About emulator thread pinning in Red Hat OpenStack Platform

Issue

• About the configuration of emulator thread pinning in Red Hat OpenStack Platform.

• About the impact of using virsh emulatorpin in virtual environments, particularly in Red Hat OpenStack Platform with NFV.

• How nova behaves in Red Hat OpenStack Platform 10 and above, and how administrators should place qemu-kvm's emulator threads to avoid spurious packet loss, especially when isolcpus is used.

• In the instance log:

unable to map backing store for guest RAM: Cannot allocate memory