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Date:   Thu, 2 Nov 2023 15:05:08 +0700
From:   Bagas Sanjaya <bagasdotme@gmail.com>
To:     Huang Rui <ray.huang@amd.com>, Meng Li <li.meng@amd.com>,
        Perry Yuan <Perry.Yuan@amd.com>,
        Mateusz Guzik <mjguzik@gmail.com>,
        Linus Torvalds <torvalds@linux-foundation.org>
Cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Michele Della Guardia <micheledellaguardia@yahoo.it>,
        Linux Power Management <linux-pm@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux Regressions <regressions@lists.linux.dev>
Subject: Re: Fwd: Abnormal battery drain with kernel 6.5 (Ryzen 5500u)
Message-ID: <ZUNYNEnGC8cm6ALH@debian.me>
References: <bede02c1-ef90-8e30-aa8b-e6fae49a8ccf@gmail.com>
 <ZPql6tqBCnXJh64J@amd.com>
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On Fri, Sep 08, 2023 at 12:41:14PM +0800, Huang Rui wrote:
> On Fri, Sep 01, 2023 at 05:42:22PM +0800, Bagas Sanjaya wrote:
> > Hi,
> >=20
> > I notice a regression report on Bugzilla [1] that have been already han=
dled
> > there. Quoting from it:
> >=20
> > > After switching from 6.4.x kernel to 6.5 I experienced an abnormal ba=
ttery drain since my laptop is actually never idle.
> > > I accepted default CPUfreq to schedutil and AMD Processor P-State mod=
e is 3 (active).=20
> > >=20
> > > I expected a different behaviour, but am I missing something?
> > > In my boot configuration I had "amd_pstate.shared_mem=3D1" and tried =
to remove this switch, but did not affect my power consuption.
> > >=20
> > > Is there something changed from 6.4.x to 6.5 that requires a differen=
t configuration to get an optimal power consumption?
> > >=20
> > > Thanks a lot for your attention
> >=20
> > See Bugzilla for the full thread.
> >=20
> > Anyway, I'm adding it to regzbot:
> >=20
> > #regzbot introduced: v6.4..v6.5 https://bugzilla.kernel.org/show_bug.cg=
i?id=3D217853
> >=20
>=20
> + Meng Li/Perry,
>=20
> May we know which CPU type are you using? Try "lscpu"?
>=20

Sorry for the replying just now.

The reporter (on Bugzilla) had bisected to commit c8afaa1b0f8bc9 ("locking:
remove spin_lock_prefetch"). Telling regzbot:

#regzbot introduced: c8afaa1b0f8bc9
#regzbot title: spin_lock_prefetch() removal causes abnormal battery drain =
on Ryzen 5500u

Thanks.

--=20
An old man doll... just what I always wanted! - Clara

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