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Date:	Wed, 28 Oct 2009 09:28:54 +0100
From:	Jens Axboe <>
To:	Jeff Moyer <>
Cc:, linux-aio <>,
	Linux Kernel Mailing <>,
	Andrew Morton <>
Subject: Re: [patch v4 0/3] aio: implement request batching [more
	performance numbers]

On Tue, Oct 27 2009, Jeff Moyer wrote:
> Jens Axboe <> writes:
> >> > Nice numbers! The patch looks good to me from a quick look, if you want
> >> > I can throw it into the testing mix tomorrow and see what kind of
> >> > improvements I see here. With performance increase of that magnitude, we
> >> > should get it in sooner rather than later.
> >> 
> > So here's a pretty basic test. It does random reads from a bunch of
> > devices, I tested both 4kb and 64kb block sizes. Queue depth used is 32
> > for both cases, but note that this test uses a thread per device (so the
> > queue depth is 32 per device). Results are averaged over 3 runs.
> > slat/clat are the submission and completion latencies, they are in
> > microseconds here.
> [...]
> > So pretty close, nothing earth shattering here. What the results above
> > do not show is that the 4kb test runs very stable with your patch.
> > Mainline fluctuates somewhat in the bandwidth, most likely due to the
> > varying depth.
> OK, I don't think this patch set will see further testing without
> pulling it into someone's tree.  Jens, would you mind putting this into
> your for-2.6.33 queue?  Let me know if you need me to resend the
> patches.

Sure, I'll pull it in. I still have the patches, will ping you if it
doesn't apply cleanly.

Jens Axboe

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