linux-kernel - Re: [PATCH v1 0/9] block & aio: kernel aio and loop mq conversion

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Date:	Fri, 15 Aug 2014 06:11:37 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Zach Brown <zab@...bo.net>, Benjamin LaHaise <bcrl@...ck.org>,
	Christoph Hellwig <hch@...radead.org>,
	Kent Overstreet <kmo@...erainc.com>,
	"open list:AIO" <linux-aio@...ck.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Dave Chinner <david@...morbit.com>
Subject: Re: [PATCH v1 0/9] block & aio: kernel aio and loop mq conversion

On Fri, Aug 15, 2014 at 08:59:56PM +0800, Ming Lei wrote:
> Your concern is right, previous I thought that mq conversion wouldn't improve
> throughput, but I did ignore workqueue's concurrency management, it
> turns out blk-mq conversion can improvment throughput close to 10 times in
> my test(loop over virtio-blk which is backed by one image on SSD).  It is like
> POSIX style AIO after mq conversion thanks to workqueue, and I need to
> update the performance data in V2.
> 
> Actually kernel AIO needn't such high concurrency.

Can you juse send a loop blk-mq conversion for now?  I think that's
a bit less controversial than the new kernel aio APIs, and keeping the
two separate is a good idea in general.

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