linux-kernel - performance regression from block merge

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Message-Id: <20061221112540.e4ba58bc.akpm@osdl.org>
Date:	Thu, 21 Dec 2006 11:25:40 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>
Subject: performance regression from block merge

Jens, elapsed time for `mke2fs /dev/hdc5' with the anticipatory scheduler
(at least) has gone from nine seconds to sixty as a result of the recent
block merge.

This is the enty enth time that block code has been slammed into mainline
without having had exposure to -mm testers or even to me personally, and it
it the second time (at least) that obvious regressions have occurred as a
result.  I have a New Year's resolution for you ;)
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