From: Jens Axboe <jens.axboe@oracle.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
davej@redhat.com, tim.c.chen@linux.intel.com,
linux-kernel@vger.kernel.org, torvalds@linux-foundation.org
Subject: Re: Change in default vm_dirty_ratio
Date: Wed, 20 Jun 2007 11:14:04 +0200 [thread overview]
Message-ID: <20070620091404.GO18863@kernel.dk> (raw)
In-Reply-To: <20070620015826.03f1d71a.akpm@linux-foundation.org>
On Wed, Jun 20 2007, Andrew Morton wrote:
> Perhaps our queues are too long - if the VFS _does_ back off, it'll take
> some time for that to have an effect.
>
> Perhaps the fact that the queue size knows nothing about the _size_ of the
> requests in the queue is a problem.
It's complicated, the size may not matter a lot. 128 sequential 512kb IO
may complete faster than 128 random 4kb IO's.
> Back away even further here.
>
> What user-visible problem(s) are we attemping to fix?
I'd like innocent-app-doing-little-write-or-fsync not being stalled by
big-bad-app-doing-lots-of-dirtying.
--
Jens Axboe
next prev parent reply other threads:[~2007-06-20 9:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-18 21:14 Change in default vm_dirty_ratio Tim Chen
2007-06-18 23:47 ` Andrew Morton
2007-06-19 0:06 ` Linus Torvalds
2007-06-19 0:09 ` Arjan van de Ven
2007-06-19 18:41 ` John Stoffel
2007-06-19 19:04 ` Linus Torvalds
2007-06-19 19:06 ` Linus Torvalds
2007-06-19 22:33 ` David Miller
2007-06-19 19:57 ` Andi Kleen
2007-06-20 4:24 ` Dave Jones
2007-06-20 4:44 ` Andrew Morton
2007-06-20 8:35 ` Peter Zijlstra
2007-06-20 8:58 ` Andrew Morton
2007-06-20 9:14 ` Jens Axboe [this message]
2007-06-20 9:19 ` Peter Zijlstra
2007-06-20 9:20 ` Jens Axboe
2007-06-20 9:43 ` Peter Zijlstra
2007-06-21 22:53 ` Matt Mackall
2007-06-21 23:08 ` Linus Torvalds
2007-06-23 18:23 ` Peter Zijlstra
2007-06-24 16:40 ` Linus Torvalds
2007-06-25 0:15 ` Peter Zijlstra
2007-06-20 9:19 ` Peter Zijlstra
2007-06-21 16:54 ` Mark Lord
2007-06-21 16:55 ` Peter Zijlstra
2007-06-20 17:17 ` Linus Torvalds
2007-06-20 18:12 ` Arjan van de Ven
2007-06-20 18:28 ` Linus Torvalds
2007-06-21 12:37 ` Nadia Derbey
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