From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Sandeen <sandeen@redhat.com>
Subject: Re: EXT4 is ~2X as slow as XFS (593MB/s vs 304MB/s) for writes?
Date: Fri, 26 Feb 2010 19:28:40 -0600
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Cc: linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org,
	Alan Piszcz <ap@solarrain.com>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
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Eric Sandeen wrote:
> Justin Piszcz wrote:
> ...
> 
>>> Were the filesystems created to align with raid geometry?
>> Only default options were used except the mount options.  If that is the
>> culprit, I have some more testing to do, thanks, will look into it.
>>
>>> mkfs.xfs has done that forever; mkfs.ext4 only will do so (automatically)
>>> with recent kernel+e2fsprogs.
>> How recent?
> 
> You're recent enough.  :)

Oh, you need very recent util-linux-ng as well, and use libblkid from there
with:

[e2fsprogs] # ./configure --disable-libblkid

Otherwise you can just feed mkfs.ext4 stripe & stride manually.

-Eric