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From: Stan Hoeppner <stan@hardwarefreak.com>
To: xfs@oss.sgi.com
Subject: Re: WARNING in xfs_lwr.c, xfs_write()
Date: Sun, 23 May 2010 23:12:24 -0500	[thread overview]
Message-ID: <4BF9FCA8.8090906@hardwarefreak.com> (raw)
In-Reply-To: <20100523092344.0fcaab42@aaa.pulp.binarylife.net>

Roman Kononov put forth on 5/23/2010 9:23 AM:
> On 2010-05-23, 20:18:56 +1000, Dave Chinner <david@fromorbit.com> wrote:
>> You've got some workload that is mixing direct IO writes with some
>> form of buffered or mmap IO on the same file and they are racing.
>> Mixing different types of IO on the one inode is also known as A
>> Really Bad Idea because there is no guarantee of coherency between
>> them....
>>
>> Can you find out what the application is triggering this?
> 
> This is severely modified Postgresql, which does mix direct IO with
> buffered one.

"The whole notion of "direct IO" is totally braindamaged. Just say no.

	This is your brain: O
	This is your brain on O_DIRECT: .

	Any questions?"


		Linus

From:  http://lkml.org/lkml/2007/1/10/235


-- 
Stan

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  parent reply	other threads:[~2010-05-24  4:09 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-23  5:20 WARNING in xfs_lwr.c, xfs_write() Roman Kononov
2010-05-23  5:20 ` Roman Kononov
2010-05-23 10:18 ` Dave Chinner
2010-05-23 10:18   ` Dave Chinner
2010-05-23 14:23   ` Roman Kononov
2010-05-23 14:23     ` Roman Kononov
2010-05-24  1:19     ` Dave Chinner
2010-05-24  1:19       ` Dave Chinner
2010-06-12  5:00       ` Ilia Mirkin
2010-06-12  5:00         ` Ilia Mirkin
2010-06-13 22:47         ` Dave Chinner
2010-06-13 22:47           ` Dave Chinner
2010-06-13 23:10           ` Ilia Mirkin
2010-06-13 23:10             ` Ilia Mirkin
2010-06-14  1:29             ` Dave Chinner
2010-06-14  1:29               ` Dave Chinner
2010-06-14  3:27               ` Ilia Mirkin
2010-06-14  3:27                 ` Ilia Mirkin
2010-06-14 15:11                 ` Roman Kononov
2010-06-14 15:11                   ` Roman Kononov
2010-05-24  4:12     ` Stan Hoeppner [this message]
2010-05-24  5:16       ` Stewart Smith
2010-05-24 19:34       ` Roman Kononov
2010-05-26  7:06         ` Dave Chinner
2010-05-26 15:07           ` NOW: o_direct -- WAS: " Stan Hoeppner
2010-05-27 11:05             ` Michael Monnerie
2010-05-27 11:47             ` Christoph Hellwig
2010-05-27 13:58               ` Stewart Smith
2010-05-27 14:57                 ` Christoph Hellwig
2010-05-27 15:45                   ` Stewart Smith
2010-05-28  0:25               ` Stan Hoeppner
2010-05-27 14:05             ` Stewart Smith
2010-05-28  0:42               ` Stan Hoeppner

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