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

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Message-ID: <d0ca671465e6ce72c6c4d5178440ebc1e4814da8.camel@gmail.com>
Date:   Wed, 26 Aug 2020 16:16:19 +0300
From:   Artem Bityutskiy <dedekind1@...il.com>
To:     Guilhem Lettron <guilhem@...pilot.io>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     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, 2020-08-26 at 15:03 +0200, Guilhem Lettron wrote:
> On Wed, 26 Aug 2020 at 14:43, Rafael J. Wysocki <rafael@...nel.org> wrote:
> > On Wed, Aug 26, 2020 at 2:05 PM Guilhem Lettron <guilhem@...pilot.io> wrote:
> > > Use the same C-states as SKL
> > 
> > Why is this change needed?
> 
> On my laptop, a Dell XPS 13 7390 2-in-1 with i7-1065G7, ACPI only
> report "C1_ACPI", "C2_ACPI" and "C3_ACPI".

Also, if you could runt turbostat - we could see which _actual_ HW C-
states are used on your system, which Package C-states are reached.

Just get a reasonably new turbostat (it is part of the kernel tree, you
can compile it yourself) and run it for few seconds (like 'turbostat
sleep 10'), get the output (will be a lot of it), and we can check what
is actually going on with regards to C-states.

Artem.