> I'm able to see these glitches, as said the VM doesn't really hang, it
> just gets stuck for a long time (and I think that depends on the
> uptime differences between the source and destination hosts). In the
> meantime, could you please test if changing the timecounter from
> XENTIMER to any other (like HPET or
> ACPI-fast) solves the issue?
> # sysctl -w kern.timecounter.hardware=ACPI-fast
I changed the timecounter from XENTIMER to ACPI-fast and then I did about 10
migrations between our 3 hosts. I always started the next migration a few
seconds after the previous migration finished. The VM didn't stuck now and I
didn't see the VGABios screen on the console.
I can also add to this... changing timecounter to ACPI-fast definitely fixes
the problem. I can migrate a handful of freebsd11 vm's back and forth and
all stay running correctly.
So... bug in XENTIMER?
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