linux-kernel - Re: [PATCH 00/45] some writeback experiments

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Date:	Wed, 7 Oct 2009 22:45:02 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Li Shaohua <shaohua.li@...el.com>,
	Myklebust Trond <Trond.Myklebust@...app.com>,
	"jens.axboe@...cle.com" <jens.axboe@...cle.com>,
	Jan Kara <jack@...e.cz>, Nick Piggin <npiggin@...e.de>,
	linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/45] some writeback experiments

On Wed, Oct 07, 2009 at 10:26:32PM +0800, Theodore Ts'o wrote:
> On Wed, Oct 07, 2009 at 03:38:18PM +0800, Wu Fengguang wrote:
> > 
> > The estimated writeback bandwidth is about 1/2 the real throughput
> > for ext2/3/4 and btrfs; noticeable bigger than real throughput for NFS; and
> > cannot be estimated at all for XFS.  Very interesting..
> 
> Can you expand on what you mean here?  Estimated write bandwidth of
> what?  And what are you comparing it against?
 
Please refer to [PATCH 21/45] writeback: estimate bdi write bandwidth
and patch 22, I have some numbers there :)

> I'm having trouble understanding your note (which I'm guessing you
> write fairly late at night?  :-)

Sorry - I wrote that when I got tired on debugging ;)

Thanks,
Fengguang

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