linux-kernel - Re: [PATCH v2 0/4] block & aio: improve loop with kernel aio

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Message-ID: <20150113162307.GA21338@infradead.org>
Date:	Tue, 13 Jan 2015 08:23:07 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	Jens Axboe <axboe@...nel.dk>, Zach Brown <zab@...bo.net>,
	Christoph Hellwig <hch@...radead.org>,
	Maxim Patlasov <mpatlasov@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH v2 0/4] block & aio: improve loop with kernel aio

On Tue, Jan 13, 2015 at 11:44:44PM +0800, Ming Lei wrote:
> Follows benefits from using kernel aio in loop:
> 	- avoid double cache, and memory usage decreased a lot
> 	- system load gets much decreased

This seems to conflate two changes:

 1) use direct I/O
 2) use aio (require 1)

what numbers do you get when just using direct I/O?
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