Traffic on multiple vCPUs

Hi all,
I am running some performance tests regarding dVMQ. I want to run ntttcp
traffic(TCP) on all/some virtual cpus of a virtual machine. Even though i
use different cpu values(inside vm) for -m parameter like “-m 4,0”(VCPU0)
and “-m 4 1”(VCPU1), i always see VCPU0 getting used highly in task
manager. How to make sure this?