On Wed, 2017-04-26 at 14:30 +0200, Mike Galbraith wrote:
> On Wed, 2017-04-26 at 13:39 +0200, Mike Galbraith wrote:
> > On Wed, 2017-04-26 at 12:26 +0200, Peter Zijlstra wrote:
> > > On Wed, Apr 26, 2017 at 10:57:42AM +0200, Mike Galbraith wrote:
> > >
> > > > Both still lose their TSC.
> > > >
> > > > [ 11.982468] tsc: Refined TSC clocksource calibration: 2260.999 MHz
> > > > [ 11.994275] clocksource: tsc: mask: 0xffffffffffffffff max_cycles:
> > > > 0x20974a4d8bb, max_idle_ns: 440795246623 ns
> > > > [ 13.064172] clocksource: Switched to clocksource tsc
> > > > [ 240.247851] clocksource: timekeeping watchdog on CPU23: Marking
> > > > clocksource 'tsc' as unstable because the skew is too large:
> > > > [ 240.462501] clocksource: 'tsc' cs_now:
> > > > 108fe5be09f cs_last: b90a6a0676 mask: ffffffffffffffff
> > > > [ 240.675057] tsc: Marking TSC unstable due to clocksource watchdog
> > >
> > >
> > > And they didn't use to? We don't typically write to TSC or TSC_ADJUST
> > > and thus would not cause such behaviour.
> >
> > Nope.
>
> DL980 seems perfectly happy with master.today.. so off we go.
hm, this bit of huge trace looks less than wonderful.
<idle>-0 [041] ..s2 317.304657: timer_expire_entry:
timer=ffffffff820d6600 function=clocksource_watchdog now=4294971392
<idle>-0 [041] d.s4 317.304660: timer_start:
timer=ffffffff820d6600 function=clocksource_watchdog expires=4294916631
[timeout=-54761] cpu=42 idx=19 flags=
<idle>-0 [041] ..s2 317.304660: timer_expire_exit:
timer=ffffffff820d6600
^^^^^^^^^^^^^^
1.1 megalines later, we finally meet function=clocksource_watchdog
again, and have a cow.
<idle>-0 [043] d.s3 489.511620: timer_cancel:
timer=ffffffff820d6600
<idle>-0 [043] ..s2 489.511621: timer_expire_entry:
timer=ffffffff820d6600 function=clocksource_watchdog now=4295014443
<idle>-0 [043] ..s2 489.511628: clocksource_watchdog:
timekeeping watchdog on CPU43: Marking clocksource 'tsc' as unstable because
the skew is too large:
<idle>-0 [043] ..s2 489.511630: clocksource_watchdog:
'hpet' wd_now: a1cbfa1a wd_last: ed7acfe mask: ffffffff
<idle>-0 [043] ..s2 489.511630: clocksource_watchdog:
'tsc' cs_now: 1c24ee60f22 cs_last: 167a92e836f mask:
ffffffffffffffff
