linux-kernel - Re: Performance of ext4

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Message-ID: <Pine.LNX.4.64.0806121940020.2974@diagnostix.dwd.de>
Date:	Thu, 12 Jun 2008 19:50:35 +0000 (GMT)
From:	Holger Kiehl <Holger.Kiehl@....de>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	Theodore Tso <tytso@....edu>, Solofo.Ramangalahy@...l.net,
	Nick Dokos <nicholas.dokos@...com>, linux-ext4@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance of ext4

On Thu, 12 Jun 2008, Aneesh Kumar K.V wrote:

> On Thu, Jun 12, 2008 at 02:07:30PM +0000, Holger Kiehl wrote:
>> This time there is no OOPS and system is still up running without any
>> problem (except any process wanting to write something to this filesystem
>> gets stuck forever).
>>
>> What can I do to help find the problem? The system is still up with all those
>> process hanging in D-state.
>>
>
> if you can login to the system get the dmesg output after
>
> echo t > /proc/sysrq-trigger
>
Unfortunately I have not set CONFIG_MAGIC_SYSRQ. Tomorrow I will try to
reproduce this with a kernel that has CONFIG_MAGIC_SYSRQ set.

Holger

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