linux-ext4 - Re: [RFC] ext4: Don't send extra barrier during fsync if there are no dirty pages.

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Date:	Tue, 3 Aug 2010 05:01:52 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Jan Kara <jack@...e.cz>, tytso@....edu,
	Ric Wheeler <rwheeler@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Mingming Cao <cmm@...ibm.com>,
	linux-ext4 <linux-ext4@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Keith Mannthey <kmannth@...ibm.com>,
	Mingming Cao <mcao@...ibm.com>
Subject: Re: [RFC] ext4: Don't send extra barrier during fsync if there are
 no dirty pages.

On Mon, Aug 02, 2010 at 05:09:39PM -0700, Darrick J. Wong wrote:
> Well... on my fsync-happy workloads, this seems to cut the barrier count down
> by about 20%, and speeds it up by about 20%.

Care to share the test case for this?  I'd be especially interesting on
how it behaves with non-draining barriers / cache flushes in fsync.

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