From: "Stephen C. Tweedie" <sct@redhat.com>
To: Jeff Garzik <jgarzik@pobox.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>,
Stephen Tweedie <sct@redhat.com>
Subject: Re: [PATCH] barrier patch set
Date: 31 Mar 2004 15:08:25 +0100 [thread overview]
Message-ID: <1080742105.1991.40.camel@sisko.scot.redhat.com> (raw)
In-Reply-To: <4069F2FC.90003@pobox.com>
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.)
--Stephen
next prev parent reply other threads:[~2004-03-31 14:08 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-19 15:35 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 [this message]
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
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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