linux-kernel - Re: Major regression on hackbench with SLUB

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Message-ID: <alpine.LFD.0.9999.0712070957070.7274@woody.linux-foundation.org>
Date:	Fri, 7 Dec 2007 09:59:33 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: Major regression on hackbench with SLUB



On Fri, 7 Dec 2007, Steven Rostedt wrote:
> 
> The regression is that hackbench slows down tremendously. It goes from
> running just under 2 seconds to running around 14 seconds.

Can you do one run with oprofile, and see exactly where the cost is? It 
should hopefully be pretty darn obvious, considering your timing.

			Linus
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