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

[Christoph Hellwig]

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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