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Re: [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot optio
| To: | Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] replace rdtsc emulation-vs-native xen boot option with per-domain (hypervisor part) |
| From: | Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
| Date: | Mon, 28 Sep 2009 16:10:05 -0700 |
| Cc: | "Xen-Devel \(E-mail\)" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Delivery-date: | Mon, 28 Sep 2009 16:10:31 -0700 |
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On 09/28/09 15:43, Dan Magenheimer wrote:
> PV ones too. An app doesn't have any idea (and doesn't
> and shouldn't care) if it is running on a PV or HVM domain.
>
Well, it shouldn't be enabled by default. That slows down all rdtsc
operations for the benefit of very niche applications. The Xen
clocksource assumes that rdtsc is fast, unemulated and in need of
correction.
If someone really needs an artificial tsc, then they can enable the
option for themselves.
J
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