linux-kernel - Re: RFC: dirty

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Message-Id: <20100521100943.1E4D.A69D9226@jp.fujitsu.com>
Date:	Fri, 21 May 2010 10:11:59 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Zan Lynx <zlynx@....org>
Cc:	kosaki.motohiro@...fujitsu.com, lwoodman@...hat.com,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Nick Piggin <npiggin@...e.de>,
	Jan Kara <jack@...e.cz>
Subject: Re: RFC: dirty_ratio back to 40%

> > So, I'd prefer to restore the default rather than both Redhat and SUSE apply exactly
> > same distro specific patch. because we can easily imazine other users will face the same
> > issue in the future.
> 
> On desktop systems the low dirty limits help maintain interactive feel. 
> Users expect applications that are saving data to be slow. They do not 
> like it when every application in the system randomly comes to a halt 
> because of one program stuffing data up to the dirty limit.

really?
Do you mean our per-task dirty limit wouldn't works?

If so, I think we need fix it. IOW sane per-task dirty limitation seems independent issue 
from per-system dirty limit.


> The cause and effect for the system slowdown is clear when the dirty 
> limit is low. "I saved data and now the system is slow until it is 
> done." When the dirty page ratio is very high, the cause and effect is 
> disconnected. "I was just web surfing and the system came to a halt."
> 
> I think we should expect server admins to do more tuning than desktop 
> users, so the default limits should stay low in my opinion.


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