From: Alasdair G Kergon <agk@redhat.com>
To: Martin Knoblauch <spamtrap@knobisoft.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>, Fengguang Wu <wfg@mail.ustc.edu.cn>,
Mike Snitzer <snitzer@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
jplatte@naasa.net, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
James.Bottomley@steeleye.com, Jens Axboe <jens.axboe@oracle.com>,
Milan Broz <mbroz@redhat.com>, Neil Brown <neilb@suse.de>
Subject: Re: regression: 100% io-wait with 2.6.24-rcX
Date: Tue, 22 Jan 2008 14:39:33 +0000 [thread overview]
Message-ID: <20080122143933.GA11111@agk.fab.redhat.com> (raw)
In-Reply-To: <903015.63912.qm@web32611.mail.mud.yahoo.com>
On Fri, Jan 18, 2008 at 11:01:11AM -0800, Martin Knoblauch wrote:
> At least, rc1-rc5 have shown that the CCISS system can do well. Now
> the question is which part of the system does not cope well with the
> larger IO sizes? Is it the CCISS controller, LVM or both. I am open to
> suggestions on how to debug that.
What is your LVM device configuration?
E.g. 'dmsetup table' and 'dmsetup info -c' output.
Some configurations lead to large IOs getting split up on the way through
device-mapper.
See if these patches make any difference:
http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/editing/
dm-md-merge_bvec_fn-with-separate-bdev-and-sector.patch
dm-introduce-merge_bvec_fn.patch
dm-linear-add-merge.patch
dm-table-remove-merge_bvec-sector-restriction.patch
Alasdair
--
agk@redhat.com
next prev parent reply other threads:[~2008-01-22 14:41 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-18 8:19 regression: 100% io-wait with 2.6.24-rcX Martin Knoblauch
2008-01-18 16:01 ` Mel Gorman
2008-01-18 17:46 ` Linus Torvalds
2008-01-18 19:01 ` Martin Knoblauch
2008-01-18 19:23 ` Linus Torvalds
2008-01-22 14:39 ` Alasdair G Kergon [this message]
2008-01-18 20:00 ` Mike Snitzer
2008-01-18 22:47 ` Mike Snitzer
-- strict thread matches above, loose matches on Subject: below --
2008-01-23 11:12 Martin Knoblauch
2008-01-22 18:51 Martin Knoblauch
2008-01-22 15:25 Martin Knoblauch
2008-01-22 23:40 ` Alasdair G Kergon
2008-01-19 10:24 Martin Knoblauch
2008-01-17 21:50 Martin Knoblauch
2008-01-17 22:12 ` Mel Gorman
2008-01-17 17:51 Martin Knoblauch
2008-01-17 17:44 Martin Knoblauch
2008-01-17 20:23 ` Mel Gorman
2008-01-17 13:52 Martin Knoblauch
2008-01-17 16:11 ` Mike Snitzer
2008-01-16 14:15 Martin Knoblauch
2008-01-16 16:27 ` Mike Snitzer
2008-01-16 9:26 Martin Knoblauch
[not found] ` <E1JF6w8-0000vs-HM@localhost.localdomain>
2008-01-16 12:00 ` Fengguang Wu
2008-01-07 10:51 Joerg Platte
2008-01-07 11:19 ` Ingo Molnar
2008-01-07 13:24 ` Joerg Platte
2008-01-07 13:32 ` Peter Zijlstra
2008-01-07 13:40 ` Joerg Platte
[not found] ` <E1JCRbA-0002bh-3c@localhost.localdomain>
2008-01-09 3:27 ` Fengguang Wu
2008-01-09 6:13 ` Joerg Platte
[not found] ` <E1JCZg2-0001DE-RP@localhost.localdomain>
2008-01-09 12:04 ` Fengguang Wu
2008-01-09 12:22 ` Joerg Platte
[not found] ` <E1JCaUd-0001Ko-Tt@localhost.localdomain>
2008-01-09 12:57 ` Fengguang Wu
2008-01-09 13:04 ` Joerg Platte
[not found] ` <E1JCrMj-0001HR-SZ@localhost.localdomain>
2008-01-10 6:58 ` Fengguang Wu
[not found] ` <E1JCrsE-0000v4-Dz@localhost.localdomain>
2008-01-10 7:30 ` Fengguang Wu
[not found] ` <20080110073046.GA3432@mail.ustc.edu.cn>
[not found] ` <E1JCsDr-0002cl-0e@localhost.localdomain>
2008-01-10 7:53 ` Fengguang Wu
2008-01-10 8:37 ` Joerg Platte
[not found] ` <E1JCt0n-00048n-AD@localhost.localdomain>
2008-01-10 8:43 ` Fengguang Wu
2008-01-10 10:03 ` Joerg Platte
[not found] ` <E1JDBk4-0000UF-03@localhost.localdomain>
2008-01-11 4:43 ` Fengguang Wu
2008-01-11 5:29 ` Joerg Platte
2008-01-11 6:41 ` Joerg Platte
2008-01-12 23:32 ` Joerg Platte
[not found] ` <E1JDwaA-00017Q-W6@localhost.localdomain>
2008-01-13 6:44 ` Fengguang Wu
2008-01-13 8:05 ` Joerg Platte
[not found] ` <E1JDy5a-0001al-Tk@localhost.localdomain>
2008-01-13 8:21 ` Fengguang Wu
2008-01-13 9:49 ` Joerg Platte
[not found] ` <E1JE1Uz-0002w5-6z@localhost.localdomain>
2008-01-13 11:59 ` Fengguang Wu
[not found] ` <20080113115933.GA11045@mail.ustc.edu.cn>
[not found] ` <E1JEGPH-0001uw-Df@localhost.localdomain>
2008-01-14 3:54 ` Fengguang Wu
[not found] ` <20080114035439.GA7330@mail.ustc.edu.cn>
[not found] ` <E1JEM2I-00010S-5U@localhost.localdomain>
2008-01-14 9:55 ` Fengguang Wu
2008-01-14 11:30 ` Joerg Platte
2008-01-14 11:41 ` Peter Zijlstra
[not found] ` <E1JEOmD-0001Ap-U7@localhost.localdomain>
2008-01-14 12:50 ` Fengguang Wu
2008-01-15 21:13 ` Mike Snitzer
[not found] ` <E1JF0m1-000101-OK@localhost.localdomain>
2008-01-16 5:25 ` Fengguang Wu
2008-01-15 21:42 ` Ingo Molnar
[not found] ` <E1JF0bJ-0000zU-FG@localhost.localdomain>
2008-01-16 5:14 ` Fengguang Wu
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