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xen-devel
RE: [Xen-devel] How expensive is a VM EXIT?
Is there a good tool to look at for this -- xentrace, xenoprofile, other?
Thanks,
Ed
-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Keir Fraser
Sent: Wednesday, March 04, 2009 1:46 AM
To: NAHieu
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] How expensive is a VM EXIT?
On 04/03/2009 00:15, "NAHieu" <nahieu@xxxxxxxxx> wrote:
> On Wed, Mar 4, 2009 at 1:34 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
>> For just the VMEXIT itself, it's probably about 1000-1500 cycles on the
>> latest processors. I haven't measured it very recently though.
>>
>
> Could you explain how do you measure the cycles for VMEXIT?
RDTSC in the guest immediately before triggering a VMEXIT and RDTSC in the
hypervisor on entry.
-- Keir
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