From: "Colin Fowler" <elethiomel@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org, "Peter Zijlstra" <a.p.zijlstra@chello.nl>
Subject: Re: Performance loss 2.6.22->22.6.23->2.6.24-rc7 on CPU intensive benchmark on 8 Core Xeon
Date: Wed, 16 Jan 2008 17:34:22 +0000 [thread overview]
Message-ID: <cf3edd8d0801160934u2e39110dv2ccc98081e983b25@mail.gmail.com> (raw)
In-Reply-To: <20080115220641.GC2665@elte.hu>
> there are a handful of 'scheduler feature bits' in
> /proc/sys/kernel/sched_features:
>
> enum {
> SCHED_FEAT_NEW_FAIR_SLEEPERS = 1,
> SCHED_FEAT_WAKEUP_PREEMPT = 2,
> SCHED_FEAT_START_DEBIT = 4,
> SCHED_FEAT_TREE_AVG = 8,
> SCHED_FEAT_APPROX_AVG = 16,
> };
>
Toggling SCHED_FEAT_NEW_FAIR_SLEEPERS to 0 or
SCHED_FEAT_WAKEUP_PREEMPT to 0 gives me results more inline with my
2.6.22 results. Toggling them both to 0 gives me slightly better
results than 2.6.22!
> /sys/devices/system/cpu/sched_mc_power_savings
>
> does that change the results?
>
no measurable difference on this toggle that I can see.
next prev parent reply other threads:[~2008-01-16 17:34 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-14 17:37 Colin Fowler
2008-01-14 18:55 ` Ingo Molnar
2008-01-14 22:42 ` Colin Fowler
2008-01-14 22:43 ` Colin Fowler
2008-01-15 17:01 ` Colin Fowler
2008-01-15 22:06 ` Ingo Molnar
2008-01-15 23:05 ` Colin Fowler
2008-01-16 15:35 ` Ingo Molnar
2008-01-16 16:10 ` Colin Fowler
2008-01-16 16:19 ` Ingo Molnar
2008-01-16 16:38 ` Colin Fowler
2008-01-16 17:34 ` Colin Fowler [this message]
2008-01-18 10:55 ` Ingo Molnar
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