[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Time went backwards
On Fri, 10 Mar 2006, Keir Fraser wrote: > On 10 Mar 2006, at 17:00, Rik van Riel wrote: > > > I am very frequently seeing these Time went backwards messages > > on my test systems. Running a 2 VCPU guest on a single CPU > > computer seems to be effective at triggering this ;) > > That's interesting, particularly if you can trigger on a single physical > CPU. In that case cpu_delta should definitely *never* be negative. Maybe > the steal_time logic, which does mess with per-cpu > processed_system_time, is not quite right? :-) My current suspicion is that the per-cpu processed_system_time gets incremented twice during one timer irq handling, and then we notice it was incremented too far during the _next_ timer interrupt. > When did you start seeing the messages? They became frequent after the new steal time code went in. -- All Rights Reversed _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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