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Date: Tue, 3 Nov 2009 21:42:30 +1100 From: "NeilBrown" <neilb@...e.de> To: "device-mapper development" <dm-devel@...hat.com>, akpm@...ux-foundation.org Cc: linux-fsdevel@...r.kernel.org, linux-raid@...r.kernel.org, "Laurent CORBES" <laurent.corbes@...rtjog.com>, linux-kernel@...r.kernel.org Subject: Re: [dm-devel] Re: Ext3 sequential read performance drop 2.6.29 -> 2.6.30,2.6.31,... On Tue, November 3, 2009 9:06 pm, Christoph Hellwig wrote: > On Mon, Nov 02, 2009 at 01:55:54PM -0800, Andrew Morton wrote: >> On Tue, 13 Oct 2009 12:09:55 +0200 >> Laurent CORBES <laurent.corbes@...rtjog.com> wrote: >> >> > Hi all, >> > >> > While benchmarking some systems I discover a big sequential read >> performance >> > drop using ext3 on ~ big files. The drop seems to be introduced in >> 2.6.30. I'm >> > testing with 2.6.28.6 -> 2.6.29.6 -> 2.6.30.4 -> 2.6.31.3. >> >> Seems that large performance regressions aren't of interest to this >> list :( > > No sure which list you mean, but dm-devel is for dm, not md. We're also > seeing similarly massive performance drops with md and ext3/xfs as > already reported on the list. Someone tracked it down to writeback > changes as usual, but there it got stuck. I'm still looking - running some basic tests on 4 filesystems over half a dozen recent kernels to see what has been happening. I have a suspicion that there a multiple problems. In particular, XFS has a strange degradation which was papered over by commit c8a4051c3731b. I'm beginning to wonder if it was caused by commit 17bc6c30cf6bf but I haven't actually tested that yet. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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