[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] CR4.TSD in guest kernel vs userland
It's only likely to be reasonable for PV 64-bit guests, which transition via the hypervisor already for guest-kernel <-> guest-app transitions (i.e., those transition times suck already). -- Keir On 21/09/2009 23:49, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: > I was fretting about the overhead of emulating TSC in > guest kernels. Is it possible (and relatively inexpensive) > to change CR4.TSD on every transition between guest > kernel and userland? I suspect not, but thought > I'd check. If so, what about HVM vs PV and 32-bit > vs 64-bit guest. > > Thanks, > Dan > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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