Mark McLoughlin wrote:
On Fri, 2009-02-06 at 18:55 +0900, John Summerfield wrote:
Mark McLoughlin wrote:
Try booting the guest with clocksource=acpi_pm on the kernel command
line. If that helps, it's this bug:
https://bugzilla.redhat.com/475598
It's an issue with KVM's paravirt clock. We have a workaround in the
rawhide host kernel which disables kvmclock support on affected hosts. A
real fix is in progress upstream.
The F-10 branch has the workaround, but only for the 2.6.29 builds. I
don't think we have it in the 2.6.27 updates (i.e. the
private-fedora-10-2_6_27 branch).
Chuck, could we get linux-2.6-kvmclock-unsync-tsc-workaround.patch
pulled into F-10?
I'm fully virtualised. I think. What's this about a paravirt clock in KVM?
KVM uses hardware virtualization support to run guests, yes, but it also
allows guests to use paravirtualization for some performance critical
operations - so e.g. pv block/network drivers, pv clock and pv MMU.
My debian guest uses tsc for its clock source (I just looked under sys,
having read that bug report and got a clue). It has none of the pv stuff.
I've also had problems installing CentOS 5.x guests, I don't think I've
managed it yet.
I didn't report it because I don't like "it doesn't work" reports, and
really I had no more than that.
I would feel more confident with that patch in, I'm not sure I want to
go through another rawhide/alpha experience.
The host CPU is Intel E6300 dual core, and I'm running 64-bit host, and
I do have frequency scaling.
--
Cheers
John
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