linux-ext4 - Re: [RFC v3] ext4: Combine barrier requests coming from fsync

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Message-ID: <20100816161433.GK2109@tux1.beaverton.ibm.com>
Date:	Mon, 16 Aug 2010 09:14:33 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Ted Ts'o" <tytso@....edu>, Mingming Cao <cmm@...ibm.com>,
	Ric Wheeler <rwheeler@...hat.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 v3] ext4: Combine barrier requests coming from fsync

On Mon, Aug 09, 2010 at 05:07:23PM -0400, Christoph Hellwig wrote:
> Can you try with the new barrier implementation in the
> 
> 	[PATCH, RFC] relaxed barriers
> 
> by making cache flushes just that and not complicated drain barrier
> it should speed this case up a lot.

Indeed it does!  The barrier count increases to about 21000, but I also see
much higher throughput, about 830 transactions per second (versus 12000 and 760
respectively before Tejun's patch).

--D
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