your findings.

NB: I still don't understand the point of purposefully running N+1 CPU-bound
processes.

-- 
Andriy Gapon