From: nikanth@gmail.com (Nikanth K)
Subject: [ltt-dev] [RFC PATCH] block: Fix bio merge induced high I/O latency
Date: Mon, 19 Jan 2009 21:15:56 +0530 [thread overview]
Message-ID: <807b3a220901190745w79827b41u1cc9045a2ac268e5@mail.gmail.com> (raw)
In-Reply-To: <20090117190437.GZ30821@kernel.dk>
On Sun, Jan 18, 2009 at 12:34 AM, Jens Axboe <jens.axboe at oracle.com> wrote:
>
> As a quick test, could you try and increase the slice_idle to eg 20ms?
> Sometimes I've seen timing being slightly off, which makes us miss the
> sync window for the ls (in your case) process. Then you get a mix of
> async and sync IO all the time, which very much slows down the sync
> process.
>
Do you mean to say that 'ls' could not submit another request until
the previous sync request completes, but its idle window gets disabled
as it takes way too long to complete during heavy load? But when there
are requests in the driver, wont the idling be disabled anyway? Or did
you mean to increase slice_sync?
Thanks
Nikanth
next prev parent reply other threads:[~2009-01-19 15:45 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
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 [this message]
2009-01-19 18:23 ` Jens Axboe
2009-01-17 20:03 ` Ben Gamari
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