On 10/6/20 7:56 pm, Patrick O'Callaghan wrote:
On Tue, 2020-06-09 at 16:52 -0700, Gordon Messmer wrote:
On 6/9/20 5:10 AM, Stephen Morris wrote:
I have the following messages in dmesg output, are they indicating a
cpu issue, or are they just indicating that because linux is running
in a vm under windows, and hence sharing the cpu cores with windows
that windows was using core 7 at the time the process checked?
Yes, probably something like that. Typically, in order to schedule a
virtual machine run time, all of the CPUs that the guest will use must
be free simultaneously. As you allot more CPUs to a virtual machine,
that becomes harder to schedule, and the guest can experience greater
latency between run time. If your host system doesn't have at least 12
CPU cores, I would recommend against allotting 8 to the guest. Fewer
cores will be easier to schedule, and may perform better.
In KVM/QEMU you can also pin specific cores to your VM to prevent
competition between the host and guest (mainly by avoiding cache
pollution as I understand it). I do this for Windows gaming under
Fedora, but I don't know if that's supported in VB on a Windows host.
I think virtualbox has the equivalent in that it has an execution cap to
limit the amount of physical cpu time the virtual cpu is allowed to use,
and by setting the percentage to 100% disables the cap, which I assume
means the vm will not release the cpu back to windows.
regards,
Steve
poc
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