smp guest questions

[Michael Tokarev <mjt@tls.msk.ru>]

After seeing words from Avi about that smp guests
are ok now, I descided to try.  And immediately
got a few questions.

Running on a Phenom 9750 machine (PhenomI), AMD780G
chipset.  Host is 2.6.29 x86-64, qemu-kvm 0.10.5,
guests are linux with kvm paravirt bits enabled, also
dynticks (on both host and guest).


When booting a 2-CPU guest, I see in dmesg:

PM-Timer running at invalid rate: 200% of normal - aborting.

and indeed, in available_clocksource there's no pmtimer.
Should I be concerned?  It does not look healthy.


Some time later, I see stuff like:

hrtimer: interrupt too slow, forcing clock min delta to 47210997 ns

Which reminds me issues I had with broken hpet (time goes
back-n-forth with similar messages shown in dmesg, but
about hpet not hrtimer).  Also does not look healthy.


I haven't seen either of the two messages above on any of
single-processor guests so far, at least with recent kernels
and kvm userspace, only on smp (2 cpu for now).

Thanks!

/mjt