On 06/11/2010 07:22 AM, Chris Adams wrote:
I am running a KVM guest (managed with libvirt) on RHEL 5.5 (both host
and guest). I am seeing a significant clock skew in the guest, and I
have been unable to correct it. I have found several suggested
solutions, including adding "notsc divider=10" (from a BZ about clock
skew), but nothing seems to really help. Does anybody have any
suggestions?
I had problems with Xen and clock skew as well. Is this just a problem
with virtualization? How is this "ready for prime time" when the time
of day clock is so wrong?
I don't have a solution for your specific problem but if you're
interested in knowing why time drift is so prolific in virtualized
environments vmware have an excellent paper on the topic.
http://www.vmware.com/pdf/vmware_timekeeping.pdf
As a consequence you may want to try the following boot time kernel
arguments on the guest to see if they help:
noapic nolapic nosmp divider=10 nolapic_timer
"nosmp" has helped me in the past on other hypervisors.
--
Tim
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