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jpsollie
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Joined: 17 Aug 2013
Posts: 323
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 Posted: Sun Mar 27, 2022 8:23 am Post subject: zenstates.py additional P-states: how to reload cpufreq? |
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After enabling an additional P-state on my threadripper through the zenstates.py script,
the scaling governor doesn't see it.
I assume the linux kernel isn't made to simply detect an additional P-state
Any thoughts how to detect it?
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Zucca
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Joined: 14 Jun 2007
Posts: 3896
Location: Rasi, Finland
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| Posted: Sun Mar 27, 2022 8:45 am Post subject: |
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Interesting. I've never heard of this before. What's it's capabilities?
| README wrote: | | Requires root access and the msr kernel module loaded (just run "modprobe msr" as root). |
Have you loaded the module?
EDIT: | https://www.zenstates.protonrom.com/ wrote: | Due to differences between Zen/Zen+ and Zen2, the application will automatically turn on applicable controls.
For example, P-states don't work as expected on Zen2. Read and write operations complete successfully, but they seem to be ignored. Differences might be expected due to different AGESA and SMU versions as well.
The lack of public documentation makes things even harder. Unfortunately, it doesn't seem AMD is keen on releasing it for 17h family, so most of the work is done via reverse-engineering. |
... this is for windows version, but is applicable here.
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jpsollie
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Joined: 17 Aug 2013
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| Posted: Sun Mar 27, 2022 11:09 am Post subject: |
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| Zucca wrote: | Interesting. I've never heard of this before. What's it's capabilities?
| README wrote: | | Requires root access and the msr kernel module loaded (just run "modprobe msr" as root). |
Have you loaded the module?
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I suppose if I run zenstates.py -l and P3 shows as "enabled", it's fine.
| Quote: |
EDIT: | https://www.zenstates.protonrom.com/ wrote: | Due to differences between Zen/Zen+ and Zen2, the application will automatically turn on applicable controls.
For example, P-states don't work as expected on Zen2. Read and write operations complete successfully, but they seem to be ignored. Differences might be expected due to different AGESA and SMU versions as well.
The lack of public documentation makes things even harder. Unfortunately, it doesn't seem AMD is keen on releasing it for 17h family, so most of the work is done via reverse-engineering. |
... this is for windows version, but is applicable here. |
It's a zen+ threadripper, not zen2
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