linux-kernel - Re: [PATCH] intel_idle: Add ICL support

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Message-ID: <CAJZ5v0gPY+7YBeWwszoNBwsbKLFOEeuLaekdX62_gvbHXB8xoA@mail.gmail.com>
Date:   Wed, 26 Aug 2020 18:43:52 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Artem Bityutskiy <dedekind1@...il.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Guilhem Lettron <guilhem@...pilot.io>,
        Zhang Rui <rui.zhang@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Len Brown <lenb@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] intel_idle: Add ICL support

On Wed, Aug 26, 2020 at 6:39 PM Artem Bityutskiy <dedekind1@...il.com> wrote:
>
> On Wed, 2020-08-26 at 18:02 +0200, Rafael J. Wysocki wrote:
> > To that end, I would try to upgrade the graphics firmware and see if
> > you can get some nonzero PC8 residency then.
>
> I am curious, somehow that patch makes a difference.

It does make a difference, because it makes the processor spend more
time in PC2.  Which very well may be because the processor cannot
enter deeper C-states.