From: Andrew Morton <akpm@linux-foundation.org>
To: Eric Sandeen <sandeen@redhat.com>
Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, jamie@shareable.org
Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes
Date: Fri, 16 May 2008 13:05:45 -0700 [thread overview]
Message-ID: <20080516130545.845a3be9.akpm@linux-foundation.org> (raw)
In-Reply-To: <482DDA56.6000301@redhat.com>
On Fri, 16 May 2008 14:02:46 -0500
Eric Sandeen <sandeen@redhat.com> wrote:
> A collection of patches to make ext3 & 4 use barriers by
> default, and to call blkdev_issue_flush on fsync if they
> are enabled.
Last time this came up lots of workloads slowed down by 30% so I
dropped the patches in horror.
I just don't think we can quietly go and slow everyone's machines down
by this much. The overhead of journalling is already pretty horrid.
If we were seeing a significant number of "hey, my disk got wrecked"
reports which attributable to this then yes, perhaps we should change
the default. But I've never seen _any_, although I've seen claims that
others have seen reports.
There are no happy solutions here, and I'm inclined to let this dog
remain asleep and continue to leave it up to distributors to decide
what their default should be.
Do we know which distros are enabling barriers by default?
next prev parent reply other threads:[~2008-05-16 20:05 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-16 19:02 [PATCH 0/4] (RESEND) ext3[34] barrier changes Eric Sandeen
2008-05-16 19:05 ` [PATCH 1/4] ext3: enable barriers by default Eric Sandeen
2008-05-19 8:58 ` Pavel Machek
2008-05-16 19:07 ` [PATCH 2/4] ext3: call blkdev_issue_flush on fsync Eric Sandeen
2008-05-16 22:15 ` Jamie Lokier
2008-05-16 19:08 ` [PATCH 3/4] ext4: enable barriers by default Eric Sandeen
2008-05-16 19:09 ` [PATCH 4/4] ext4: call blkdev_issue_flush on fsync Eric Sandeen
2008-05-20 2:34 ` Theodore Tso
2008-05-20 15:43 ` Jamie Lokier
2008-05-20 15:52 ` Eric Sandeen
2008-05-20 19:54 ` Jens Axboe
2008-05-20 22:02 ` Jamie Lokier
2008-05-21 7:30 ` Jens Axboe
[not found] ` <4832F3C6.1050601@redhat.com>
2008-05-20 20:14 ` Jens Axboe
2008-05-16 20:05 ` Andrew Morton [this message]
2008-05-16 20:53 ` [PATCH 0/4] (RESEND) ext3[34] barrier changes Eric Sandeen
2008-05-16 20:58 ` Andrew Morton
2008-05-16 21:45 ` Jamie Lokier
2008-05-16 22:03 ` Eric Sandeen
2008-05-16 22:09 ` Jamie Lokier
2008-05-16 22:03 ` Jamie Lokier
2008-05-16 22:21 ` Eric Sandeen
2008-05-16 22:53 ` Jamie Lokier
2008-05-17 0:20 ` Theodore Tso
2008-05-17 0:35 ` Andrew Morton
2008-05-17 13:43 ` Theodore Tso
2008-05-17 17:59 ` Andreas Dilger
2008-05-17 20:44 ` Theodore Tso
2008-05-20 14:45 ` Jamie Lokier
2008-05-18 0:48 ` Chris Mason
2008-05-18 1:36 ` Theodore Tso
2008-05-18 14:49 ` Ric Wheeler
[not found] ` <4830420D.4080608@gmail.com>
2008-05-20 14:42 ` Jamie Lokier
2008-05-20 23:48 ` Jamie Lokier
2008-05-20 23:44 ` Jamie Lokier
2008-05-18 20:03 ` Andi Kleen
2008-05-19 0:43 ` Theodore Tso
2008-05-19 2:29 ` Eric Sandeen
[not found] ` <4830E60A.2010809@redhat.com>
2008-05-19 4:11 ` Andrew Morton
2008-05-19 17:16 ` Chris Mason
2008-05-19 18:39 ` Chris Mason
2008-05-19 22:39 ` Jan Kara
2008-05-20 0:29 ` Chris Mason
2008-05-20 3:29 ` Timothy Shimmin
2008-05-20 12:04 ` Chris Mason
2008-05-20 8:25 ` Jens Axboe
2008-05-20 12:17 ` Chris Mason
2008-05-21 11:22 ` Pavel Machek
2008-05-21 12:32 ` Theodore Tso
2008-05-21 18:03 ` Andrew Morton
2008-05-21 18:15 ` Eric Sandeen
2008-05-21 19:43 ` Jamie Lokier
2008-05-21 18:29 ` Theodore Tso
2008-05-21 18:49 ` Andrew Morton
2008-05-21 19:42 ` Jamie Lokier
2008-05-21 19:36 ` Jamie Lokier
[not found] ` <20080521193633.GA26780@shareable.org>
2008-05-21 19:40 ` Chris Mason
2008-05-21 19:54 ` Jamie Lokier
2008-05-20 14:58 ` Jamie Lokier
2008-05-21 22:30 ` Daniel Phillips
2008-05-20 23:35 ` Jamie Lokier
2008-05-19 0:28 ` Theodore Tso
2008-05-20 15:13 ` Jamie Lokier
[not found] ` <20080520151306.GF16676@shareable.org>
2008-05-21 20:25 ` Greg Smith
2008-05-16 22:30 ` Jamie Lokier
2008-05-18 19:54 ` Andi Kleen
2008-05-19 13:26 ` Chris Mason
2008-05-19 14:46 ` Theodore Tso
2008-05-20 2:51 ` [PATCH, RFC] ext4: Fix use of write barrier in commit logic Theodore Tso
[not found] ` <20080520025112.GN15035@mit.edu>
2008-05-20 15:23 ` Jamie Lokier
2008-05-23 18:33 ` [PATCH 0/4] (RESEND) ext3[34] barrier changes Ric Wheeler
2008-05-20 15:36 ` Jamie Lokier
2008-05-20 16:02 ` Chris Mason
2008-05-20 16:27 ` Jamie Lokier
2008-05-20 17:08 ` Chris Mason
2008-05-20 22:26 ` Jamie Lokier
2008-05-19 9:04 ` Pavel Machek
2008-05-29 13:36 ` Eric Sandeen
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