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

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Date:	Tue, 08 Sep 2009 22:15:33 +0000
From:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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

Serge Belyshev <belyshev@...ni.sinp.msu.ru> writes:
>[snip]

I've updated the graphs, added kernels 2.6.24..2.6.29:
http://img186.imageshack.us/img186/7029/epicmakej4.png

And added comparison with best-performing 2.6.23 kernel:
http://img34.imageshack.us/img34/7563/epicbfstips.png

>
> Conclusions are
> 1) mainline has severely regressed since v2.6.23
> 2) BFS shows optimal performance at make -jN where N equals number of
>    h/w threads, while current mainline scheduler performance is far from
>    optimal in this case.
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