linux-kernel - sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1

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Message-Id: <1210136148.3453.59.camel@ymzhang>
Date:	Wed, 07 May 2008 12:55:48 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1

Comparing with kernel 2.6.25, sysbench+mysql(oltp, readonly) has many
regression with 2.6.26-rc1.

1) 8-core stoakley: 28%;
2) 16-core tigerton: 20%;
3) Itanium Montvale: 50%.

Bisect located below patch.

8f1bc385cfbab474db6c27b5af1e439614f3025c is first bad commit
commit 8f1bc385cfbab474db6c27b5af1e439614f3025c
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date:   Sat Apr 19 19:45:00 2008 +0200

    sched: fair: weight calculations
    
    In order to level the hierarchy, we need to calculate load based on the
    root view. That is, each task's load is in the same unit.



After I manually reverted the patch against 2.6.26-rc1 while fixing a couple of
conflictions/errors, sysbench oltp regression became less than 3% on 8-core
stoakley.

-yanmin


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