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Date: Wed, 14 Dec 2011 21:34:35 +0400
From: Andrey Chernov <ache@FreeBSD.ORG>
To: Adrian Chadd <adrian@FreeBSD.ORG>
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Cc: Ivan Klymenko <fidaj@ukr.net>, Doug Barton <dougb@FreeBSD.ORG>,
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Subject: Re: SCHED_ULE should not be the default
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On Tue, Dec 13, 2011 at 02:22:48AM -0800, Adrian Chadd wrote:
> On 13 December 2011 01:00, Andrey Chernov <ache@freebsd.org> wrote:
> 
> >> If the algorithm ULE does not contain problems - it means the problem
> >> has Core2Duo, or in a piece of code that uses the ULE scheduler.
> >
> > I observe ULE interactivity slowness even on single core machine (Pentium
> > 4) in very visible places, like 'ps ax' output stucks in the middle by ~1
> > second. When I switch back to SHED_4BSD, all slowness is gone.
> 
> Are you able to provide KTR traces of the scheduler results? Something
> that can be fed to schedgraph?

Sorry, this machine is not mine anymore. I try SCHED_ULE on Core 2 Duo 
instead and don't notice this effect, but it is overall pretty fast 
comparing to that Pentium 4.

-- 
http://ache.vniz.net/