linux-kernel - RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour

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Date:	Mon, 17 Mar 2008 09:09:15 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	<linux-ia64@...r.kernel.org>, "Yu, Fenghua" <fenghua.yu@...el.com>
Cc:	"LKML" <linux-kernel@...r.kernel.org>,
	"Hidetoshi Seto" <seto.hidetoshi@...fujitsu.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour

> seto-san teach me method of more investigate.
> and I found the root cause is contained by following patch.
>
>   [IA64] Multiple outstanding ptc.g instruction support

Thank you very much for your testing, and for isolating the
cause of this regression.

> 2.6.25-rc5:     works well
> 2.6.25-rc5-mm1: doesn't finish >12 hour

How long does hackbench take to complete on 2.6.25-rc5?
Does -mm1 hang completely?  Or is it making slow progress?

> Could you please revert that patch from ia64?

I'll revert it while I investigate the cause of this
problem and try to find a way to avoid this problem.

> I dislike its strong regression.

Me too!

-Tony
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