From: Wu Fengguang <fengguang.wu@intel.com>
To: Aidar Kultayev <the.aidar@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>, Ted Ts'o <tytso@mit.edu>,
Pekka Enberg <penberg@kernel.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Nick Piggin <npiggin@suse.de>,
Arjan van de Ven <arjan@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: 2.6.36 io bring the system to its knees
Date: Sun, 31 Oct 2010 09:51:32 +0800 [thread overview]
Message-ID: <20101031015132.GA10086@localhost> (raw)
In-Reply-To: <20101031012224.GA8007@localhost>
> > How do I notice slowdowns ? The JuK lags so badly that it can't play
> > any music, the mouse pointer freezes, kwin effects freeze for few
> > seconds.
> > How can I make it much worse ? I can try & run disk clean up under XP,
> > that is running in VBox, with folder compression. On top of it if I
> > start copying big files in linux ( 700MB avis, etc ), GUI effects
> > freeze, mouse pointer freezes for few seconds.
It may also help to lower the dirty ratio.
echo 5 > /proc/sys/vm/dirty_ratio
Memory pressure + heavy write can easily hurt responsiveness.
- eats up to 20% (the default value for dirty_ratio) memory with dirty
pages and hence increase the memory pressure and number of swap IO
- the file copy makes the device write congested and hence makes
pageout() easily blocked in get_request_wait()
As a result every application may be slowed down by the heavy swap IO
when page fault as well as being blocked when allocating memory (which
may go into direct reclaim and then call pageout()).
Thanks,
Fengguang
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next prev parent reply other threads:[~2010-10-31 1:51 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTimt7wzR9RwGWbvhiOmot_zzayfCfSh_-v6yvuAP@mail.gmail.com>
[not found] ` <AANLkTikRKVBzO=ruy=JDmBF28NiUdJmAqb4-1VhK0QBX@mail.gmail.com>
[not found] ` <AANLkTinzJ9a+9w7G5X0uZpX2o-L8E6XW98VFKoF1R_-S@mail.gmail.com>
2010-10-28 6:09 ` 2.6.36 io bring the system to its knees Aidar Kultayev
2010-10-28 6:32 ` Pekka Enberg
2010-10-28 9:00 ` Ingo Molnar
2010-10-28 9:34 ` Pekka Enberg
2010-10-28 11:16 ` Pekka Enberg
2010-10-28 11:33 ` Aidar Kultayev
2010-10-28 11:48 ` Pekka Enberg
2010-10-28 12:18 ` Aidar Kultayev
2010-10-28 13:46 ` Christoph Hellwig
2010-10-28 13:54 ` Ingo Molnar
2010-10-28 13:30 ` Ingo Molnar
2010-10-28 13:47 ` Christoph Hellwig
2010-10-28 13:50 ` Ingo Molnar
2010-10-28 17:01 ` Chris Mason
2010-10-28 17:57 ` Pekka Enberg
2010-10-29 14:52 ` Ted Ts'o
2010-10-29 15:33 ` Aidar Kultayev
2010-10-30 9:14 ` Ingo Molnar
2010-10-30 13:02 ` Aidar Kultayev
2010-10-30 19:06 ` Chris Mason
2010-10-31 2:31 ` Ted Ts'o
2010-10-31 17:49 ` Corrado Zoccolo
2010-11-02 3:10 ` Shaohua Li
2010-11-02 11:47 ` Sanjoy Mahajan
2010-11-02 13:12 ` Chris Mason
2010-11-04 16:05 ` Sanjoy Mahajan
2010-11-04 23:35 ` Steven Barrett
2010-11-04 23:44 ` Jesper Juhl
2010-11-04 23:48 ` Jesper Juhl
2010-11-05 1:43 ` Dave Chinner
2010-11-05 12:48 ` Sanjoy Mahajan
2010-11-06 14:10 ` dave b
2010-11-06 15:12 ` Dave Chinner
2010-11-07 6:06 ` dave b
2010-11-07 12:08 ` Jens Axboe
2010-11-07 15:50 ` Linus Torvalds
2010-11-10 1:32 ` Dave Chinner
2010-11-10 2:01 ` dave b
2010-11-10 8:08 ` Evgeniy Ivanov
2010-11-10 8:24 ` Dave Chinner
2010-11-10 14:22 ` Pavel Machek
2010-11-10 14:20 ` Pavel Machek
2010-11-10 14:27 ` Ingo Molnar
2010-11-10 14:55 ` Christoph Hellwig
2010-11-10 19:09 ` Pavel Machek
2010-11-10 14:33 ` Theodore Tso
2010-11-10 14:57 ` Christoph Hellwig
2010-11-10 15:00 ` Chris Mason
2010-11-10 23:36 ` Dave Chinner
2010-11-10 15:59 ` Linus Torvalds
2010-11-10 16:46 ` Alexey Dobriyan
2010-11-10 16:55 ` Linus Torvalds
2010-11-10 17:10 ` Alexey Dobriyan
2010-11-10 18:55 ` Mark Lord
2010-11-10 18:27 ` Mike Galbraith
2010-11-10 23:43 ` Dave Chinner
2010-11-06 19:10 ` Arjan van de Ven
2010-11-07 17:16 ` Jesper Juhl
2010-11-09 19:47 ` Evgeniy Ivanov
2010-11-09 20:20 ` Christoph Hellwig
2010-11-09 21:00 ` Chris Mason
2010-10-31 1:22 ` Wu Fengguang
2010-10-31 1:51 ` Wu Fengguang [this message]
2010-11-01 1:09 ` Dimitrios Apostolou
2010-11-02 1:20 ` Wu Fengguang
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