From: tytso@mit.edu
To: Christian Kujau <lists@nerdbynature.de>
Cc: Peter Grandi <pg_jf2@jf2.for.sabi.co.UK>,
xfs@oss.sgi.com, reiserfs-devel@vger.kernel.org,
linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org,
jfs-discussion@lists.sourceforge.net,
ext-users <ext3-users@redhat.com>,
linux-nilfs@vger.kernel.org
Subject: Re: [Jfs-discussion] benchmark results
Date: Fri, 25 Dec 2009 11:14:53 -0500 [thread overview]
Message-ID: <20091225161453.GD32757@thunk.org> (raw)
In-Reply-To: <alpine.DEB.2.01.0912241739160.3483@bogon.housecafe.de>
On Thu, Dec 24, 2009 at 05:52:34PM -0800, Christian Kujau wrote:
>
> Well, I do "sync" after each operation, so the data should be on disk, but
> that doesn't mean it'll clear the filesystem buffers - but this doesn't
> happen that often in the real world too. Also, all filesystem were tested
> equally (I hope), yet some filesystem perform better than another - even
> if all the content copied/tar'ed/removed would perfectly well fit into the
> machines RAM.
Did you include the "sync" in part of what you timed? Peter was quite
right --- the fact that the measured bandwidth in your "cp" test is
five times faster than the disk bandwidth as measured by hdparm, and
many file systems had exactly the same bandwidth, makes me very
suspicious that what was being measured was primarily memory bandwidth
--- and not very useful when trying to measure file system
performance.
- Ted
next prev parent reply other threads:[~2009-12-25 16:15 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-24 10:31 benchmark results Christian Kujau
2009-12-24 12:06 ` Ryusuke Konishi
2009-12-24 12:59 ` Teran McKinney
2009-12-24 20:01 ` Christian Kujau
2009-12-24 13:05 ` Peter Grandi
2009-12-24 21:27 ` [Jfs-discussion] " tytso
2009-12-24 23:46 ` Evgeniy Polyakov
2009-12-25 16:11 ` tytso
2010-01-04 16:27 ` Chris Mason
2010-01-04 18:57 ` Michael Rubin
2010-01-05 0:41 ` Dave Chinner
2010-01-05 15:31 ` Steven Pratt
2009-12-25 1:52 ` Christian Kujau
2009-12-25 13:19 ` lakshmi pathi
2009-12-25 16:14 ` tytso [this message]
2009-12-25 16:22 ` Larry McVoy
2009-12-25 16:33 ` tytso
2009-12-25 18:51 ` Christian Kujau
2009-12-26 16:00 ` jim owens
2009-12-26 19:06 ` Christian Kujau
2009-12-27 19:50 ` jim owens
2009-12-27 21:55 ` Christian Kujau
2009-12-27 22:33 ` tytso
2009-12-28 1:24 ` Christian Kujau
2009-12-28 14:08 ` Larry McVoy
2010-01-15 21:42 ` Edward Shishkin
2009-12-26 19:19 ` tytso
[not found] ` <20091225163341.GE32757@thunk.org>
2009-12-25 18:56 ` Christian Kujau
2009-12-25 19:32 ` Christian Kujau
2010-01-11 1:03 ` Casey Allen Shobe
2010-01-11 1:32 ` Larry McVoy
2009-12-25 18:42 ` Christian Kujau
2009-12-29 11:27 ` Emmanuel Florac
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