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

From	Feng Tang <feng.tang@intel.com>
Newsgroups	linux.kernel
Subject	Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online calls to hotplugged cpu")]
Date	2016-11-09 04:50 +0100
Message-ID	<sBs3D-1TF-3@gated-at.bofh.it> (permalink)
References	(5 earlier) <swZCW-6JC-11@gated-at.bofh.it> <swZMC-6Nm-69@gated-at.bofh.it> <sxhJv-1LS-25@gated-at.bofh.it> <sxkHn-3Tx-15@gated-at.bofh.it> <syOal-57X-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Nov 02, 2016 at 04:47:37AM +0800, Ville Syrjälä wrote:
> On Fri, Oct 28, 2016 at 08:58:41PM +0200, Thomas Gleixner wrote:
> > On Fri, 28 Oct 2016, Ville Syrjälä wrote:
> > > On Thu, Oct 27, 2016 at 10:41:18PM +0200, Thomas Gleixner wrote:
> > > > On Thu, 27 Oct 2016, Ville Syrjälä wrote:
> > > > > On Thu, Oct 27, 2016 at 09:25:05PM +0200, Thomas Gleixner wrote:
> > > > > > So it would be interesting whether that hunk in resume_broadcast() is
> > > > > > sufficient.
> > > > > 
> > > > > So far it looks like the answer is yes.
> > > > > 
> > > > > Looks to be about 5 seconds slower than acpi-idle in resuming, but
> > > > > I suppose that's not all that surprising ;)
> > > > 
> > > > Well, set it to 1msec then. If that works reliably then we really can do
> > > > that unconditionally. There is no harm in firing a useless timer during
> > > > resume once.
> > > 
> > > I narrowed down the required timeout, and looks like 25ms is the
> > > minimum that works. With 24ms I already started to have failures. So
> > > maybe just bump it up by an order of magnitude to 250ms for some
> > > safety margin?
> 
> 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. 

Thanks,
Feng

Thread

Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-10-27 19:30 +0200
  Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Thomas Gleixner <tglx@linutronix.de> - 2016-10-27 21:00 +0200
    Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Thomas Gleixner <tglx@linutronix.de> - 2016-10-27 21:30 +0200
      Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-10-27 22:40 +0200
        Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Thomas Gleixner <tglx@linutronix.de> - 2016-10-27 22:50 +0200
          Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-10-28 18:00 +0200
            Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Thomas Gleixner <tglx@linutronix.de> - 2016-10-28 21:10 +0200
              Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-11-01 21:50 +0100
                Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-11-07 13:00 +0100
                Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Thomas Gleixner <tglx@linutronix.de> - 2016-11-07 14:20 +0100
                Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-11-07 17:50 +0100
                Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Feng Tang <feng.tang@intel.com> - 2016-11-09 04:50 +0100
                Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-09 07:10 +0100
    Re: S3 resume regression [1cf4f629d9d2 ("cpu/hotplug: Move online  calls to hotplugged cpu")] Ville Syrjälä <ville.syrjala@linux.intel.com> - 2016-10-27 21:30 +0200

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