Linux 5.17 To Bring AMD P-State, Many AMD & Intel Improvements, New Optimizations

[phoronix]

Phoronix: Linux 5.17 To Bring AMD P-State, Many AMD & Intel Improvements, New Optimizations

The Linux 5.16 stable kernel is slated for release tomorrow and it delivers on some grand improvements to kick off 2022. But as for great as the Linux 5.16 features are, we are already looking forward to the enhancements on deck with Linux 5.17...

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.17-Early-Features

[shmerl]

Is there a way to see that CPPC is enabled? I turned it on in UEFI (as well as preferred cores option), but I don't see cppc in the CPU flags.

[mlau]

Is there a way to see that CPPC is enabled? I turned it on in UEFI (as well as preferred cores option), but I don't see cppc in the CPU flags.

one of the acpi ssdt tables should contain a lot of "_CPC" strings if it's enabled. the cpu flag is only visible with the monolithic die chips (renoir and newer)

[shmerl]

one of the acpi ssdt tables should contain a lot of "_CPC" strings if it's enabled. the cpu flag is only visible with the monolithic die chips (renoir and newer)

How can that be checked?

[mlau]

How can that be checked?

as root:
mkdir ~/acpi ; cd acpi
cp /sys/firmware/acpi/tables/SSDT* .
iasl -d SSDT*
grep _CPC SSDT*.dsl

For each cpu you should get an entry like this:
SSDT4.dsl: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control

[shmerl]

as root:
mkdir ~/acpi ; cd acpi
cp /sys/firmware/acpi/tables/SSDT* .
iasl -d SSDT*
grep _CPC SSDT*.dsl

Thanks! I see a bunch of entries like this:

250: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
634: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
1018: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
1402: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
1786: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
2170: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
2554: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
2938: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
3322: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
3706: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
4090: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
4474: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
4858: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
5242: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
5626: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
6010: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
6394: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
6778: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
7162: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
7546: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
7930: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
8314: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
8698: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control
9082: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control

So it must be working.

[birdie]

as root:
mkdir ~/acpi ; cd acpi
cp /sys/firmware/acpi/tables/SSDT* .
iasl -d SSDT*
grep _CPC SSDT*.dsl

For each cpu you should get an entry like this:
SSDT4.dsl: Name (_CPC, Package (0x17) // _CPC: Continuous Performance Control

There's an easier way without installing anything:

grep -R _CPC /sys/firmware/acpi/tables
grep: /sys/firmware/acpi/tables/SSDT5: binary file matches

[Danny3]

I hope that the Kernel's Zstd code will be updated to the latest recently released Zstd version!
It would be very good for many users which use BTRFS + Zstd compression.

[Azrael5]

why not an Rc9?