Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]

[Ville Syrjälä]

On Tue, Nov 08, 2016 at 10:08:37PM -0800, Linus Torvalds wrote:
> On Tue, Nov 8, 2016 at 7:54 PM, Feng Tang <feng.tang@xxxxxxxxx> wrote:
> > On Wed, Nov 02, 2016 at 04:47:37AM +0800, Ville Syrjälä wrote:
> >>
> >> I left the thing running for the weekend and it failed 26 out of 16057
> >> times with the 25ms timeout. Looks like it takes ~5 minutes to resume
> >> when it fails, but eventually it does come back.
> >
> > Just came back from a travel. Yes, the 5 minutes delay may be due to the
> > expiration of the HPET timer, counting from 0 to 0xffffffff for a 13M
> > frequencey HPET takes about 300 seconds. After resume, it seems nobody
> > arms it so my old patch forces to arm one event.
> 
> Ville, what happens if you disable HPET? Can you force the TSC with
> "clocksource=tsc" or "tsc=reliable". Does resume work reliably then?
> 
> Or is this one of the CPU's where tsc just doesn't work?

tsc=reliable allows use of the tsc it seems. Doesn't seem to help
with resuming though.

-- 
Ville Syrjälä
Intel OTC