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

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To: Borislav Petkov <bp@xxxxxxxxx>
Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
From: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>
Date: Thu, 22 Sep 2022 17:53:17 +0200
Cc: "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, K Prateek Nayak <kprateek.nayak@xxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, ACPI Devel Maling List <linux-acpi@xxxxxxxxxxxxxxx>, Linux PM <linux-pm@xxxxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, andi@xxxxxxxx, Pu Wen <puwen@xxxxxxxx>, Mario Limonciello <mario.limonciello@xxxxxxx>, "Zhang, Rui" <rui.zhang@xxxxxxxxx>, "Guilherme G. Piccoli" <gpiccoli@xxxxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, ananth.narayan@xxxxxxx, gautham.shenoy@xxxxxxx, Calvin Ong <calvin.ong@xxxxxxx>, Stable <stable@xxxxxxxxxxxxxxx>, regressions@xxxxxxxxxxxxxxx
In-reply-to: <YyyA9AV9qiPxmmpb@zn.tnic>
References: <20220921063638.2489-1-kprateek.nayak@amd.com> <YysnE8rcZAOOj28A@hirez.programming.kicks-ass.net> <YytqfVUCWfv0XyZO@zn.tnic> <YywaAcTdLSuDlRfl@hirez.programming.kicks-ass.net> <CAJZ5v0i9P-srVxrSPZOkXhKVCA2vEQqm5B4ZZifS=ivpwv+A-w@mail.gmail.com> <YyyA9AV9qiPxmmpb@zn.tnic>

On Thu, Sep 22, 2022 at 5:36 PM Borislav Petkov <bp@xxxxxxxxx> wrote:
>
> On Thu, Sep 22, 2022 at 05:21:21PM +0200, Rafael J. Wysocki wrote:
> > Well, it can be forced to use ACPI idle instead.
>
> Yeah, I did that earlier. The dummy IO read in question costs ~3K on
> average on my Coffeelake box here.

Well, that's the cost of forcing something non-default.

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

References:
- [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: K Prateek Nayak
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Peter Zijlstra
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Borislav Petkov
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Peter Zijlstra
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Rafael J. Wysocki
- Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture
  - From: Borislav Petkov

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