From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 12776C43387 for ; Mon, 31 Dec 2018 17:26:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8B6F20652 for ; Mon, 31 Dec 2018 17:26:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727565AbeLaR05 (ORCPT ); Mon, 31 Dec 2018 12:26:57 -0500 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:60453 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726722AbeLaR04 (ORCPT ); Mon, 31 Dec 2018 12:26:56 -0500 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id 1C729808B9; Mon, 31 Dec 2018 18:26:50 +0100 (CET) Date: Mon, 31 Dec 2018 18:26:54 +0100 From: Pavel Machek To: David Wang 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> References: <1545900110-2757-1-git-send-email-davidwang@zhaoxin.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="5I6of5zJg18YgZEa" Content-Disposition: inline In-Reply-To: <1545900110-2757-1-git-send-email-davidwang@zhaoxin.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --5I6of5zJg18YgZEa Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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 > Reviewed-by: Thomas Gleixner Acked-by: Pavel Machek --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --5I6of5zJg18YgZEa Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlwqUV4ACgkQMOfwapXb+vIUAACgjrtljk2juAmf4OAYGo1GtH4P OpEAnAsXfd1wmlwcy7QcgyijpvZGT5vz =JuLQ -----END PGP SIGNATURE----- --5I6of5zJg18YgZEa--