From: bgamari@gmail.com (Ben Gamari)
Subject: [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency
Date: Tue, 20 Jan 2009 23:38:19 -0500 [thread overview]
Message-ID: <720e76b80901202038p1e1f929ci56e9f35c5a629c88@mail.gmail.com> (raw)
In-Reply-To: <20090121002507.GA12616@Krystal>
On Tue, Jan 20, 2009 at 7:25 PM, Mathieu Desnoyers
<mathieu.desnoyers at polymtl.ca> wrote:
> * Mathieu Desnoyers (mathieu.desnoyers at polymtl.ca) wrote:
>
> As a side-note : I'd like to have my results confirmed by others.
Well, I think the (fixed) patch did help to some degree (I haven't
done fio benchmarks to compare against yet). Unfortunately, the I/O
wait time problem still remains. I have been waiting 3 minutes now for
evolution to start with 88% I/O wait time yet no visible signs of
progress. I've confirmed I'm using the CFQ scheduler, so that's not
the problem.
Also, Jens, I'd just like to point out that the problem is
reproducible across all schedulers. Does your patch seek to tackle a
problem specific to the CFQ scheduler, leaving the I/O wait issue for
later? Just wondering.
I'll post some benchmarks numbers once I have them. Thanks,
- Ben
next prev parent reply other threads:[~2009-01-21 4:38 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-17 0:44 [ltt-dev] [Regression] High latency when doing large I/O Mathieu Desnoyers
2009-01-17 16:26 ` [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency Mathieu Desnoyers
2009-01-17 16:50 ` Leon Woestenberg
2009-01-17 17:15 ` Mathieu Desnoyers
2009-01-17 19:04 ` Jens Axboe
2009-01-18 21:12 ` Mathieu Desnoyers
2009-01-18 21:27 ` Mathieu Desnoyers
2009-01-19 18:26 ` Jens Axboe
2009-01-20 2:10 ` Mathieu Desnoyers
2009-01-20 7:37 ` Jens Axboe
2009-01-20 12:28 ` Jens Axboe
2009-01-20 14:22 ` Mathieu Desnoyers
2009-01-20 14:24 ` Jens Axboe
2009-01-20 15:42 ` Mathieu Desnoyers
2009-01-20 23:06 ` Mathieu Desnoyers
2009-01-20 23:27 ` Mathieu Desnoyers
2009-01-21 0:25 ` Mathieu Desnoyers
2009-01-21 4:38 ` Ben Gamari [this message]
2009-01-21 4:54 ` Mathieu Desnoyers
2009-01-21 6:17 ` Ben Gamari
2009-01-22 22:59 ` Mathieu Desnoyers
2009-01-23 3:21 ` KOSAKI Motohiro
2009-01-23 4:03 ` Mathieu Desnoyers
2009-02-10 3:36 ` [ltt-dev] [PATCH] mm fix page writeback accounting to fix oom condition under heavy I/O Mathieu Desnoyers
2009-02-10 3:55 ` Nick Piggin
2009-02-10 5:23 ` Linus Torvalds
2009-02-10 5:56 ` Nick Piggin
2009-02-10 6:12 ` Mathieu Desnoyers
2009-02-02 2:08 ` [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency Mathieu Desnoyers
2009-02-02 11:26 ` Jens Axboe
2009-02-03 0:46 ` Mathieu Desnoyers
2009-01-20 13:45 ` Mathieu Desnoyers
2009-01-20 20:22 ` Ben Gamari
2009-01-20 22:23 ` Ben Gamari
2009-01-20 23:05 ` Mathieu Desnoyers
2009-01-22 2:35 ` Ben Gamari
2009-01-19 15:45 ` Nikanth K
2009-01-19 18:23 ` Jens Axboe
2009-01-17 20:03 ` Ben Gamari
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