linux-kernel - Re: oltp ~10% regression with 2.6.27-rc5 on stoakley machine

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Message-ID: <20080904113529.GA25533@elte.hu>
Date:	Thu, 4 Sep 2008 13:35:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: oltp ~10% regression with 2.6.27-rc5 on stoakley machine


* Lin Ming <ming.m.lin@...el.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
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