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    SubjectRe: [RFC] IO scheduler based io controller (V5)
    Date
    Vivek Goyal <vgoyal@redhat.com> writes:

    > On Sun, Jun 21, 2009 at 08:51:16PM +0530, Balbir Singh wrote:
    >> * Vivek Goyal <vgoyal@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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