[ntp:questions] Time synchronization for hosts running on VMWare

Ryan Malayter malayter at gmail.com
Sun Jul 20 20:02:25 UTC 2008


On Sun, Jul 20, 2008 at 12:18 PM,  <brian.utterback at gmail.com> wrote:
> That doesn't seem right. Some forms of virtualization virtualize the
> time in this manner, but some do not. For instance on a multiple
> processor system, any type 1 hypervisor like xen or Hyper-X should be
> able to keep the  time just fine. With other types like VMware and
> Virtualbox that share the resources between the host OS and the
> virtual one, it only stands to reason that the time keeping will be
> shaky at best.

It seems Xen has the same issues as VMware... see:
http://xen.org/files/summit_3/Xen_HVM_SMP.pdf

Interrupts (including timer interrupts) are delayed, and/or batched
with all x86 virtualization platforms of which I'm aware.

-- 
RPM



More information about the questions mailing list