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

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

    --
    Ville Syrjälä
    Intel OTC

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