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Date: Wed, 1 Apr 2009 14:36:22 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: lsorense@...lub.uwaterloo.ca (Lennart Sorensen) Cc: torvalds@...ux-foundation.org, tytso@....edu, drees76@...il.com, jesper@...gh.cc, linux-kernel@...r.kernel.org Subject: Re: Linux 2.6.29 On Wed, 1 Apr 2009 17:03:38 -0400 lsorense@...lub.uwaterloo.ca (Lennart Sorensen) wrote: > On Thu, Mar 26, 2009 at 06:25:19PM -0700, Andrew Morton wrote: > > The JBD journal is a massive designed-in contention point. It's why > > for several years I've been telling anyone who will listen that we need > > a new fs. Hopefully our response to all these problems will soon be > > "did you try btrfs?". > > Oh I look forward to the day when it will be safe to convert my mythtv > box from ext3 to btrfs. Current kernels just have too much IO latency > with ext3 it seems. Older kernels were more responsive, but probably > had other places they were less efficient. Back in 2002ish I did a *lot* of work on IO latency, reads-vs-writes, etc, etc (but not fsync - for practical purposes it's unfixable on ext3-ordered) Performance was pretty good. From some of the descriptions I'm seeing get tossed around lately, I suspect that it has regressed. It would be useful/interesting if people were to rerun some of these tests with `echo anticipatory > /sys/block/sda/queue/scheduler'. Or with linux-2.5.60 :( -- 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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