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

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Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 21 Sep 2022 17:00:35 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx, rafael@xxxxxxxxxx, lenb@xxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, bp@xxxxxxxxx, tglx@xxxxxxxxxxxxx, andi@xxxxxxxx, puwen@xxxxxxxx, mario.limonciello@xxxxxxx, rui.zhang@xxxxxxxxx, gpiccoli@xxxxxxxxxx, daniel.lezcano@xxxxxxxxxx, ananth.narayan@xxxxxxx, gautham.shenoy@xxxxxxx, Calvin Ong <calvin.ong@xxxxxxx>, stable@xxxxxxxxxxxxxxx, regressions@xxxxxxxxxxxxxxx
In-reply-to: <20220921063638.2489-1-kprateek.nayak@amd.com>

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?

Follow-Ups:
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Borislav Petkov

References:
- [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: K Prateek Nayak

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