AMD Posts 11th Iteration Of P-State Preferred Core Patches For Linux

[phoronix]

Phoronix: AMD Posts 11th Iteration Of P-State Preferred Core Patches For Linux

For the past number of months AMD has been actively working on enabling AMD P-State Preferred Core functionality for Linux so that their modern processors can communicate "preferred" cores to the Linux kernel scheduler for making better decisions around task placement and ultimately ensuring best performance of Ryzen and EPYC processors running on Linux. This week they are up to their 11th take on these kernel patches...

https://www.phoronix.com/news/AMD-P-State-Preferred-Core

[Kjell]

Enable with kernel argument:

amd_prefcore=enable

Reboot and validate:

cat /sys/devices/system/cpu/amd_pstate/prefcore_state​

[skeevy420]

Enable with kernel argument:

amd_prefcore=enable

Reboot and validate:

cat /sys/devices/system/cpu/amd_pstate/prefcore_state​

It's enabled by default on CachyOS and can be checked at

❯cat /sys/devices/system/cpu/amd_pstate/prefcore
enabled

That's using amd_pstate=guided in the command line with schedutil as the governor.

[darkbasic]

Enable with kernel argument:

amd_prefcore=enable

Reboot and validate:

cat /sys/devices/system/cpu/amd_pstate/prefcore_state​

I'm currently using v10 and it's enabled by default:

[niko@arch-phoenix ~]$ cat /sys/devices/system/cpu/amd_pstate/prefcore
enabled​

[cytomax55]

I'm currently using v10 and it's enabled by default:

[niko@arch-phoenix ~]$ cat /sys/devices/system/cpu/amd_pstate/prefcore
enabled​

How can I tell what version I am running

[cytomax55]

Enable with kernel argument:

amd_prefcore=enable

Reboot and validate:

cat /sys/devices/system/cpu/amd_pstate/prefcore_state​

The article makes it seem like it hasn't even been added to kernel 6.8 how can we enable something that hasn't been added yet?

[agd5f]

The article makes it seem like it hasn't even been added to kernel 6.8 how can we enable something that hasn't been added yet?

You can apply the patches yourself and build a new kernel.

[cytomax55]

You can apply the patches yourself and build a new kernel.

Ty, That's a little above my pay grade I have no idea I'll just wait till the kernel comes out Thank you for letting me know

[agd5f]

Ty, That's a little above my pay grade I have no idea I'll just wait till the kernel comes out Thank you for letting me know

There may be distros that provide test kernels with the patches applied.

[geearf]

It's enabled by default on CachyOS and can be checked at

❯cat /sys/devices/system/cpu/amd_pstate/prefcore
enabled

That's using amd_pstate=guided in the command line with schedutil as the governor.

Is guided 'better' than active?