On Tue, 18 Sep 2018, Thomas Gleixner wrote:
> On Tue, 18 Sep 2018, Peter Zijlstra wrote:
> > > Your memory serves you right. That's indeed observable on CPUs which
> > > lack TSC_ADJUST.
> >
> > But, if the gtod code can observe this, then why doesn't the code that
> > checks the sync?
>
> Because it depends where the involved CPUs are in the topology. The sync
> code might just run on the same package an simply not see it. Yes, w/o
> TSC_ADJUST the TSC sync code can just fail to see the havoc.
Even with TSC adjust the TSC can be slightly off by design on multi-socket
systems.
Thanks,
tglx
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