Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture

On Wed, Sep 21, 2022 at 05:00:35PM +0200, Peter Zijlstra wrote:

On Wed, Sep 21, 2022 at 12:06:38PM +0530, K Prateek Nayak wrote:

...

Processors based on the Zen microarchitecture support IOPORT based deeper C-states.

I've just gotta ask; why the heck are you using IO port based idle states in 2022 ?!?! You have have MWAIT, right?

They have both. And both is Intel technology. And as I'm sure you know AMD can't do their own thing - they kinda have to follow Intel. Unfortunately.

Are you saying modern Intel chipsets don't do IO-based C-states anymore?