linux-ext4 - Re: [PATCH] mballoc: allocate stripe-multiple IOs on stripe boundaries

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Message-ID: <20100726225223.GB14072@thunk.org>
Date:	Mon, 26 Jul 2010 18:52:23 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Mike Snitzer <snitzer@...hat.com>
Subject: Re: [PATCH] mballoc: allocate stripe-multiple IOs on stripe
 boundaries

On Wed, Jul 14, 2010 at 04:10:23PM -0500, Eric Sandeen wrote:
> For some reason, today mballoc only allocates IOs which are exactly
> stripe-sized on a stripe boundary.  If you have a multiple (say, a
> 128k IO on a 64k stripe) you may end up unaligned.
> 
> It seems to me that a simple change to align stripe-multiple IOs
> on stripe boundaries would be a very good idea, unless this breaks
> some other mballoc heuristic for some reason...

I've added this to the ext4 tree, thanks.

						- Ted
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