linux-kernel - Re: [RFC PATCH] block: Fix bio merge induced high I/O latency

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Date:	Tue, 20 Jan 2009 15:22:12 -0500
From:	Ben Gamari <bgamari@...il.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Andrea Arcangeli <andrea@...e.de>, akpm@...ux-foundation.org,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, ltt-dev@...ts.casi.polymtl.ca
Subject: Re: [RFC PATCH] block: Fix bio merge induced high I/O latency

On Tue, Jan 20, 2009 at 2:37 AM, Jens Axboe <jens.axboe@...cle.com> wrote:
> On Mon, Jan 19 2009, Mathieu Desnoyers wrote:
>> * Jens Axboe (jens.axboe@...cle.com) wrote:
>> Yes, ideally I should re-run those directly on the disk partitions.
>
> At least for comparison.
>

I just completed my own set of benchmarks using the fio job file
Mathieu provided. This was on a 2.5 inch 7200 RPM SATA partition
formatted as ext3. As you can see, I tested all of the available
schedulers with both queuing enabled and disabled. I'll test the Jens'
patch soon. Would a blktrace of the fio run help? Let me know if
there's any other benchmarking or profiling that could be done.
Thanks,

- Ben


			mint		maxt
==========================================================
queue_depth=31:
anticipatory		35 msec		11036 msec
cfq			37 msec		3350 msec
deadline		36 msec		18144 msec
noop			39 msec		41512 msec

==========================================================
queue_depth=1:
anticipatory		45 msec		9561 msec
cfq			28 msec		3974 msec
deadline		47 msec		16802 msec
noop			35 msec		38173 msec
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