Hi all, I am trying to run some performance tests using libvirt 1.2.17. For these tests it is necessary to set a specific affinity for the VCPUs of a running VM. The problem is, that I noticed a significant performance drop in my metrics when using ‘vcpupin’ from the virsh console instead of running ‘taskset’ natively. Specifically the methods I am comparing are 1. Using native shell taskset –a –cp $MY_CPUSET $MY_DOMAIN_PID 2. Using virsh console (performance ~30% down) for all $VCPUs virsh vcpupin my_domain –cpulist $MY_CPUSET –vcpu $VCPU –live virsh emulatorpin my_domain –cpulist $MY_CPUSET –live It seems that the usage of ‘vcpupin’ causes a performance drop even if it is run alongside ‘taskset’ on the same $CPU_SET Functionally everything seems to be working when I check the ‘/proc/’ filesystem cat /proc/MY_DOMAIN_PID/*/status | grep Cpus_allowed_list My questions are: 1. Has anybody else noticed this? 2. Is this expected based on the implementation details? 3. Is this a bug that is fixed in a newer libvirt version? 4. Is there a solution to this issue? Thanks,
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