linux-kernel - Re: BFS vs. mainline scheduler benchmarks and measurements

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Message-ID: <20090907210550.GL18599@kernel.dk>
Date:	Mon, 7 Sep 2009 23:05:50 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	Con Kolivas <kernel@...ivas.org>, linux-kernel@...r.kernel.org,
	Mike Galbraith <efault@....de>
Subject: Re: BFS vs. mainline scheduler benchmarks and measurements

On Mon, Sep 07 2009, Peter Zijlstra wrote:
> On Mon, 2009-09-07 at 22:46 +0200, Jens Axboe wrote:
> > > a bug in the SMP load-balancer that can cause interactivity problems 
> > > on large CPU count systems.
> > 
> > Worth trying on the dual core box?
> 
> I debugged the issue on a dual core :-)
> 
> It should be more pronounced on larger machines, but its present on
> dual-core too.

Alright, I'll upgrade that box to -tip tomorrow and see if it makes
a noticable difference. At -j4 or higher, I can literally see windows
slowly popping up when switching to a different virtual desktop.

-- 
Jens Axboe

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