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

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Message-ID: <4807377b0909081047kfad088j694bd2b806075c5f@mail.gmail.com>
Date:	Tue, 8 Sep 2009 10:47:25 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...il.com>
To:	Serge Belyshev <belyshev@...ni.sinp.msu.ru>
Cc:	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

On Tue, Sep 8, 2009 at 5:57 AM, Serge
Belyshev<belyshev@...ni.sinp.msu.ru> wrote:
>
> Hi. I've done measurments of time taken by make -j4 kernel build
> on a quadcore box.  Results are interesting: mainline kernel
> has regressed since v2.6.23 release by more than 10%.

Is this related to why I now have to double the amount of threads X I
pass to make -jX, in order to use all my idle time for a kernel
compile?  I had noticed (without measuring exactly) that it seems with
each kernel released in this series mentioned, I had to increase my
number of worker threads, my common working model now is (cpus * 2) in
order to get zero idle time.

Sorry I haven't tested BFS yet, but am interested to see if it helps
interactivity when playing flash videos on my dual core laptop.
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