Hi,
We know that there is a command "setvcpus" in virsh used to "change
number of virtual CPUs", now we just have the need to change vcpu count
dynamically for a running VM, so I tried this command (the vcpu count is
2 in the VM xml file), below is the result:
virsh # setvcpus 3 --count 4
error: invalid argument: requested vcpus is greater than max allowable
vcpus for the domain: 4 > 2
virsh # setvcpus 3 --count 1
error: Operation not supported: qemu didn't unplug the vCPUs properly
So I tried another way: log into the running VM, and "echo 0 >
/sys/devices/system/cpu/cpu1/online", after that I can find only one
processor in the vm through '/proc/cpuinfo', but in virsh, the vcpuinfo
still shows:
virsh # vcpuinfo 3
VCPU: 0
CPU: 0
State: running
CPU time: 13.5s
CPU Affinity: yyyy
VCPU: 1
CPU: 1
State: running
CPU time: 6.9s
CPU Affinity: yyyy
So the question is: is there any method I can't find yet to change the
vcpu count of a running vm dynamically?
BRs,
Dennis
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