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Some workloads run best when the hypervisor overhead processes
(emulator threads in libvirt/QEMU) can be placed on different physical
host CPUs than other guest CPU resources. This allows those workloads
to prevent latency spikes for guest vCPU threads.
To ensure emulator threads are placed on a different set of physical
CPUs than those running guest dedicated vCPUs, set the
``CONF.compute.cpu_shared_set`` configuration option to the set of host
CPUs that should be used for best-effort CPU resources. Then set a
flavor extra spec to ``hw:emulator_threads_policy=share`` to instruct
nova to place that workload's emulator threads on that set of host CPUs.
implement: bp/overhead-pin-set
Signed-off-by: Sahid Orentino Ferdjaoui <sahid.ferdjaoui@redhat.com>
Change-Id: I0e63ab37d584ee3d7fde6553efaa61bfc866e67d
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