linux-kernel - Re: [PATCH] sched: high-res preemption tick

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Message-Id: <1192343660.7594.19.camel@Homer.simpson.net>
Date:	Sun, 14 Oct 2007 08:34:20 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] sched: high-res preemption tick

On Sun, 2007-10-14 at 01:13 +0200, Peter Zijlstra wrote:
> On Sat, 2007-10-13 at 11:17 +0200, Peter Zijlstra wrote:
> 
> > > Ah, but HRTICK is not compatible with PREEMPT_RESTRICT, it will be
> > > similar to !WAKEUP_PREEMPT.
> > 
> > (I do plan to fix that eventually, just need to do it)
> 
> I guess something like this ought to do, but its a tad late so I'm quite
> sure :-)

2.6.23-smp-d-hrt + restrict fix patch
[SUM]  0.0-300.1 sec    176 GBytes  5.03 Gbits/sec
[SUM]  0.0-300.1 sec    175 GBytes  5.02 Gbits/sec
[SUM]  0.0-300.1 sec    176 GBytes  5.05 Gbits/sec

Context switches are further reduced (across the board) over
PREEMPT_RESTRICT, dropping from ~7-8k to ~2.5k with this test, vs ~950
for SCHED_BATCH and ~50k with this tree and no restriction.  Throughput
is ~96% of SCHED_BATCH, vs ~55% with no restriction.  I see no
interactivity regressions.

	-Mike

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