linux-kernel - Re: [RFC/RFT PATCH] sched: automated per tty task groups

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Date:	Tue, 19 Oct 2010 20:53:30 +0200
From:	Mike Galbraith <efault@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC/RFT PATCH] sched: automated per tty task groups

> On Tue, 2010-10-19 at 08:28 -0700, Linus Torvalds wrote:
> >
> >  If people compare with a non-CGROUP_SCHED
> > kernel, will a desktop-optimized kernel suddenly have horrible pipe
> > latency due to much higher scheduling cost? Right now that whole
> > feature is hidden by EXPERIMENTAL, I don't know how much it hurts, and
> > I never timed it when I tried it out long ago..

Q/D test of kernels w/wo, with same .config using pipe-test (pure sched)
gives on my box ~590khz with tty_sched active, 620khz without cgroups
acitve in same kernel/config without patch.  last time I measured
stripped down config (not long ago, but not yesterday either) gave max
ctx rate ~690khz on this box.

(note: very Q, very D numbers, no variance testing, ballpark)

	-Mike

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