linux-kernel - Re: la la la la ... swappiness

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Message-ID: <Pine.LNX.4.64.0612040900210.31485@schroedinger.engr.sgi.com>
Date:	Mon, 4 Dec 2006 09:03:59 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Linus Torvalds <torvalds@...l.org>
cc:	Andrew Morton <akpm@...l.org>, Aucoin@...ston.rr.com,
	"'Tim Schmielau'" <tim@...sik3.uni-rostock.de>,
	linux-kernel@...r.kernel.org, pj@....com
Subject: Re: la la la la ... swappiness

On Sun, 3 Dec 2006, Linus Torvalds wrote:

> Wouldn't it be much nicer to just lower the dirty-page limit?
> 
> 	echo 1 > /proc/sys/vm/dirty_background_ratio
> 	echo 2 > /proc/sys/vm/dirty_ratio

Dirty ratio cannot be set to less than 5%. See 
mm/page-writeback.c:get_dirty_limits().

> or something. Which we already discussed in another thread and almost 
> already decided we should lower the values for big-mem machines..

We also have an issue with cpusets. Dirty page throttling does not work in 
a cpuset if it is relatively small to the total memory on the system since 
we calculate the percentage of the total memory and not a percentage of 
the memory the process is allowed to use.
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