[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-ia64-devel] SMP guest and itc
Le Vendredi 10 Février 2006 19:15, Magenheimer, Dan (HP Labs Fort Collins) a écrit : > Just to briefly reiterate my opinion on the general > timer tick issue: The vast majority of timer ticks > get immediately reflected to the currently executing > domain. Since ticks are very frequent (though recently > reduced in Linux/ia64 from 1024/sec to 250/sec), there > needs to be a "fast path" that can easily determine > if this is a "immediately reflect" tick or not. It > shouldn't be necessary to go through all the save/restore > overhead to call C and then march down linked > lists only to determine that this is indeed one of the > 99% of ticks that should be immediately reflected. From a performance POV, I agree with you. But this is an orthogonal issue! > That said, I agree that Xen needs to pre-synchronize ITC > for host SMP to work properly. I don't think guest SMP > for Linux will force ITC to be paravirtualized, but > I guess Tristan will let us know if he discovers otherwise. Currently this is my option: Xen pre-synchronize ITC and no more ITC virtualization is performed. Tristan. _______________________________________________ Xen-ia64-devel mailing list Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-ia64-devel
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