linux-kernel - Re: [PATCH 01/35] writeback: enabling gate limit for light dirtied bdi

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Date:	Thu, 13 Jan 2011 20:26:10 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Christoph Hellwig <hch@....de>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Dave Chinner <david@...morbit.com>,
	Theodore Ts'o <tytso@....edu>,
	Chris Mason <chris.mason@...cle.com>,
	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	linux-mm <linux-mm@...ck.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/35] writeback: enabling gate limit for light dirtied
 bdi

On Thu, 2011-01-13 at 11:44 +0800, Wu Fengguang wrote:
> When testing 10-disk JBOD setup, I
> find that bdi_dirty_limit fluctuations too much. So I'm considering
> use global_dirty_limit as control target. 

Is this because the bandwidth is equal or larger than the dirty period?


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