Received: by 2002:a05:6359:c8b:b0:c7:702f:21d4 with SMTP id go11csp1056398rwb; Thu, 22 Sep 2022 09:32:29 -0700 (PDT) X-Google-Smtp-Source: AMsMyM6O86zQS+OtUQo15qyCviyk95hTpXXfcGLuZ7A+uuaXAv7rJ8l19kVRSqOvLAj/RooLTyG2 X-Received: by 2002:a63:63c6:0:b0:438:63d8:42c4 with SMTP id x189-20020a6363c6000000b0043863d842c4mr3631426pgb.525.1663864349612; Thu, 22 Sep 2022 09:32:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1663864349; cv=none; d=google.com; s=arc-20160816; b=IXnoeNvUQZwrpgoTHk33GjTExvfiVYKTvYPm62qalKapLBZdOXChUR3JbXzm4fkDJK zrlgKWavNiJAp2FSwoEk7wzSnp/BrTOWfTwdq2fHe1C88QFXzRKGKGeWgZvIDImL5era i/doMLI+i2zqs5ASLSJnaw0Fz9qaDUyPxcjrgjXs9X5UBe7gHiBk4SgGJpzkeeQiO84Y /8CEAAN52I6Osr970kazmW+e+8w2v4Vt42hlrYGXga65gB4M88+rVSq4ELufycOBj7zT +O/7h89g4Qp5wBBs288ChkRPv16HVq/Ucjt/u39kSRlgV5S4pNJiz66VCi46UFRhlMIv pHCw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:in-reply-to:content-disposition:mime-version :references:message-id:subject:cc:to:from:date:dkim-signature; bh=wRMP9slYyN0/QDW1WIR4Q0VabXcD/EBlo0OElvXvF1M=; b=TAEquQHtBC9LpfBZVG+cOZHnHKgGoNTGqHq5tHSJhNmFoKzfwDGryllzcAxZDeg1u4 6Jk73tFUYUCDkcWPXiH2q/a12My5s+3Qv+c5dyzevpXm2iFikwHeZuUZ8kHFqkt+Q0H5 wXMJuguWE9ZFqs6t6GsJy+EIYM5E81frclifVevCJKsVsGXdTk1PyO5502DeuUx5lY0H YYDPh6kE0VU53+tEtFcz+pXcU9UdthrgISUDTf1S/aO1iFenPeTbJ9OZ4TtZyh9QBS4D NOjweNqipLNcVX6s3H19Ps38JydKbifkTOucfSGmHM/td/0RJHUog77U1u9HCd8Ndzpz zaGg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b="P9oPtr/R"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Return-Path: Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id j5-20020a17090276c500b0016d17cde503si274071plt.143.2022.09.22.09.32.15; Thu, 22 Sep 2022 09:32:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@alien8.de header.s=dkim header.b="P9oPtr/R"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=alien8.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231190AbiIVPgc (ORCPT + 99 others); Thu, 22 Sep 2022 11:36:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230213AbiIVPgb (ORCPT ); Thu, 22 Sep 2022 11:36:31 -0400 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F51B100A8D; Thu, 22 Sep 2022 08:36:30 -0700 (PDT) Received: from zn.tnic (p200300ea9733e7fe329c23fffea6a903.dip0.t-ipconnect.de [IPv6:2003:ea:9733:e7fe:329c:23ff:fea6:a903]) (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 84D9B1EC03EA; Thu, 22 Sep 2022 17:36:24 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1663860984; 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=wRMP9slYyN0/QDW1WIR4Q0VabXcD/EBlo0OElvXvF1M=; b=P9oPtr/R8OYSyNe2qXmpk0vA3zKYyaaOGV85o6RKATj0lPSE0L86zkRGg+NGRBPTBYMsBx x6TR1a2rIucS1tovgxro51vEOkKkMxxoFXue7hc69IdkCqdIfZ3b0POcCScmdP1V3WhmwN PJOBRFSrmCJuett0M62R6ujii54McQc= Date: Thu, 22 Sep 2022 17:36:20 +0200 From: Borislav Petkov To: "Rafael J. Wysocki" Cc: Peter Zijlstra , K Prateek Nayak , Linux Kernel Mailing List , Len Brown , ACPI Devel Maling List , Linux PM , Dave Hansen , Thomas Gleixner , andi@lisas.de, Pu Wen , Mario Limonciello , "Zhang, Rui" , "Guilherme G. Piccoli" , Daniel Lezcano , ananth.narayan@amd.com, gautham.shenoy@amd.com, Calvin Ong , Stable , regressions@lists.linux.dev Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture Message-ID: References: <20220921063638.2489-1-kprateek.nayak@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 22, 2022 at 05:21:21PM +0200, Rafael J. Wysocki wrote: > Well, it can be forced to use ACPI idle instead. Yeah, I did that earlier. The dummy IO read in question costs ~3K on average on my Coffeelake box here. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette