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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



             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 ` 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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