Originally posted by MadCatX
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New AMD P-State Driver Headlines The Power Management Updates For Linux 5.17
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You can check whether CPPC is exposed with something like this:
Code:sudo cp /sys/firmware/acpi/tables/SSDT* . chown $USER:$USER SSDT* iasl -d SSDT* rg CPC *.dsl
Code:Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
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Originally posted by agd5f View Post
The idea is to only run the CPU as fast as you need to hit your work deadline.## VGA ##
AMD: X1950XTX, HD3870, HD5870
Intel: GMA45, HD3000 (Core i5 2500K)
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Originally posted by darkbasic View Post
This means nothing to me, how does it determine if/how to meet your deadline? If you're running a sustained workload your deadline is to finish it ASAP, otherwise you're wasting your money on a faster CPU which you're actually not using.Last edited by shmerl; 11 January 2022, 02:35 PM.
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Originally posted by darkbasic View Post
This means nothing to me, how does it determine if/how to meet your deadline? If you're running a sustained workload your deadline is to finish it ASAP, otherwise you're wasting your money on a faster CPU which you're actually not using.
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Originally posted by darkbasic View Post
This means nothing to me, how does it determine if/how to meet your deadline? If you're running a sustained workload your deadline is to finish it ASAP, otherwise you're wasting your money on a faster CPU which you're actually not using.
Also, using the performance governor all the time won't burn your CPU, since it will still enter its deepest sleep states and thus save more power than by simple downclocking.
Here's a very basic test anyone can try out for themselves:
Playback a video with the performance governor and run this command in the terminal at various intervalls:
Code:sudo cpupower monitor
I'd really like to know how the situation is with AMD Ryzens, so if anyone could provide that info, would be appreciated.
Thanks!
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Originally posted by agd5f View Post
If you are working a document in a word processor or doing some web browsing, there no need to ramp the the CPU to the max frequency constantly every time that task schedules. The user experience of working with that document will be the same whether or not the CPU is at the max frequency or not. As I said, the tricky part is deciding what the right algorithm is in the governor. These patches just provide the knobs. The governors still dictate the performance.
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Originally posted by Linuxxx View Post
So true!
Also, using the performance governor all the time won't burn your CPU, since it will still enter its deepest sleep states and thus save more power than by simple downclocking.
Here's a very basic test anyone can try out for themselves:
Playback a video with the performance governor and run this command in the terminal at various intervalls:
Code:sudo cpupower monitor
I'd really like to know how the situation is with AMD Ryzens, so if anyone could provide that info, would be appreciated.
Thanks!
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What Intel had successfully provided:- HWP
- EEO
- R2H
AMD has recently commited CPPC MSR registers to provide a better latency control operation over those classes of frequencies. It's very close to the Intel HWP.
So far, assembly reading of those MSR is failing with my MATISSE/3950X
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