linux-kernel - Re: AIM7 40% regression with 2.6.26-rc1

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Message-ID: <20080507172542.GA13389@elte.hu>
Date:	Wed, 7 May 2008 19:25:42 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Matthew Wilcox <matthew@....cx>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@....linux.org.uk>,
	linux-fsdevel@...r.kernel.org
Subject: Re: AIM7 40% regression with 2.6.26-rc1


* Ingo Molnar <mingo@...e.hu> wrote:

> There's far more normal mutex fastpath use during an AIM7 run than any 
> BKL use. So if it's due to any direct fastpath overhead and the 
> resulting widening of the window for the real slowdown, we should see 
> a severe slowdown on AIM7 with CONFIG_MUTEX_DEBUG=y. Agreed?

my own guesstimate about AIM7 performance impact resulting out of 
CONFIG_MUTEX_DEBUG=y: performance overhead will not be measurable, or 
will at most be in the sub-1% range. But i've been badly wrong before :)

	Ingo
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