[Devel] Re: [RFC] IO scheduler based io controller (V5)

[Jeff Moyer]

Vivek Goyal <vgoyal at redhat.com> writes:

> On Sun, Jun 21, 2009 at 08:51:16PM +0530, Balbir Singh wrote:
>> * Vivek Goyal <vgoyal at redhat.com> [2009-06-19 16:37:18]:
>> 
>> > 
>> > Hi All,
>> > 
>> > Here is the V5 of the IO controller patches generated on top of 2.6.30.
>> [snip]
>> 
>> > Testing
>> > =======
>> >
>> 
>> [snip]
>> 
>> I've not been reading through the discussions in complete detail, but
>> I see no reference to async reads or aio. In the case of aio, aio
>> presumes the context of the user space process. Could you elaborate on
>> any testing you've done with these cases? 
>> 
>
> Hi Balbir,
>
> So far I had not done any testing with AIO. I have done some just now.
> Here are the results.
>
> Test1 (AIO reads)
> ================
> Set up two fio, AIO read jobs in two cgroup with weight 1000 and 500
> respectively. I am using cfq scheduler. Following are some lines from my test
> script.
>
> ===================================================================
> fio_args="--ioengine=libaio --rw=read --size=512M"

AIO doesn't make sense without O_DIRECT.

Cheers,
Jeff
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