Folks, We are running openstack with KVM and i have noticed kvm presenting wrong CPU Tolopoly to VM and because of that we are seeing bad performance to our application. This is openstack compute: # lstopo-no-graphics --no-io Machine (64GB total) NUMANode L#0 (P#0 32GB) + Package L#0 + L3 L#0 (25MB) L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 PU L#0 (P#0) PU L#1 (P#20) L2 L#1 (256KB) + L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 PU L#2 (P#1) PU L#3 (P#21) This is VM running on above compute # lstopo-no-graphics --no-io Machine (59GB total) NUMANode L#0 (P#0 29GB) + Package L#0 + L3 L#0 (16MB) L2 L#0 (4096KB) + Core L#0 L1d L#0 (32KB) + L1i L#0 (32KB) + PU L#0 (P#0) L1d L#1 (32KB) + L1i L#1 (32KB) + PU L#1 (P#1) L2 L#1 (4096KB) + Core L#1 L1d L#2 (32KB) + L1i L#2 (32KB) + PU L#2 (P#2) L1d L#3 (32KB) + L1i L#3 (32KB) + PU L#3 (P#3) if you noticed P#0 and P#1 has own (32KB) cache per thread that is wrong presentation if you compare with physical CPU. This is a screenshot of AWS vs Openstack CPU Topology and looking at openstack its presentation is little odd, is that normal? https://imgur.com/a/2sPwJVC I am running CentOS7.6 with kvm 2.12 version.