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

[Thomas Gleixner]

On Thu, 27 Oct 2016, Ville Syrjälä wrote:
> On Thu, Oct 27, 2016 at 08:48:57PM +0200, Thomas Gleixner wrote:
> > What that old patch did, was:
> > 
> > 1) Make sure that the broadcast device is actually armed at resume.
> > 
> >    That might cause the HPET to resume proper.
> > 
> > 2) Force a max. 3 seconds rearm when the targeted expiry time is > than 10
> >    seconds
> > 
> >    That might make sure that lower C-States are never entered.
> 
> Doh. I lost the other hunk somewhere. Let's try that again... And indeed
> with the other hunk in tow the machine would appear to resume properly.

So it would be interesting whether that hunk in resume_broadcast() is
sufficient.
 
> > What's the lowest C-State with acpi-idle and what's the lowest one with
> > intel_idle?
> 
> acpi_idle
> /sys/devices/system/cpu/cpu0/cpuidle/state3/desc:ACPI FFH INTEL MWAIT 0x30
> /sys/devices/system/cpu/cpu0/cpuidle/state3/disable:0
> /sys/devices/system/cpu/cpu0/cpuidle/state3/latency:100
> /sys/devices/system/cpu/cpu0/cpuidle/state3/name:C3
> /sys/devices/system/cpu/cpu0/cpuidle/state3/power:0
> /sys/devices/system/cpu/cpu0/cpuidle/state3/residency:200
> /sys/devices/system/cpu/cpu0/cpuidle/state3/time:5677316
> /sys/devices/system/cpu/cpu0/cpuidle/state3/usage:5920
> 
> intel_idle:
> /sys/devices/system/cpu/cpu0/cpuidle/state3/desc:MWAIT 0x30
> /sys/devices/system/cpu/cpu0/cpuidle/state3/disable:0
> /sys/devices/system/cpu/cpu0/cpuidle/state3/latency:100
> /sys/devices/system/cpu/cpu0/cpuidle/state3/name:C4-ATM
> /sys/devices/system/cpu/cpu0/cpuidle/state3/power:0
> /sys/devices/system/cpu/cpu0/cpuidle/state3/residency:400
> /sys/devices/system/cpu/cpu0/cpuidle/state3/time:7146705
> /sys/devices/system/cpu/cpu0/cpuidle/state3/usage:6826

Does the machine work, when you limit intel idle to C3, which would then
match acpi idle ?

Thanks,

	tglx