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

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Message-ID: <20090908091304.GQ18599@kernel.dk>
Date:	Tue, 8 Sep 2009 11:13:04 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
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: BFS vs. mainline scheduler benchmarks and measurements

On Mon, Sep 07 2009, Jens Axboe wrote:
> On Mon, Sep 07 2009, Jens Axboe wrote:
> > > And yes, it would be wonderful to get a test-app from you that would 
> > > express the kind of pain you are seeing during compile jobs.
> > 
> > I was hoping this one would, but it's not showing anything. I even added
> > support for doing the ping and wakeup over a socket, to see if the pipe
> > test was doing well because of the sync wakeup we do there. The net
> > latency is a little worse, but still good. So no luck in making that app
> > so far.
> 
> Here's a version that bounces timestamps between a producer and a number
> of consumers (clients). Not really tested much, but perhaps someone can
> compare this on a box that boots BFS and see what happens.

And here's a newer version. It ensures that clients are running before
sending a timestamp, and it drops the first and last log entry to
eliminate any weird effects there. Accuracy should also be improved.

On an idle box, it'll usually log all zeroes. Sometimes I see 3-4msec
latencies, weird.

-- 
Jens Axboe


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