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Re: [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot optio
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part) |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Tue, 06 Oct 2009 10:09:51 +0100 |
| Cc: | "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 06 Oct 2009 02:10:17 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part) |
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On 06/10/2009 08:07, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: >> Perhaps a better choice would be for emulated tsc >> to return Xen system time in both kernel and user >> mode (which is what it does for HVM domains) and, >> when a domain has tsc_native==0, >> Xen sets its pvclock parameters so that no scaling >> occurs? This results in the guest reporting that >> it has a 1GHz clock, but may be more consistent. > > Yes, this has to be fixed. There's no good reason for different TSC > behaviours between kernel and userspace when both are emulated. If nothing > else, when Jeremy's patches go in (which I am sure they will, as the concept > is sane and the implementation appears so too) then that is going to be > incompatible with emulated tsc as it behaves currently. Should be fixed by c/s 20271. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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