Re: Weird clock behaviour with current (amd64) kernel

[mlelstv%serpens.de@localhost (Michael van Elst)]

kre%munnari.OZ.AU@localhost (Robert Elz) writes:

>Pity this won't help with PR 43997 - but I conclude from your response about
>that, that if the host running qemu had HZ set significantly higher than 100
>then qemu (hosting a kernel with HZ==100) would probably work just fine?

Yes.

FreeBSD has the following comment (in sys/conf/NOTES):

# The granularity of operation is controlled by the kernel option HZ (default
# frequency of 1000 Hz or a period 1ms between calls). Virtual machine guests
# use a value of 100.

N.B. It would be nice if there were a (MI) boot option that could be used
to influence HZ without recompiling. Booting into ddb and patching hz
and a few derived variables isn't that comfortable.