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Re: [PATCH 0/8][RFC] IO latency/throughput fixes

From:  Theodore Tso <tytso-AT-mit.edu>
To:  Linus Torvalds <torvalds-AT-linux-foundation.org>
Subject:  Re: [PATCH 0/8][RFC] IO latency/throughput fixes
Date:  Mon, 6 Apr 2009 14:31:57 -0400
Message-ID:  <20090406183157.GD7376@mit.edu>
Cc:  Jens Axboe <jens.axboe-AT-oracle.com>, Linux Kernel Mailing List <linux-kernel-AT-vger.kernel.org>
Archive-link:  Article

On Mon, Apr 06, 2009 at 08:45:09AM -0700, Linus Torvalds wrote:
> 
> With that request size limiting, my fsync pauses tend to be in the 250ms 
> range, with a one 0.75s outlier in the last few minutes. I can definitely 
> feel that quarter-second thing, and the .75s pause was a real stutter, but 
> boy what a difference. I don't get the uncontrollable urge to kill that 
> nasty background writer any more.

Cool!  Maybe we can make things even better, but given where we are
at, this brings up an question: given Jens block latency patches
(thanks, Jens!), and the patches which add the flush on
replace-via-rename/replace-via-truncate for ext3 data=writeback,
should we make ext3 data=writeback the default for 2.6.30?

					- Ted


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