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Date:   Mon, 31 Dec 2018 18:26:54 +0100
From:   Pavel Machek <pavel@ucw.cz>
To:     David Wang <davidwang@zhaoxin.com>
Cc:     rjw@rjwysocki.net, mingo@redhat.com, len.brown@intel.com,
        tglx@linutronix.de, hpa@zytor.com, x86@kernel.org,
        linux-pm@kernel.org, linux-kernel@vger.kernel.org,
        brucechang@via-alliance.com, cooperyan@zhaoxin.com,
        qiyuanwang@zhaoxin.com, timguo@zhaoxin.com
Subject: Re: [PATCH v3] Optimize C3 entry on Centaur CPUs
Message-ID: <20181231172654.GB14092@amd>
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On Thu 2018-12-27 16:41:50, David Wang wrote:
> For new Centaur CPUs the ucode will take care of the preservation of cach=
e coherence
> between CPU cores in C-states regardless of how deep the C-states are. So=
, it is not
> necessary to flush the caches in software befor entering C3. And this use=
less operation
> will cause performance drop for the cores which share some caches with th=
e idling core. =20
>=20
> Signed-off-by: David Wang <davidwang@zhaoxin.com>
> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

Acked-by: Pavel Machek <pavel@ucw.cz>

--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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