linux-kernel - Re: [PATCH 05/18] writeback: per task dirty rate limit

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Message-ID: <20110907110022.GA6012@localhost>
Date:	Wed, 7 Sep 2011 19:00:22 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 05/18] writeback: per task dirty rate limit

On Wed, Sep 07, 2011 at 03:31:56PM +0800, Peter Zijlstra wrote:
> On Wed, 2011-09-07 at 09:04 +0800, Wu Fengguang wrote:
> 
> > So the sqrt naturally leads to less overheads and more N tolerance for
> > large memory servers, which have large (thresh-freerun) gaps.
> 
> Thanks, and as you say its an initial guess, later refined using patch
> 14.

Yes, exactly.
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