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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 0BE16C1B0D8 for ; Mon, 14 Dec 2020 12:42:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B9B48206FB for ; Mon, 14 Dec 2020 12:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2439048AbgLNMll (ORCPT ); Mon, 14 Dec 2020 07:41:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2407257AbgLNMlS (ORCPT ); Mon, 14 Dec 2020 07:41:18 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EE7BC0613CF; Mon, 14 Dec 2020 04:40:38 -0800 (PST) Received: from zn.tnic (p200300ec2f0a470045f2ad4f8d5ac204.dip0.t-ipconnect.de [IPv6:2003:ec:2f0a:4700:45f2:ad4f:8d5a:c204]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id A62F51EC0518; Mon, 14 Dec 2020 13:40:36 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1607949636; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=GEjtONQLztM4l6fqlu0/p/U/N6XQIhTzVwLg91ABImU=; b=BENNIPNsDRYudHYbN0ot904umrFe64GAJovJIb9gbrPuMgUsbXmNIfrhti6TgbsIVQmDCV fNCewDuF45fiMtsoPpNEjqbYPIxcJHhYv9EZGoiJdRzG/Sbaok8Pcby3/F4/WzzRVt9Xq/ G/FcXZK8QfehzOTIBFKFMme0p3S2qvw= Date: Mon, 14 Dec 2020 13:40:23 +0100 From: Borislav Petkov To: Punit Agrawal Cc: Wei Huang , rjw@rjwysocki.net, wei.huang2@amd.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, x86@kernel.org Subject: Re: [RFC PATCH 2/4] cpufreq: acpi-cpufreq: Add processor to the ignore PSD override list Message-ID: <20201214124023.GA25916@zn.tnic> References: <20201125144847.3920-1-punitagrawal@gmail.com> <20201125144847.3920-3-punitagrawal@gmail.com> <20201207202610.GG20489@zn.tnic> <20201207223057.GJ20489@zn.tnic> <87a6unq3xv.fsf@stealth> <20201208233216.GH27920@zn.tnic> <871rfvoqy7.fsf@stealth> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <871rfvoqy7.fsf@stealth> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Dec 12, 2020 at 08:36:48AM +0900, Punit Agrawal wrote: > To me it suggests, that there are likely more systems from the family > that show the characteristic described below. Until we find a *single* system with a broken BIOS which has those objects kaputt and then this heuristic would need an exception. VS the clear statement from AMD that from zen3 onwards, all BIOS will be tested. I hope they boot Linux at least before they ship. > In all these systems, the override causes this topology information to > be ignored - treating each core to be a separate domain. The proposed > patch removes the override so that _PSD is taken into account. You're still not answering my question: what does the coupling of the SMT threads bring on those systems? Power savings? Perf improvement? Anything palpable or measurable? Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette