I'm having exactly the same problem on a Dell Dimension C521, containing
an nForce 4 motherboard and an AMD64 X² processor with (k)qemu (compiled
from source) and KVM (0.16 through 0.18). The kernel log is flooded with
'rtc: lost some interrupts at 1024Hz' messages, quickly filling up the
/var partition. Moreover, KVM is not really stable on this machine.
However, when not using qemu or KVM, the machine is solid as a rock, and
no messages about lost interruptes are reported.

I'm not sure this is related, but on boot, I also get this warning from
the kernel:

[   14.506009] ..MP-BIOS bug: 8254 timer not connected to IO-APIC
[   14.686363] Using local APIC timer interrupts.
[   14.731677] result 12526120
[   14.731679] Detected 12.526 MHz APIC timer.


When looking in this machine's BIOS (this being a Dell of course), there is no 
option to influence the timer source (disable/enable HPET).

Googling on 'rtc: lost some interrupts at 1024Hz' reveals that it's
quite a common problem.

-- 
When using kqemu, rtc: lost some interrupts at 1024Hz.
https://bugs.launchpad.net/bugs/82149
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Bugs, which is the bug contact for Ubuntu.

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