linux-kernel - Re: Epic regression in throughput since v2.6.23

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Message-ID: <87ab15i6q4.fsf@depni.sinp.msu.ru>
Date:	Tue, 08 Sep 2009 19:20:19 +0000
From:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Jesse Brandeburg <jesse.brandeburg@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Con Kolivas <kernel@...ivas.org>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>
Subject: Re: Epic regression in throughput since v2.6.23

Jeff Garzik <jeff@...zik.org> writes:

> You will almost certainly see idle CPUs/threads with "make -jN_CPUS"
> due to processes waiting for I/O.

Just to clarify: I have excluded all I/O effects in my plots completely
by building completely from tmpfs. Also, before each actual measurment
there was a thrown-off "pre-caching" one.  And my box has 8GB of RAM.
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