From: Christoph Hellwig <hch@infradead.org>
To: device-mapper development <dm-devel@redhat.com>
Cc: Mike Snitzer <msnitzer@redhat.com>,
"Alasdair G. Kergon" <agk@redhat.com>
Subject: Re: dm-crypt performance
Date: Tue, 26 Mar 2013 02:52:29 -0400 [thread overview]
Message-ID: <20130326065229.GA2884@infradead.org> (raw)
In-Reply-To: <Pine.LNX.4.64.1303252051520.9745@file.rdu.redhat.com>
On Mon, Mar 25, 2013 at 11:47:22PM -0400, Mikulas Patocka wrote:
> If I sort the requests in dm-crypt to come out in the same order as they
> were received, there is no longer any slowdown, the new crypt performs as
> well as the old crypt, but the last time I submitted the patches, people
> objected to sorting requests in dm-crypt, saying that the I/O scheduler
> should sort them. But it doesn't. This problem still persists in the
> current kernels.
FYI, XFS also does it's own request ordering for the metadata buffers,
because it knows the needed ordering and has a bigger view than than
than especially CFQ. You at least have precedence in a widely used
subsystem for this code.
next prev parent reply other threads:[~2013-03-26 6:52 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-26 3:47 dm-crypt performance Mikulas Patocka
2013-03-26 6:52 ` Christoph Hellwig [this message]
2013-03-26 12:27 ` [dm-devel] " Alasdair G Kergon
2013-03-26 20:05 ` Milan Broz
2013-03-26 20:28 ` Mike Snitzer
2013-03-26 20:58 ` Milan Broz
2013-03-28 18:53 ` Tejun Heo
2013-03-28 19:33 ` Vivek Goyal
2013-03-28 19:44 ` Tejun Heo
2013-03-28 20:38 ` Vivek Goyal
2013-03-28 20:45 ` Tejun Heo
2013-04-09 17:51 ` dm-crypt parallelization patches Mikulas Patocka
2013-04-09 17:57 ` Tejun Heo
2013-04-09 18:08 ` Mikulas Patocka
2013-04-09 18:10 ` Tejun Heo
2013-04-09 18:42 ` Vivek Goyal
2013-04-09 18:57 ` Tejun Heo
2013-04-09 19:13 ` Vivek Goyal
2013-04-09 19:42 ` Mikulas Patocka
2013-04-09 19:52 ` Tejun Heo
2013-04-09 20:32 ` Mikulas Patocka
2013-04-09 21:02 ` Tejun Heo
2013-04-09 21:03 ` Tejun Heo
2013-04-09 21:07 ` Vivek Goyal
2013-04-09 21:18 ` Mikulas Patocka
2013-04-10 19:24 ` Vivek Goyal
2013-04-10 23:42 ` [PATCH] make dm and dm-crypt forward cgroup context (was: dm-crypt parallelization patches) Mikulas Patocka
2013-04-10 23:50 ` Tejun Heo
2013-04-11 19:49 ` [PATCH v2] " Mikulas Patocka
2013-04-11 19:52 ` Tejun Heo
2013-04-11 20:00 ` Tejun Heo
2013-04-12 0:06 ` Mikulas Patocka
2013-04-12 0:22 ` Tejun Heo
2013-04-12 5:59 ` [PATCH v2] make dm and dm-crypt forward cgroup context Milan Broz
2013-04-12 18:17 ` [PATCH v2] make dm and dm-crypt forward cgroup context (was: dm-crypt parallelization patches) Mikulas Patocka
2013-04-12 18:01 ` Mikulas Patocka
2013-04-12 18:29 ` Tejun Heo
2013-04-15 13:02 ` Mikulas Patocka
2013-04-16 17:24 ` Tejun Heo
2013-04-16 19:41 ` Mikulas Patocka
2013-04-18 16:47 ` Mike Snitzer
2013-04-18 17:03 ` Tejun Heo
2013-05-22 18:50 ` Mike Snitzer
2013-05-22 19:48 ` Tejun Heo
2013-04-09 18:36 ` dm-crypt parallelization patches Vivek Goyal
[not found] ` <5151FF82.6090405-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-04-09 18:08 ` [dm-devel] dm-crypt performance Mikulas Patocka
2013-04-09 18:59 ` [dm-crypt] " Milan Broz
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