From: Chris Mason <chris.mason@fusionio.com>
To: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <clmason@fusionio.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ric Wheeler <rwheeler@redhat.com>, Ingo Molnar <mingo@kernel.org>,
Christoph Hellwig <hch@infradead.org>,
Martin Steigerwald <Martin@lichtvoll.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Theodore Ts'o" <tytso@mit.edu>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH, 3.7-rc7, RESEND] fs: revert commit bbdd6808 to fallocate UAPI
Date: Fri, 7 Dec 2012 20:39:49 -0500 [thread overview]
Message-ID: <20121208013949.GD25713@shiny> (raw)
In-Reply-To: <20121208001705.GO27172@dastard>
On Fri, Dec 07, 2012 at 05:17:05PM -0700, Dave Chinner wrote:
> On Fri, Dec 07, 2012 at 02:03:06PM -0500, Chris Mason wrote:
[ dead and beaten fallocate ponies ]
>
> > On a single flash drive doing random 4K writes, xfs does 950MB/s into
> > regular extents but only 400MB/s into preallocated extents.
> >
> > http://masoncoding.com/presentation/perf-linuxcon12/fallocate.png
>
> This is bordering on irrelevancy, but can you provide the workload
> you were running to generate this graph? Random 4k writes could be
> anything, really.
This one was fio aio/dio, I'll dig out the job file and rerun it on
3.7-rc on Monday. Any real random write is going to show this with
enough load.
>
> In my experience, applications that actually do processing between
> random write IOs don't see anywhere near the same degradation as
> such micro-benchmarks tend to indicate can occur with unwritten
> extents. Are you seeing this level of degradation in real-world applications?
> If you give me a reason to fix it (and the hardware to test it on),
> I'm pretty sure I can bring the overhead down to just a few percent
> on fully featured SSDs like FusionIO devices...
We should have a card I can send, drop me the address.
For the workload...that's harder. We can talk all day about what a
normal random write workload is, but if you have a fio job that you
think represents real world, I can run that.
[ much nodding ;) ]
next prev parent reply other threads:[~2012-12-08 1:39 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-19 23:04 [PATCH] fs: revert commit bbdd6808 to fallocate UAPI Dave Chinner
2012-11-20 16:36 ` Christoph Hellwig
2012-11-26 0:28 ` [PATCH, 3.7-rc7, RESEND] " Dave Chinner
2012-11-26 2:55 ` Theodore Ts'o
2012-11-26 6:14 ` Tao Ma
2012-11-26 9:12 ` Dave Chinner
2012-12-05 10:48 ` Martin Steigerwald
2012-12-05 15:45 ` Linus Torvalds
2012-12-05 16:18 ` Martin Steigerwald
2012-12-05 16:33 ` Theodore Ts'o
2012-12-05 17:24 ` Martin Steigerwald
2012-12-05 17:34 ` Theodore Ts'o
2012-12-05 17:55 ` Martin Steigerwald
2012-12-06 0:42 ` Dave Chinner
2012-12-06 9:24 ` Martin Steigerwald
2012-12-05 18:25 ` Linus Torvalds
2012-12-06 1:14 ` Dave Chinner
2012-12-06 3:03 ` Linus Torvalds
2012-12-06 9:37 ` Martin Steigerwald
2012-12-07 1:08 ` Ingo Molnar
2012-12-07 2:40 ` Dave Chinner
2012-12-07 10:24 ` Martin Steigerwald
2012-12-06 12:06 ` Christoph Hellwig
2012-12-06 16:50 ` Theodore Ts'o
2012-12-07 1:57 ` Dave Chinner
2012-12-06 12:05 ` Christoph Hellwig
2012-12-07 1:16 ` Ingo Molnar
2012-12-07 3:19 ` Dave Chinner
2012-12-07 17:36 ` Ric Wheeler
2012-12-07 18:18 ` Linus Torvalds
2012-12-07 19:03 ` Chris Mason
2012-12-07 20:43 ` Theodore Ts'o
2012-12-07 21:09 ` Chris Mason
2012-12-07 21:27 ` Theodore Ts'o
2012-12-07 21:43 ` Chris Mason
2012-12-07 21:49 ` Ric Wheeler
2012-12-07 21:57 ` Chris Mason
2012-12-07 22:51 ` Eric Sandeen
2012-12-07 22:52 ` Eric Sandeen
2012-12-07 21:42 ` Ric Wheeler
2012-12-07 21:57 ` Theodore Ts'o
2012-12-07 22:02 ` Ric Wheeler
2012-12-08 0:39 ` Dave Chinner
2012-12-08 2:52 ` Joel Becker
2012-12-08 4:04 ` Dave Chinner
2012-12-08 0:17 ` Dave Chinner
2012-12-08 1:39 ` Chris Mason [this message]
2012-12-10 16:02 ` Chris Mason
2012-12-10 17:37 ` Theodore Ts'o
2012-12-10 18:05 ` Steven Whitehouse
2012-12-10 18:13 ` Theodore Ts'o
2012-12-10 18:20 ` Theodore Ts'o
2012-12-11 12:16 ` Steven Whitehouse
2012-12-11 22:09 ` Dave Chinner
2012-12-10 18:52 ` Ric Wheeler
2012-12-11 0:52 ` Dave Chinner
2012-12-07 19:30 ` Steven Rostedt
2012-12-07 21:14 ` Theodore Ts'o
2012-12-07 21:47 ` Ric Wheeler
2012-12-07 23:25 ` Howard Chu
2012-12-08 0:50 ` Dave Chinner
2012-12-08 13:52 ` Howard Chu
2012-12-08 14:02 ` Ric Wheeler
2012-12-07 22:01 ` Eric Sandeen
2012-12-09 21:37 ` Ric Wheeler
2012-11-26 11:53 ` Alan Cox
2012-11-26 14:43 ` Theodore Ts'o
2012-11-26 21:12 ` Dave Chinner
2012-11-27 13:44 ` Martin Steigerwald
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