linux-kernel - Re: Change in default vm_dirty

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Message-ID: <20070620091404.GO18863@kernel.dk>
Date:	Wed, 20 Jun 2007 11:14:04 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Peter Zijlstra <peterz@...radead.org>, davej@...hat.com,
	tim.c.chen@...ux.intel.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org
Subject: Re: Change in default vm_dirty_ratio

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

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