From: Jeff Garzik <jgarzik@pobox.com>
To: "Stephen C. Tweedie" <sct@redhat.com>
Cc: Chris Mason <mason@suse.com>,
Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>,
Jens Axboe <axboe@suse.de>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] barrier patch set
Date: Wed, 31 Mar 2004 16:27:32 -0500 [thread overview]
Message-ID: <406B37C4.7050402@pobox.com> (raw)
In-Reply-To: <1080742105.1991.40.camel@sisko.scot.redhat.com>
Stephen C. Tweedie wrote:
> Hi,
>
> On Tue, 2004-03-30 at 23:21, Jeff Garzik wrote:
>
>
>>For IDE, O_DIRECT and O_SYNC can use special "FUA" commands, which don't
>>return until the data is on the platter.
>
>
> fsync() is still really nasty, because that can require that we wait on
> IO that was submitted by the VM before we knew that there was a
> synchronous IO wait coming. SCSI also has an FUA bit that can make a
> difference if you've got writeback caching enabled. (And FUA on read
> can bypass drive writethrough caches, too, for media verification.)
Agreed, but I did not mention fsync(), since that would not be
appropriate to FUA like O_DIRECT or O_SYNC might be.
Jeff
next prev parent reply other threads:[~2004-03-31 21:33 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-19 15:35 [PATCH] barrier patch set Jens Axboe
2004-03-19 16:30 ` Mika Penttilä
2004-03-19 18:16 ` Jens Axboe
2004-03-19 18:44 ` Mika Penttilä
2004-03-20 9:55 ` Jens Axboe
2004-03-19 16:34 ` Jeff Garzik
2004-03-19 18:19 ` Jens Axboe
2004-03-19 23:01 ` Matthias Andree
2004-03-20 0:02 ` Bartlomiej Zolnierkiewicz
2004-03-20 1:48 ` Johannes Stezenbach
2004-03-20 2:13 ` Bartlomiej Zolnierkiewicz
2004-03-20 2:53 ` Johannes Stezenbach
2004-03-20 16:03 ` Bartlomiej Zolnierkiewicz
2004-03-20 11:36 ` Matthias Andree
2004-03-20 16:00 ` Bartlomiej Zolnierkiewicz
2004-03-20 23:36 ` Johannes Stezenbach
2004-03-21 1:33 ` Bartlomiej Zolnierkiewicz
2004-03-20 18:52 ` Helge Hafting
2004-03-22 11:15 ` Matthias Andree
2004-03-19 23:59 ` Bartlomiej Zolnierkiewicz
2004-03-20 0:14 ` Jeff Garzik
2004-03-20 0:40 ` Bartlomiej Zolnierkiewicz
2004-03-20 0:42 ` Jeff Garzik
2004-03-20 1:24 ` Bartlomiej Zolnierkiewicz
2004-03-20 9:58 ` Jens Axboe
2004-03-20 10:12 ` Jeff Garzik
2004-03-20 10:19 ` Jens Axboe
2004-03-20 10:37 ` Jeff Garzik
2004-03-20 16:30 ` Bartlomiej Zolnierkiewicz
2004-03-21 18:12 ` Jeff Garzik
2004-03-20 10:21 ` Jeff Garzik
2004-03-20 15:54 ` Bartlomiej Zolnierkiewicz
2004-03-20 0:17 ` Jeff Garzik
2004-03-20 9:53 ` Jens Axboe
2004-03-20 16:23 ` Bartlomiej Zolnierkiewicz
2004-03-20 16:27 ` Jens Axboe
2004-03-20 16:32 ` Chris Mason
2004-03-20 17:05 ` Bartlomiej Zolnierkiewicz
2004-03-20 17:10 ` Chris Mason
2004-03-20 20:16 ` Bartlomiej Zolnierkiewicz
2004-03-21 9:43 ` Jens Axboe
2004-03-30 16:04 ` Stephen C. Tweedie
2004-03-30 19:19 ` Chris Mason
2004-03-30 21:50 ` Stephen C. Tweedie
2004-03-30 22:13 ` Chris Mason
2004-03-31 14:03 ` Stephen C. Tweedie
2004-03-31 14:27 ` Chris Mason
2004-03-31 18:28 ` Ric Wheeler
2004-03-30 22:21 ` Jeff Garzik
2004-03-30 22:36 ` Chris Wedgwood
2004-03-30 22:39 ` Jeff Garzik
2004-03-30 22:41 ` Chris Wedgwood
2004-03-30 22:40 ` Bartlomiej Zolnierkiewicz
2004-03-30 22:38 ` Jeff Garzik
2004-03-31 14:08 ` Stephen C. Tweedie
2004-03-31 14:21 ` Chris Mason
2004-03-31 21:26 ` Jeff Garzik
2004-03-31 22:09 ` Chris Mason
2004-03-31 21:27 ` Jeff Garzik [this message]
2004-03-19 16:48 ` Marc-Christian Petersen
2004-03-19 18:19 ` Jens Axboe
2004-03-22 11:09 ` Andrew Morton
2004-03-22 11:10 ` Jens Axboe
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