From: Toralf =?utf-8?q?F=C3=B6rster?= <toralf.foerster@gmx.de>
To: Mike Galbraith <efault@gmx.de>
Subject: Re: (ondemand) CPU governor  regression between 2.6.23 and 2.6.24
Date: Sun, 27 Jan 2008 22:14:47 +0100
User-Agent: KMail/1.9.7
Cc: Sam Ravnborg <sam@ravnborg.org>, Ingo Molnar <mingo@elte.hu>,
       Peter Zijlstra <peterz@infradead.org>, linux-kernel@vger.kernel.org
References: <479B69D2.5050603@wpkg.org> <200801271339.14668.toralf.foerster@gmx.de> <1201460328.5092.95.camel@homer.simson.net>
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At Sunday 27 January 2008 Mike Galbraith wrote :
>=20
> On Sun, 2008-01-27 at 13:39 +0100, Toralf F=C3=B6rster wrote:
> > Ough, does this mean that for a multi-user scenario of 2 non-root users=
 "A" and
> > "B" each running exactly 1 process with nice level 0 and 19 rerspective=
ly
> > that both share ~50% of the CPU *and furthermore* that that user "B" do=
es never
> > ever have a  chance to be nice to user "A" although his process should =
really
> > use only those CPU cycles not eated by any other user ?
>=20
> Yes.  If you want one task group to receive less cpu cycles, you have to
> 'nice' that task group by reducing it's share.

> I think it's better to just disable fair group scheduling if it doesn't
> suit your needs.  It's not going to be everyone's cup of tea.

Yes, disabling this kernel option is much better for me as a notebook user.

BTW t I've one more question related to this topic:

Is it correct that within the scenario described above user "A" never gets =
more
than 50% of the CPU as soon as user "B" is logged into the system (because =
of
the login process itself) ?

> 	-Mike
>=20


=2D-=20
MfG/Sincerely

Toralf F=C3=B6rster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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