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Message-ID: <20080122143933.GA11111@agk.fab.redhat.com> Date: Tue, 22 Jan 2008 14:39:33 +0000 From: Alasdair G Kergon <agk@...hat.com> To: Martin Knoblauch <spamtrap@...bisoft.de> Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Mel Gorman <mel@....ul.ie>, Fengguang Wu <wfg@...l.ustc.edu.cn>, Mike Snitzer <snitzer@...il.com>, Peter Zijlstra <peterz@...radead.org>, jplatte@...sa.net, Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, James.Bottomley@...eleye.com, Jens Axboe <jens.axboe@...cle.com>, Milan Broz <mbroz@...hat.com>, Neil Brown <neilb@...e.de> Subject: Re: regression: 100% io-wait with 2.6.24-rcX 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@...hat.com - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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