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From: Roman Kononov <roman@binarylife.net>
To: xfs@oss.sgi.com
Subject: Re: WARNING in xfs_lwr.c, xfs_write()
Date: Mon, 24 May 2010 14:34:28 -0500	[thread overview]
Message-ID: <20100524143428.6f3a117c@abend.internal.xtremedata.com> (raw)
In-Reply-To: <4BF9FCA8.8090906@hardwarefreak.com>

On Sun, 23 May 2010 23:12:24 -0500 Stan Hoeppner
<stan@hardwarefreak.com> wrote:
> "The whole notion of "direct IO" is totally braindamaged. Just say no.
...
> From:  http://lkml.org/lkml/2007/1/10/235

I definitely measure dramatic overall performance benefit using
O_DIRECT carefully.

In that thread, it is doubtful that madvise+mmap+msync allow
asynchronous zero-copy reads and writes to/from already pinned by a
device driver memory of data produced/consumed by that device, without
cache pollution and with intelligent handling of disk errors. Am I
wrong?

Thanks,

Roman

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  parent reply	other threads:[~2010-05-24 19:32 UTC|newest]

Thread overview: 23+ 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 10:18 ` Dave Chinner
2010-05-23 14:23   ` Roman Kononov
2010-05-24  1:19     ` Dave Chinner
2010-06-12  5:00       ` Ilia Mirkin
2010-06-13 22:47         ` Dave Chinner
2010-06-13 23:10           ` Ilia Mirkin
2010-06-14  1:29             ` Dave Chinner
2010-06-14  3:27               ` Ilia Mirkin
2010-06-14 15:11                 ` Roman Kononov
2010-05-24  4:12     ` Stan Hoeppner
2010-05-24  5:16       ` Stewart Smith
2010-05-24 19:34       ` Roman Kononov [this message]
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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