From: Ingo Molnar <mingo@elte.hu>
To: Rob Hussey <robjhussey@gmail.com>
Cc: linux-kernel@vger.kernel.org, ck@vds.kolivas.org
Subject: Re: Scheduler benchmarks - a follow-up
Date: Mon, 17 Sep 2007 22:36:07 +0200 [thread overview]
Message-ID: <20070917203607.GA20564@elte.hu> (raw)
In-Reply-To: <20070917130524.GA10707@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> i've meanwhile tested hackbench 90 and the performance difference
> between -ck and -cfs-devel seems to be mostly down to the more precise
> (but slower) sched_clock() introduced in v2.6.23 and to the startup
> penalty of freshly created tasks.
Rob, another thing i just noticed in your .configs: you have
CONFIG_PREEMPT=y enabled. Would it be possible to get a testrun with
that disabled? That gives the best throughput and context-switch latency
numbers. (CONFIG_PREEMPT might also have preemption artifacts - there's
one report of it having _worse_ desktop latencies on certain hardware
than !CONFIG_PREEMPT.)
Ingo
next prev parent reply other threads:[~2007-09-17 20:36 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-17 9:21 Scheduler benchmarks - a follow-up Rob Hussey
2007-09-17 11:12 ` Ed Tomlinson
2007-09-17 11:47 ` Ingo Molnar
2007-09-17 20:22 ` Ingo Molnar
2007-09-17 11:27 ` Ingo Molnar
[not found] ` <E1IXMXf-0000uG-ID@flower>
2007-09-17 19:43 ` Willy Tarreau
2007-09-17 20:01 ` Ingo Molnar
2007-09-17 20:06 ` Oleg Verych
2007-09-17 20:05 ` Ingo Molnar
2007-09-17 20:42 ` Willy Tarreau
2007-09-17 13:05 ` Ingo Molnar
2007-09-17 14:01 ` [ck] " Jos Poortvliet
2007-09-17 14:12 ` Ingo Molnar
2007-09-17 20:36 ` Ingo Molnar [this message]
2007-09-18 4:30 ` Rob Hussey
2007-09-18 4:53 ` Willy Tarreau
2007-09-18 4:58 ` Rob Hussey
2007-09-18 6:40 ` Ingo Molnar
2007-09-18 8:23 ` Rob Hussey
2007-09-18 8:48 ` Ingo Molnar
2007-09-18 9:45 ` Rob Hussey
2007-09-18 9:48 ` Ingo Molnar
2007-09-18 1:44 ` Rob Hussey
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