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Re: [Xen-users] Xen support for emulating TSC register!!

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "techy geek" <techygeek72@xxxxxxxxx>
  • Date: Mon, 5 Nov 2007 03:14:26 -0500
  • Delivery-date: Mon, 05 Nov 2007 00:15:14 -0800
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 Can Anyone let me know how to enable/disbale the TSC Emulation register on Xen Guest (XenU)???

Suppose I wanna use the apparent time of Host OS instead of using emulated TSC register, how can I configure to use it??


On 11/2/07, Tom Horsley <tom.horsley@xxxxxxx> wrote:
On Fri, 2 Nov 2007 16:19:29 -0400
"techy geek" <techygeek72@xxxxxxxxx> wrote:

> Hi Everyone,
> I need to do  some profiling on Xen Virtual machine.  I have a query here:
> * Like VMWare, Can Xen Guest emulates the TSC  CPU register??? if Yes, then
> how is the performance of this TSC register as I read that VmWare  very
> poorly emulates the TSC register.

I suspect "poor" describes Xen as well. I keep seeing messages on the
console of various HVM's I have which say something about unstable TSC
values off by some 6 or 7 digit number of cycles.

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