AMD P-State EPP Submitted For Linux 6.3 To Improve CPU Performance/Power

[phoronix]

Phoronix: AMD P-State EPP Submitted For Linux 6.3 To Improve CPU Performance/Power

The ACPI, thermal, and power management changes for Linux 6.3 have been submitted early due to traveling next week by ACPI/PM maintainer Rafael Wysocki. Most significant with the Linux 6.3 power management updates is adding of the AMD P-State Energy Preference Performance (EPP) mode for helping to deliver better performance and power efficiency for modern AMD Ryzen and EPYC systems on Linux...

https://www.phoronix.com/news/Linux-6.3-Power-Management

[kiffmet]

The guided mode + schedutil is pretty nice, ngl.

[Linuxxx]

It would be good if this could be integrated into the in-kernel cpupower tool for easy management, like Intel currently does.

Querying the current EPP state is as easy as:

sudo cpupower -c all info

However, Intel currently uses values between 0-15, whereas it looks like AMD is going for 0-255.

I think standardizing on a common input between all vendors is better for Linux in general, so that we don't end up having to adjust scripts for each new entrant...

[ptr1337]

The guided mode + schedutil is pretty nice, ngl.

Yes, can confirm it. Also using it.
But sadly it seems not to get merged into 6.3.

https://lore.kernel.org/lkml/[email protected]/

[Mitch]

6.1 - 6.3 will be an interesting series on energy efficiency with all the AMD patches on energy usage and with Linux 6.2's general reduction in CPU during light and idle loads (regardless of CPU) through lazy RCU. Intel also had some energy efficiency improvements in this series. I imagine a tuned 5.19 kernel will be notably less efficient than a tuned 6.3 kernel across the board.

[FireBurn]

Would you mind applying the patches yourself, would be good to see this benchmarked *before* it's merged, just in case it doesn't actually improve things