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Subject: RE: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour
Date: Mon, 17 Mar 2008 09:09:15 -0700
Message-ID: <1FE6DD409037234FAB833C420AA843ECD410F3@orsmsx424.amr.corp.intel.com>
In-Reply-To: <20080317204810.7B4F.KOSAKI.MOTOHIRO@jp.fujitsu.com>
Thread-Topic: [2.6.25-rc5-mm1][regression] ia64: hackbench doesn't finish >12 hour
Thread-Index: AciIJbY6BasOwI92S5uRluvB5preDgAIrG4g
References: <20080317200924.7B4C.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20080317204810.7B4F.KOSAKI.MOTOHIRO@jp.fujitsu.com>
From: "Luck, Tony" <tony.luck@intel.com>
To: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>,
       <linux-ia64@vger.kernel.org>, "Yu, Fenghua" <fenghua.yu@intel.com>
Cc: "LKML" <linux-kernel@vger.kernel.org>,
       "Hidetoshi Seto" <seto.hidetoshi@jp.fujitsu.com>,
       "Andrew Morton" <akpm@linux-foundation.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 898
Lines: 29

> 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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