[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] rdtscP and xen (and maybe the app-tsc answer I've been looking for)
On 21/09/2009 16:25, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: > OK, I think I see the problem. > > Since cs19506 "consistent_tscs" is a Xen boot parameter that > defaults to disabled. If the boot parameter is enabled and > the boot cpu does NOT have X86_FEATURE_CONSTANT_TSC set, > consistent_tscs gets re-disabled. > > For my pvrdtscp scheme to work, consistent_tscs would need to > be changed so that it defaults to enabled. > > Jan, could you confirm that this solves the problem on your > constant-TSC AMD box? > > Keir, is there any reason that consistent_tscs shouldn't > default to enabled? There was some question whether it means what you think it means across NUMA nodes. If we are sure that it does guarantee consistency across NUMA nodes -- or if we don't care about that -- then it can be enabled by default. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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