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

[Dave Hansen]

On 9/22/22 08:53, Rafael J. Wysocki wrote:
> 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.

Just to be clear: The _original_ AMD Zen problem that this thread is
addressing is from a *default* configuration, right?  It isn't that
someone overrode the idle defaults?