Public bug reported:
If [libvirt]cpu_power_management is set to true but
[compute]cpu_dedicated_set is empty nova-compute is fails to start with:
2023-11-16 10:42:42.444 2 ERROR oslo_service.service [None
req-56dbf76c-524c-455d-9c64-d3474509e8d0 - - - - - -] Error starting thread.:
nova.exception.InvalidConfiguration: '[compute]/cpu_dedicated_set' is mandatory
to be set if '[libvirt]/cpu_power_management' is set.Please provide the CPUs
that can be pinned or don't use the power management if you only use shared
CPUs.
2023-11-16 10:42:42.444 2 ERROR oslo_service.service Traceback (most recent
call last):
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/oslo_service/service.py", line 806, in
run_service
2023-11-16 10:42:42.444 2 ERROR oslo_service.service service.start()
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/service.py", line 162, in start
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
self.manager.init_host(self.service_ref)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 1608, in
init_host
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
self.driver.init_host(host=self.host)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 831, in
init_host
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
libvirt_cpu.power_down_all_dedicated_cpus()
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/virt/libvirt/cpu/api.py", line 122, in
power_down_all_dedicated_cpus
2023-11-16 10:42:42.444 2 ERROR oslo_service.service raise
exception.InvalidConfiguration(msg)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
nova.exception.InvalidConfiguration: '[compute]/cpu_dedicated_set' is mandatory
to be set if '[libvirt]/cpu_power_management' is set.Please provide the CPUs
that can be pinned or don't use the power management if you only use shared
CPUs.
This is not a functional bug. But it is a UX bug. I would like to independently
enable the CPU power management feature from configuring pinned CPU cores even
if it means the no CPU cores is power managed while cpu_dedicated_set is empty.
Imagine a deployment engine that would like to enable
cpu_power_management automatically by default. But it cannot defined the
list of pinned CPU cores at the same time as that his hypervisor HW
dependent. The current strict validation prevents enabling
cpu_power_management before defining the list of PCPUs.
The actual power management logic can gracefully handle the case when
zero PCPUs are defined simply by managing all the PCPUs i.e. managing no
PCPUs in this case.
** Affects: nova
Importance: Undecided
Status: New
** Tags: libvirt
** Tags added: libvirt
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https://bugs.launchpad.net/bugs/2043707
Title:
Cannot separately enable cpu_power_management and cpu pinning
Status in OpenStack Compute (nova):
New
Bug description:
If [libvirt]cpu_power_management is set to true but
[compute]cpu_dedicated_set is empty nova-compute is fails to start
with:
2023-11-16 10:42:42.444 2 ERROR oslo_service.service [None
req-56dbf76c-524c-455d-9c64-d3474509e8d0 - - - - - -] Error starting thread.:
nova.exception.InvalidConfiguration: '[compute]/cpu_dedicated_set' is mandatory
to be set if '[libvirt]/cpu_power_management' is set.Please provide the CPUs
that can be pinned or don't use the power management if you only use shared
CPUs.
2023-11-16 10:42:42.444 2 ERROR oslo_service.service Traceback (most recent
call last):
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/oslo_service/service.py", line 806, in
run_service
2023-11-16 10:42:42.444 2 ERROR oslo_service.service service.start()
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/service.py", line 162, in start
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
self.manager.init_host(self.service_ref)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 1608, in
init_host
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
self.driver.init_host(host=self.host)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 831, in
init_host
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
libvirt_cpu.power_down_all_dedicated_cpus()
2023-11-16 10:42:42.444 2 ERROR oslo_service.service File
"/usr/lib/python3.9/site-packages/nova/virt/libvirt/cpu/api.py", line 122, in
power_down_all_dedicated_cpus
2023-11-16 10:42:42.444 2 ERROR oslo_service.service raise
exception.InvalidConfiguration(msg)
2023-11-16 10:42:42.444 2 ERROR oslo_service.service
nova.exception.InvalidConfiguration: '[compute]/cpu_dedicated_set' is mandatory
to be set if '[libvirt]/cpu_power_management' is set.Please provide the CPUs
that can be pinned or don't use the power management if you only use shared
CPUs.
This is not a functional bug. But it is a UX bug. I would like to
independently enable the CPU power management feature from configuring pinned
CPU cores even if it means the no CPU cores is power managed while
cpu_dedicated_set is empty.
Imagine a deployment engine that would like to enable
cpu_power_management automatically by default. But it cannot defined
the list of pinned CPU cores at the same time as that his hypervisor
HW dependent. The current strict validation prevents enabling
cpu_power_management before defining the list of PCPUs.
The actual power management logic can gracefully handle the case when
zero PCPUs are defined simply by managing all the PCPUs i.e. managing
no PCPUs in this case.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nova/+bug/2043707/+subscriptions
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