From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Martin Boutin <martboutin@gmail.com>,
"Kernel.org-Linux-RAID" <linux-raid@vger.kernel.org>,
Eric Sandeen <sandeen@redhat.com>,
"Kernel.org-Linux-EXT4" <linux-ext4@vger.kernel.org>,
xfs-oss <xfs@oss.sgi.com>
Subject: Re: Filesystem writes on RAID5 too slow
Date: Tue, 10 Dec 2013 11:18:03 -0800 [thread overview]
Message-ID: <20131210191803.GA31162@infradead.org> (raw)
In-Reply-To: <20131121234116.GD6502@dastard>
> xfs: align initial file allocations correctly.
>
> From: Dave Chinner <dchinner@redhat.com>
>
> The function xfs_bmap_isaeof() is used to indicate that an
> allocation is occurring at or past the end of file, and as such
> should be aligned to the underlying storage geometry if possible.
>
> Commit 27a3f8f ("xfs: introduce xfs_bmap_last_extent") changed the
> behaviour of this function for empty files - it turned off
> allocation alignment for this case accidentally. Hence large initial
> allocations from direct IO are not getting correctly aligned to the
> underlying geometry, and that is cause write performance to drop in
> alignment sensitive configurations.
>
> Fix it by considering allocation into empty files as requiring
> aligned allocation again.
Seems like this one didn't get picked up yet?
next prev parent reply other threads:[~2013-12-10 19:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-18 16:02 Filesystem writes on RAID5 too slow Martin Boutin
2013-11-18 18:28 ` Eric Sandeen
2013-11-19 0:57 ` Dave Chinner
2013-11-21 9:11 ` Martin Boutin
2013-11-21 9:26 ` Dave Chinner
2013-11-21 9:50 ` Martin Boutin
2013-11-21 13:31 ` Martin Boutin
2013-11-21 16:35 ` Martin Boutin
2013-11-21 23:41 ` Dave Chinner
2013-11-22 9:21 ` Christoph Hellwig
2013-11-22 22:40 ` Dave Chinner
2013-11-23 8:41 ` Christoph Hellwig
2013-11-24 23:21 ` Dave Chinner
2013-11-22 13:33 ` Martin Boutin
2013-12-10 19:18 ` Christoph Hellwig [this message]
2013-12-11 0:27 ` Dave Chinner
2013-12-11 19:09 ` Ben Myers
2013-11-18 18:41 ` Roman Mamedov
2013-11-18 19:25 ` Roman Mamedov
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