linux-ext4 - Re: [PATCH] e2fsprogs: don't set stripe/stride to 1 block in mkfs

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Message-ID: <20110518172024.GF29368@thunk.org>
Date:	Wed, 18 May 2011 13:20:24 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Zeev Tarantov <zeev.tarantov@...il.com>
Subject: Re: [PATCH] e2fsprogs: don't set stripe/stride to 1 block in mkfs

On Mon, Apr 04, 2011 at 03:11:52PM -0400, Eric Sandeen wrote:
> Block devices may set minimum or optimal IO hints equal to
> blocksize; in this case there is really nothing for ext4
> to do with this information (i.e. search for a block-aligned
> allocation?) so don't set fs geometry with single-block
> values.
> 
> Zeev also reported that with a block-sized stripe, the
> ext4 allocator spends time spinning in ext4_mb_scan_aligned(),
> oddly enough.
> 
> Reported-by: Zeev Tarantov <zeev.tarantov@...il.com>
> Signed-off-by: Eric Sandeen <sandeen@...hat.com>

Applied to the maint branch of e2fsprogs (which will be merged up to
the next/master branches), thanks!!

						- Ted
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