linux-kernel - Re: lmbench ctxsw regression with CFS

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Message-ID: <20070802071956.GA23300@elte.hu>
Date:	Thu, 2 Aug 2007 09:19:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: lmbench ctxsw regression with CFS


* Nick Piggin <npiggin@...e.de> wrote:

> > One thing to check out is whether the lmbench numbers are "correct". 
> > Especially on SMP systems, the lmbench numbers are actually *best* 
> > when the two processes run on the same CPU, even though that's not 
> > really at all the best scheduling - it's just that it artificially 
> > improves lmbench numbers because of the close cache affinity for the 
> > pipe data structures.
> 
> Yes, I bound them to a single core.

could you send me the .config you used?

	Ingo
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