On Wed, Dec 03, 2014 at 11:48:55AM -0800, Linus Torvalds wrote:
> On Wed, Dec 3, 2014 at 11:25 AM, Linus Torvalds
> <torva...@linux-foundation.org> wrote:
> >
> > I don't know. This piece of code:
> >
> > delta = clocksource_delta(wdnow, cs->wd_last, watchdog->mask);
> >
> > makes no sense to me.
>
> Yeah, no, I see what's up. I missed that whole wd_last vs cs_last
> pairing. I guess that part is all good. There are other crazy issues
> in there, though, like the double test of 'watchdog_reset_pending'. So
> I still wonder, though, since that odd 96-second delta is just insane
> and makes no sense from a TSC standpoint (it's closer to a 32-bit
> overflow of a hpet counter, but that sounds off too).
fwiw, there's quite a bit of variance in the delta that seems to show up.
Clocksource tsc unstable (delta = -1010986453 ns)
Clocksource tsc unstable (delta = -112130224777 ns)
Clocksource tsc unstable (delta = -154880389323 ns)
Clocksource tsc unstable (delta = -165033940543 ns)
Clocksource tsc unstable (delta = -16610147135 ns)
Clocksource tsc unstable (delta = -169783264218 ns)
Clocksource tsc unstable (delta = -183044061613 ns)
Clocksource tsc unstable (delta = -188697049603 ns)
Clocksource tsc unstable (delta = -190100649573 ns)
Clocksource tsc unstable (delta = -192732788150 ns)
Clocksource tsc unstable (delta = -211622574067 ns)
Clocksource tsc unstable (delta = -219378634234 ns)
Clocksource tsc unstable (delta = -226609871873 ns)
Clocksource tsc unstable (delta = -228355467642 ns)
Clocksource tsc unstable (delta = -233950238702 ns)
Clocksource tsc unstable (delta = -243666538341 ns)
Clocksource tsc unstable (delta = -251535074315 ns)
Clocksource tsc unstable (delta = -26880030622 ns)
Clocksource tsc unstable (delta = -37899993747 ns)
Clocksource tsc unstable (delta = -50471031780 ns)
Clocksource tsc unstable (delta = -6821168015 ns)
Clocksource tsc unstable (delta = -7067883139 ns)
Clocksource tsc unstable (delta = -76682050692 ns)
Clocksource tsc unstable (delta = -8296489689 ns)
Clocksource tsc unstable (delta = -88373866635 ns)
Clocksource tsc unstable (delta = -89099193219 ns)
Clocksource tsc unstable (delta = -95946009388 ns)
(sort -u'ed post grep, the ordering here doesn't mean anything)
Dave
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