Centos on hyper-v, cpu utilization in virtual machines

I have a vm (linux centos) running on hyper-v (Version: 6.3.9600.16384) on windows server 2012 R2. It is running on a PC with a core-i5-3750.

I am trying to utilize maximum from physical cpu in my linux vm. I have a process (4 parallel) in the linux utilizing all 4 cores to 100%:

I have configured the vm to reserve 80% of the cpu (from all 4 cores) and the limit is 100%, however, the cpu usage in task manager in windows server is pretty minimal:

My question is: Is what I see in the task manager on win server the actual physical usage of the cpu or the reserved cpu by vm is disregarded by the task manager when hyper-v reserves it for the vm. If not, then what can I do to force the hyper-v to give maximum possible processing power to my vm.

Thanks

MD