linux-kernel - Re: performance regression from block merge

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Message-ID: <20061221193549.GF17199@kernel.dk>
Date:	Thu, 21 Dec 2006 20:35:50 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>
Subject: Re: performance regression from block merge

On Thu, Dec 21 2006, Andrew Morton wrote:
> 
> 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.

About when? I'll double check and test here, I'm assuming you mean since
2.6.19?

> 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 ;)

I usually try and make sure that for-akpm is the same as for-linus, so
if you pull that then it'll go to -mm as well. Sometimes the window
isn't that big, I'll try and make sure it's seen at least one -mm before
going upstream.

-- 
Jens Axboe

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