linux-kernel - volanoMark 12% regression with 2.6.25-rc6

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Date:	Tue, 18 Mar 2008 17:14:10 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: volanoMark 12% regression with 2.6.25-rc6

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@...e.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@...e.hu>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.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


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