Messages in this thread | | | Subject | Re: x86, vmi: TSC going backwards check in vmi clocksource | From | Alok Kataria <> | Date | Thu, 19 Feb 2009 10:03:58 -0800 |
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On Thu, 2009-02-19 at 03:18 -0800, Ingo Molnar wrote: > * Alok Kataria <akataria@vmware.com> wrote: > > > From: Alok N Kataria <akataria@vmware.com> > > > > Similar to the check for TSC going backwards in the TSC > > clocksource, we also need this check for VMI clocksource. > > ok. Precisely what kind of bug/symptoms does this fix?
If the read CYCLES_REAL counter value is less than the cycle_last value, it may result in time jumps. I also saw some messages about process being stuck for more than 120sec, which was traced back to this.
Thanks, Alok > > Ingo
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