9724ec118b
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
15 lines
746 B
YAML
15 lines
746 B
YAML
---
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features:
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- |
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Introduces ``[compute]/cpu_shared_set`` option for compute nodes.
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Some workloads run best when the hypervisor overhead processes
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(emulator threads in libvirt/QEMU) can be placed on different
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physical host CPUs than other guest CPU resources. This allows
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those workloads to prevent latency spikes for guest vCPU threads.
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To place a workload's emulator threads on a set of isolated
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physical CPUs, set the ``[compute]/cpu_shared_set`` configuration
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option to the set of host CPUs that should be used for best-effort
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CPU resources. Then set a flavor extra spec to
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``hw:emulator_threads_policy=share`` to instruct nova to place
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that workload's emulator threads on that set of host CPUs. |