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    SubjectRe: Async suspend-resume patch w/ completions (was: Re: Async suspend-resume patch w/ rwsems)
    On Sun, 20 Dec 2009, Rafael J. Wysocki wrote:

    > > It's too early to come to this sort of conclusion (i.e., that suspend
    > > and resume react very differently to an asynchronous approach). Unless
    > > you have some definite _reason_ for thinking that resume will benefit
    > > more than suspend, you shouldn't try to generalize so much from tests
    > > on only two systems.
    >
    > In fact I have one reason. Namely, the things that drivers do on suspend and
    > resume are evidently quite different and on these two systems I was able to
    > test they apparently took different amounts of time to complete.
    >
    > The very fact that on both systems resume is substantially longer than suspend,
    > even if all devices are suspended and resumed synchronously, is quite
    > interesting.

    Yes, it is. But it doesn't mean that suspend won't benefit from
    asynchronicity; it just means that the benefits might not be as large
    as they are for resume.

    Alan Stern



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