Messages in this thread | | | Date | Wed, 20 May 2015 13:21:10 +0200 | From | Borislav Petkov <> | Subject | Re: [RFC PATCH 2/4] x86, mwaitt: introduce mwaitx idle with a configurable timer |
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On Wed, May 20, 2015 at 01:11:20PM +0200, Ingo Molnar wrote: > - MWAITX takes a 'timeout' parameter, but otherwise behaves exactly > like MWAIT: i.e. once idle it won't exit idle on its own
Let me quote the commit message:
"MWAITT, another name is MWAITX (MWAIT with extensions), has a configurable timer that causes MWAITX to exit on expiration."
You need to set the second bit in ECX to enable the timer.
I guess if you don't, then you get normal MWAIT but then you don't need the timeout either...
> - based on the 'timeout' hint, MWAITX can internally optimize how > deep sleep it enters. If the timeout is large it goes deep, if > it's small, it goes shallow.
I haven't heard anything about handling the timeout this way and if it is not done this way, maybe Rui could forward this idea to hw people...
> If it's a true timeout, as you suggest, then I don't see any obvious > way to support it, especially if it does not give access to deeper > sleep states.
Right.
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
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