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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 8 Nov 2016 22:08:37 -0800
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Subject: Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online
 calls to hotplugged cpu")]
To: Feng Tang <feng.tang@intel.com>
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On Tue, Nov 8, 2016 at 7:54 PM, Feng Tang <feng.tang@intel.com> 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?

              Linus