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 _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
