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Date: Sat, 5 Nov 2011 20:59:46 +0200
From: Ivan Klymenko <fidaj@ukr.net>
To: "O. Hartmann" <ohartman@zedat.fu-berlin.de>
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Cc: freebsd-current@freebsd.org, Jeff Roberson <jroberson@jroberson.net>,
	Andriy Gapon <avg@FreeBSD.org>
Subject: Re: Increase the degree of interactivity ULE scheduler
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=D0=92 Sat, 05 Nov 2011 19:42:12 +0100
"O. Hartmann" <ohartman@zedat.fu-berlin.de> =D0=BF=D0=B8=D1=88=D0=B5=D1=82:

> Am 11/04/11 14:33, schrieb Ivan Klymenko:
> > Maybe useful the following information:
> > This problem appears not to all architectures and types of CPU.
> > on the Russian forums
> > http://www.bsdportal.ru/viewtopic.php?t=3D24900
> > http://forum.lissyara.su/viewtopic.php?f=3D45&t=3D34641&sid=3Daa596f0b7=
0806ba053011da911f9ccae
> > was a brute force to find out that:
> > there is a suspicion that:
> > - for AMD processors, this problem is not observed at all when the
> > number of cores >=3D 2
> > - on all single-core is the problem
> > - only for some models with Intel >=3D 2 cores of the problem is not
> > found
> >=20
> > Perhaps, after all, avg@ rights (Subject: couple of sched_ule
> > issues), that is not working properly mechanism rebalancing and to
> > determine the topology of CPU? All converge, because my patch
> > ( http://docs.freebsd.org/cgi/mid.cgi?20111022132817.35db5ccd ) for
> > SMP systems just do respite for rebalancing, which eliminates the
> > problem with interactivity ...
> >=20
> > Thanks!
>=20
> Is the patch going to be merged into HEAD shortly?
>=20
> Regards,
> Oliver
>=20

I'm not sure... Most of all we must address the root causes of this
problem...