linux-kernel - Re: [PATCH v2] x86: Reduce clock calibration time during slave cpu startup

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Message-ID: <20110806065820.GF13220@elte.hu>
Date:	Sat, 6 Aug 2011 08:58:20 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	tglx@...utronix.de, davej@...hat.com, yinghan@...gle.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] x86: Reduce clock calibration time during slave cpu
 startup


* Yinghai Lu <yhlu.kernel@...il.com> wrote:

> On Fri, Aug 5, 2011 at 6:16 AM, Jack Steiner <steiner@....com> wrote:
> > Aside from the bogus comment (I'll send a V3 with a fixed comment), does the patch
> > look ok.
> 
> Several months ago, Robin said that he will test updated version
> 
> [PATCH] x86: Make calibrate_delay run in parallel.
> 
> so any reason that you sgi guyes stop that path?

Running calibration in parallel is pretty stupid: cores/threads might 
impact each other and there might be a lot of avoidable noise in the 
results.

Thanks,

	Ingo
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