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Date: Wed, 14 Dec 2011 19:55:49 +0200
From: Ivan Klymenko <fidaj@ukr.net>
To: Andrey Chernov <ache@FreeBSD.ORG>
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Cc: Adrian Chadd <adrian@FreeBSD.ORG>, Doug Barton <dougb@FreeBSD.ORG>,
	freebsd-stable@FreeBSD.ORG,
	"O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>,
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Subject: Re: SCHED_ULE should not be the default
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=D0=92 Wed, 14 Dec 2011 21:34:35 +0400
Andrey Chernov <ache@FreeBSD.ORG> =D0=BF=D0=B8=D1=88=D0=B5=D1=82:

> 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:
> >=20
> > >> 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.
> >=20
> > Are you able to provide KTR traces of the scheduler results?
> > Something that can be fed to schedgraph?
>=20
> 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.
>=20

Give me, please, detailed instructions on how to do it - I'll do it ...
Be a shame if this the theme is will end again just only the
discussions ...  :(