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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42C7EC77B75 for ; Mon, 8 May 2023 10:26:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234560AbjEHK0y (ORCPT ); Mon, 8 May 2023 06:26:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234605AbjEHK00 (ORCPT ); Mon, 8 May 2023 06:26:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35C23DC51 for ; Mon, 8 May 2023 03:26:17 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A4B79625ED for ; Mon, 8 May 2023 10:26:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B4B9EC433EF; Mon, 8 May 2023 10:26:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683541576; bh=j/mPZS7kgKYD73kBxo+nVDPwW33Kchb6D8uYqg3Y1iE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AFBkSK3O+P9paz8ykq79s4I3nAnz7FD4+pqYNkm+G+NVdO7SDOodkr5uVFGV7sq3m w0BWXt6b1Ov0USpI/2gvYDfJ3rqzJsoyO6u6HlPKdn8ZgnHNbKhPw9wStBsFS7W3Mv XdjJskrjGF0FEXJIOKZI8jY6xgMj5yN6TiqCd7PE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vincent Guittot , Bjorn Andersson , Sasha Levin Subject: [PATCH 6.2 159/663] arm64: dts: qcom: sdm845: correct dynamic power coefficients Date: Mon, 8 May 2023 11:39:45 +0200 Message-Id: <20230508094433.658633867@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094428.384831245@linuxfoundation.org> References: <20230508094428.384831245@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vincent Guittot [ Upstream commit 44750f153699b6e4f851a399287e5c8df208d696 ] While stressing EAS on my dragonboard RB3, I have noticed that LITTLE cores where never selected as the most energy efficient CPU whatever the utilization level of waking task. energy model framework uses its cost field to estimate the energy with the formula: nrg = cost of the selected OPP * utilization / CPU's max capacity which ends up selecting the CPU with lowest cost / max capacity ration as long as the utilization fits in the OPP's capacity. If we compare the cost of a little OPP with similar capacity of a big OPP like : OPP(kHz) OPP capacity cost max capacity cost/max capacity LITTLE 1766400 407 351114 407 863 big 1056000 408 520267 1024 508 This can be interpreted as the LITTLE core consumes 70% more than big core for the same compute capacity. According to [1], LITTLE consumes 10% less than big core for Coremark benchmark at those OPPs. If we consider that everything else stays unchanged, the dynamic-power-coefficient of LITTLE core should be only 53% of the current value: 290 * 53% = 154 Set the dynamic-power-coefficient of CPU0-3 to 154 to fix the energy model. [1] https://github.com/kdrag0n/freqbench/tree/master/results/sdm845/main Fixes: 0e0a8e35d725 ("arm64: dts: qcom: sdm845: correct dynamic power coefficients") Signed-off-by: Vincent Guittot Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20230106164618.1845281-1-vincent.guittot@linaro.org Signed-off-by: Sasha Levin --- arch/arm64/boot/dts/qcom/sdm845.dtsi | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi index f36c23e7a2248..ed525397d2335 100644 --- a/arch/arm64/boot/dts/qcom/sdm845.dtsi +++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi @@ -198,7 +198,7 @@ reg = <0x0 0x0>; enable-method = "psci"; capacity-dmips-mhz = <611>; - dynamic-power-coefficient = <290>; + dynamic-power-coefficient = <154>; qcom,freq-domain = <&cpufreq_hw 0>; operating-points-v2 = <&cpu0_opp_table>; interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_EBI1 3>, @@ -222,7 +222,7 @@ reg = <0x0 0x100>; enable-method = "psci"; capacity-dmips-mhz = <611>; - dynamic-power-coefficient = <290>; + dynamic-power-coefficient = <154>; qcom,freq-domain = <&cpufreq_hw 0>; operating-points-v2 = <&cpu0_opp_table>; interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_EBI1 3>, @@ -243,7 +243,7 @@ reg = <0x0 0x200>; enable-method = "psci"; capacity-dmips-mhz = <611>; - dynamic-power-coefficient = <290>; + dynamic-power-coefficient = <154>; qcom,freq-domain = <&cpufreq_hw 0>; operating-points-v2 = <&cpu0_opp_table>; interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_EBI1 3>, @@ -264,7 +264,7 @@ reg = <0x0 0x300>; enable-method = "psci"; capacity-dmips-mhz = <611>; - dynamic-power-coefficient = <290>; + dynamic-power-coefficient = <154>; qcom,freq-domain = <&cpufreq_hw 0>; operating-points-v2 = <&cpu0_opp_table>; interconnects = <&gladiator_noc MASTER_APPSS_PROC 3 &mem_noc SLAVE_EBI1 3>, -- 2.39.2