linux-kernel - Re: [tbench regression fixes]: digging out smelly deadmen.

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Date:	Mon, 27 Oct 2008 14:42:55 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Mike Galbraith <efault@....de>
cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>, rjw@...k.pl,
	s0mbre@...rvice.net.ru, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

On Mon, 27 Oct 2008, Mike Galbraith wrote:

> > real world workloads. If your fairness hurts throughput that much maybe
> > your scheduler algorithm is just plain *wrong* as it isn't adapting to
> > workload at all well.
> Doesn't seem to be scheduler/fairness.  2.6.22.19 is O(1), and falls
> apart too, I posted the numbers and full dbench output yesterday.

We'll need to look into this a little bit more I think. I have sent out 
some numbers too, and these indicate very clearly that there is more than 
50% performance drop (measured by dbench) just after the very merge of CFS 
in 2.6.23-rc1 merge window.

-- 
Jiri Kosina
SUSE Labs
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