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Date:	Tue, 27 Oct 2009 12:16:22 -0400
From:	Jeff Moyer <>
To:	Jens Axboe <>
Cc:, linux-aio <>,
	Linux Kernel Mailing <>,
	Andrew Morton <>
Subject: Re: [patch v4 0/3] aio: implement request batching [more performance numbers]

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

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