From: Josef Bacik <jbacik@fusionio.com>
To: John Williams <jwilliams4200@gmail.com>
Cc: <linux-btrfs@vger.kernel.org>
Subject: Re: Why does btrfs benchmark so badly in this case?
Date: Thu, 8 Aug 2013 13:29:57 -0400 [thread overview]
Message-ID: <20130808172957.GG16712@localhost.localdomain> (raw)
In-Reply-To: <CAJBj3vcfSrWC3sxxxin93GYYPZY_z_MJnAHoMxB45MFqEXYXkA@mail.gmail.com>
On Thu, Aug 08, 2013 at 09:13:04AM -0700, John Williams wrote:
> Phoronix periodically runs benchmarks on filesystems, and one thing I
> have noticed is that btrfs always does terribly on their fio "Intel
> IOMeter fileserver access pattern" benchmark:
>
> http://www.phoronix.com/scan.php?page=article&item=linux_310_10fs&num=2
>
> Here, btrfs is more than 6 times slower than ext4, and about 3 times
> slower than XFS.
>
> Lest we attribute it to an unavoidable downside of COW filesystems and
> move on...no, we cannot do that, because ZFS does well here -- btrfs
> is about 6 times slower than ZFS!
>
> Note that btrfs does quite well in the other Phoronix benchmarks. It
> is just the fio fileserver benchmark that btrfs has problems with.
>
> What is going on here? Why is btrfs doing so poorly?
Excellent question, I'll get back to you on that. Thanks,
Josef
next prev parent reply other threads:[~2013-08-08 17:29 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-08 16:13 Why does btrfs benchmark so badly in this case? John Williams
2013-08-08 17:29 ` Josef Bacik [this message]
2013-08-08 18:37 ` Clemens Eisserer
2013-08-08 19:40 ` Josef Bacik
2013-08-08 20:23 ` John Williams
2013-08-08 20:38 ` Josef Bacik
2013-08-09 21:35 ` Kai Krakow
2013-08-12 13:48 ` Josef Bacik
2013-08-08 20:59 ` Chris Murphy
2013-08-08 21:25 ` Zach Brown
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