[Starlingx-discuss] How to enable cpu_dedicated_set

[Khalil, Ghada]

Hello,
Regarding the question below:
       Is there way I can enable application-isolation across all the worker nodes including new nodes to be added in future?

Application-isolated CPUs are configured on a per-host basis. When new nodes are added, they will need to be explicitly configured.

Is there a specific use-case that you have where it would be beneficial for new nodes to automatically inherit the config of an existing node? There was an old capability where host profiles could be created and applied to new nodes. But this proved problematic as exact hardware matches were not guaranteed. As a result, this capability was abandoned a long time ago.

Regards,
Ghada

From: open infra <openinfradn at gmail.com>
Sent: Wednesday, September 28, 2022 3:32 AM
To: Brito, Thiago <Thiago.Brito at windriver.com>
Cc: starlingx-discuss at lists.starlingx.io
Subject: Re: [Starlingx-discuss] How to enable cpu_dedicated_set

[Please note: This e-mail is from an EXTERNAL e-mail address]


On Wed, Dec 8, 2021 at 3:16 AM Brito, Thiago <Thiago.Brito at windriver.com<mailto:Thiago.Brito at windriver.com>> wrote:
Did you do an application-apply after you changed the processors to application-isolated? Can you send the output of the command below for you compute pods:

kubectl exec -n openstack nova-compute-[woker|controller]-X-XXXXX-xxxx -- cat /etc/nova/nova.conf|grep dedicated_set


Is there way I can enable application-isolation across all the worker nodes including new nodes to be added in future?

Don't forget to change the id of the pod for your compute pods.

Thiago
________________________________
From: open infra <openinfradn at gmail.com<mailto:openinfradn at gmail.com>>
Sent: Tuesday, December 7, 2021 5:45 AM
To: Brito, Thiago <Thiago.Brito at windriver.com<mailto:Thiago.Brito at windriver.com>>
Cc: starlingx-discuss at lists.starlingx.io<mailto:starlingx-discuss at lists.starlingx.io> <starlingx-discuss at lists.starlingx.io<mailto:starlingx-discuss at lists.starlingx.io>>
Subject: Re: [Starlingx-discuss] How to enable cpu_dedicated_set


[Please note: This e-mail is from an EXTERNAL e-mail address]
Here is the info from STX side


Processors
2
Physical Cores Per Processor
32
Hyper-Threading
Yes
CPU Assignments
Create Cpu Profile<https://urldefense.com/v3/__http:/37.50.100.18:8080/admin/8/addcpuprofile/__;!!AjveYdw8EvQ!Km5xOEiy_wI3YAmney4OpHhqwjOOCiNhB37qanNSizdNpERIM_eDDRfwAzNuQoVun-HI$>
Function
Processor Logical Cores
Platform
Processor 0 : 0,64
vSwitch
Shared
Application
Processor 0 : 17-31,81-95
Processor 1 : 56-63,120-127
Application-isolated
Processor 0 : 1-16,65-80
Processor 1 : 32-55,96-119

On Tue, Dec 7, 2021 at 1:46 PM open infra <openinfradn at gmail.com<mailto:openinfradn at gmail.com>> wrote:
Hi Thiago,

I have configured the worker as mentioned in the given link and dedicated cpu_policy set in the flavor.
Instance creation failed with the following error.


No valid host was found. There are not enough hosts available.



controller-0:~$ openstack flavor show dn.large  -c properties

+------------+--------------------------------------------------------------------------------------------------------+

| Field      | Value                                                                                                  |

+------------+--------------------------------------------------------------------------------------------------------+

| properties | hw:cpu_cores='2', hw:cpu_policy='dedicated', hw:cpu_sockets='1', hw:cpu_threads='2', hw:numa_nodes='1' |

+------------+--------------------------------------------------------------------------------------------------------+


Regards,
Danishka

On Tue, Dec 7, 2021 at 1:18 AM Brito, Thiago <Thiago.Brito at windriver.com<mailto:Thiago.Brito at windriver.com>> wrote:
Hi Danishka,

Whatever you configure on the platform as Application-isolated core for a node will get to cpu_dedicated_set on stx-openstack. Please check this doc: https://docs.starlingx.io/r/stx.5.0/admintasks/openstack/configure-dedicated-and-shared-cpu-pools-on-hosts.html<https://urldefense.com/v3/__https:/docs.starlingx.io/r/stx.5.0/admintasks/openstack/configure-dedicated-and-shared-cpu-pools-on-hosts.html__;!!AjveYdw8EvQ!Km5xOEiy_wI3YAmney4OpHhqwjOOCiNhB37qanNSizdNpERIM_eDDRfwAzNuQv9j-Hlr$>

Thiago
________________________________
From: open infra <openinfradn at gmail.com<mailto:openinfradn at gmail.com>>
Sent: Monday, December 6, 2021 3:15 PM
To: starlingx-discuss at lists.starlingx.io<mailto:starlingx-discuss at lists.starlingx.io> <starlingx-discuss at lists.starlingx.io<mailto:starlingx-discuss at lists.starlingx.io>>
Subject: [Starlingx-discuss] How to enable cpu_dedicated_set


[Please note: This e-mail is from an EXTERNAL e-mail address]
Hi,

Is the cpu_dedicated_set is already enabled in stx based openstack?
How to verify and enable it?

Regards,
Danishka
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