linux-kernel - Re: hackbench regression with kernel 2.6.32-rc1

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Message-Id: <1255358032.6818.5.camel@marge.simson.net>
Date:	Mon, 12 Oct 2009 16:33:52 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: hackbench regression with kernel 2.6.32-rc1

On Mon, 2009-10-12 at 16:21 +0200, Peter Zijlstra wrote:

> Mike, did we ever figure out _why_ NEXT_BUDDY introduced latencies?

No, I haven't gotten around to poking at that yet.  I'll try that x264
thing, IIRC, NEXT_BUDDY hurt it pretty badly.

> Buddies shouldn't make latencies worse than regular while(1); loops
> would.

Yeah, no idea what's going wrong.

	-Mike

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