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Date: Thu, 4 Sep 2008 13:35:29 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Lin Ming <ming.m.lin@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Subject: Re: oltp ~10% regression with 2.6.27-rc5 on stoakley machine
Message-ID: <20080904113529.GA25533@elte.hu>
References: <1220518266.9590.22.camel@minggr> <1220519034.8609.206.camel@twins> <1220525579.12161.8.camel@minggr> <20080904110901.GD8668@elte.hu> <1220527806.12161.14.camel@minggr>
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* Lin Ming <ming.m.lin@intel.com> wrote:

> A huge trace result file, see the attachment for more.

> # tracer: sched_switch
> #
> #           TASK-PID   CPU#    TIMESTAMP  FUNCTION
> #              | |      |          |         |
>           mysqld-3799  [07]   151.411009:   3799:120:R ==>  3807:120:R
...
>         sysbench-3803  [07]   151.417048:   3803:120:R   +  3791:120:S

ok, this only spans 6 milliseconds, which is probably a bit too light.

Could you please increase the trace size 32-fold (via 
/debug/tracing/trace_entries), and send us the (large!) trace file 
compressed via bzip2 -9, off-list (or via a web link)? [anyone on-list 
can have a look at the smaller trace file already]

Thanks,

	Ingo