From: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
To: Ingo Molnar <mingo@elte.hu>, Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: volanoMark 12% regression with 2.6.25-rc6
Date: Tue, 18 Mar 2008 17:14:10 +0800 [thread overview]
Message-ID: <1205831650.3215.569.camel@ymzhang> (raw)
Comparing with 2.6.25-rc5, volanoMark has 12% regression with 2.6.25-rc6
on my 8-core stoakley.
Bisect tracked it down to:
e22ecef1d2658ba54ed7d3fdb5d60829fb434c23 is first bad commit
commit e22ecef1d2658ba54ed7d3fdb5d60829fb434c23
Author: Ingo Molnar <mingo@elte.hu>
Date: Fri Mar 14 22:16:08 2008 +0100
sched: fix fair sleepers
Fair sleepers need to scale their latency target down by runqueue
weight. Otherwise busy systems will gain ever larger sleep bonus.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
In the patch, vruntime -= calc_delta_fair(sysctl_sched_latency, &cfs_rq->load).
Should we call __sched_period to get the first parameter of calc_delta_fair in case
there are more than 5 tasks in the runqueue?
-yanmin
next reply other threads:[~2008-03-18 9:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-18 9:14 Zhang, Yanmin [this message]
2008-03-18 19:58 ` volanoMark 12% regression with 2.6.25-rc6 Ingo Molnar
2008-03-18 20:22 ` Peter Zijlstra
[not found] ` <1205894373.3215.621.camel@ymzhang>
2008-03-19 14:01 ` Peter Zijlstra
2008-03-19 2:07 ` Zhang, Yanmin
2008-03-19 2:15 ` Ingo Molnar
2008-03-19 3:18 ` Zhang, Yanmin
2008-03-19 3:28 ` Ingo Molnar
[not found] ` <1205901807.3215.659.camel@ymzhang>
2008-03-19 13:48 ` VolanoMark performance improvements (was: Re: volanoMark 12% regression with 2.6.25-rc6) Ingo Molnar
2008-03-20 1:35 ` Zhang, Yanmin
2008-03-21 7:14 ` Zhang, Yanmin
2008-03-21 7:18 ` Zhang, Yanmin
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