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Re: [Xen-devel] CR4.TSD in guest kernel vs userland
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] CR4.TSD in guest kernel vs userland |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 22 Sep 2009 07:34:10 +0100 |
| Cc: | Jan Beulich <JBeulich@xxxxxxxxxx> |
| Delivery-date: | Mon, 21 Sep 2009 23:35:04 -0700 |
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| Thread-topic: | [Xen-devel] CR4.TSD in guest kernel vs userland |
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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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