Messages in this thread | | | Date | Sun, 20 Dec 2009 12:12:09 -0500 (EST) | From | Alan Stern <> | Subject | Re: Async suspend-resume patch w/ completions (was: Re: Async suspend-resume patch w/ rwsems) |
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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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