rbraun at sceen.net
Tue Jul 21 15:08:44 UTC 2015
On Tue, Jul 21, 2015 at 04:24:07PM +0200, lst_hoe02 at 79365-rhs.de wrote:
> That's the problem, it is already difficult to get a precise time
> tick/measurement on bare hardware, but with a Hypervisor in between which is
> trying to isolate the hardware from the VMs running, it get worse in some
> cases because the VMs are not aware of the decisions a Hypervisor does to
> manage hardware/counter access. This is *never* a problem with "standard"
> use cases but it might get a problem with many VMs all trying to get
> reliable time ticks for example.
I agree, despite the excellent progress concerning timer implementations,
VMs still add some latency, which is usually non desterministic and
sometimes non negligible.
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