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

[Darrick J. Wong]

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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