linux-kernel - Re: [PATCH 00/26] AIO performance improvements/cleanups, v2

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Date:	Fri, 14 Dec 2012 10:26:09 +0800
From:	Jack Wang <jack.wang.usish@...il.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Kent Overstreet <koverstreet@...gle.com>,
	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, zab@...hat.com, bcrl@...ck.org,
	jmoyer@...hat.com, viro@...iv.linux.org.uk
Subject: Re: [PATCH 00/26] AIO performance improvements/cleanups, v2

2012/12/14 Jens Axboe <jaxboe@...ionio.com>:
> On Mon, Dec 03 2012, Kent Overstreet wrote:
>> Last posting: http://thread.gmane.org/gmane.linux.kernel.aio.general/3169
>>
>> Changes since the last posting should all be noted in the individual
>> patch descriptions.
>>
>>  * Zach pointed out the aio_read_evt() patch was calling functions that
>>    could sleep in TASK_INTERRUPTIBLE state, that patch is rewritten.
>>  * Ben pointed out some synchronize_rcu() usage was problematic,
>>    converted it to call_rcu()
>>  * The flush_dcache_page() patch is new
>>  * Changed the "use cancellation list lazily" patch so as to remove
>>    ki_flags from struct kiocb.
>
> Kent, I ran a few tests, and the below patches still don't seem as fast
> as the approach I took. To keep it fair, I used your aio branch and
> applied by dio speedups too. As a sanity check, I ran with your branch
> alone as well. The quick results below - kaio is kent-aio, just your
> branch. kaio-dio is with the direct IO speedups too. jaio is my branch,
> which already has the dio changes too.
>
> Devices         Branch          IOPS
> 1               kaio            ~915K
> 1               kaio-dio        ~930K
> 1               jaio           ~1220K
> 6               kaio           ~3050K
> 6               kaio-dio       ~3080K
> 6               jaio            3500K
>
> The box runs out of CPU driving power, which is why it doesn't scale
> linearly, otherwise I know that jaio at least does. It's basically
> completion limited for the 6 device test at the moment.
>
> I'll run some profiling tomorrow morning and get you some better
> results. Just thought I'd share these at least.
>
> --
> Jens Axboe
>

A really good performance, woo.

I think the device tested is really fast PCIe SSD builded by fusionio
with fusionio in house block driver?

any compare number with current mainline?

Jack
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