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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 6E429C433E2 for ; Mon, 18 May 2020 11:00:10 +0000 (UTC) Received: from dpdk.org (dpdk.org [92.243.14.124]) by mail.kernel.org (Postfix) with ESMTP id 373B720709 for ; Mon, 18 May 2020 11:00:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 373B720709 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=dev-bounces@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 378BF1D506; Mon, 18 May 2020 13:00:05 +0200 (CEST) Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by dpdk.org (Postfix) with ESMTP id 296131D44E for ; Mon, 18 May 2020 13:00:02 +0200 (CEST) IronPort-SDR: hvjAvAjH8nfq3obXhbQwIYZyxZrfJ3XHoF+IWCiPOkDhuCcm41V9CUTCFLQqukuT3PCi3WU+lq KMIxg9RTFXNg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2020 04:00:02 -0700 IronPort-SDR: m1qX0M4pyx83E5sQuGWTQfGLu39+yQudSTv7H7WO5dU+r/a0Dxbf3YcV29gzQzA6IBC1pb61ja 2rhhv4xmVkuw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,407,1583222400"; d="scan'208";a="439173073" Received: from silpixa00399913.ir.intel.com (HELO silpixa00399913.ger.corp.intel.com) ([10.237.222.230]) by orsmga005.jf.intel.com with ESMTP; 18 May 2020 04:00:01 -0700 From: "Sexton, Rory" To: dev@dpdk.org, david.hunt@intel.com Cc: "Sexton, Rory" Date: Mon, 18 May 2020 11:39:01 +0100 Message-Id: <20200518103902.27927-2-rory.sexton@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200518103902.27927-1-rory.sexton@intel.com> References: <20200518103902.27927-1-rory.sexton@intel.com> Subject: [dpdk-dev] [PATCH v2 2/3] examples/vm_power_manager: Allowing power managing of idle cores X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" This change is required to allow the branch ratio algorithm to power manage cores with no workload running on them. This is useful both when idle cores don't use C-states and for a number of hyperthreading scenarios. Signed-off-by: Rory Sexton --- examples/vm_power_manager/oob_monitor_x86.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/examples/vm_power_manager/oob_monitor_x86.c b/examples/vm_power_manager/oob_monitor_x86.c index 3c514475f..a5b1c168c 100644 --- a/examples/vm_power_manager/oob_monitor_x86.c +++ b/examples/vm_power_manager/oob_monitor_x86.c @@ -96,12 +96,12 @@ apply_policy(int core) g_branch_misses = miss_diff; if (hits_diff < (INTERVAL*100)) { - /* Likely no workload running on this core. Skip. */ - return -1.0; + /* Likely no workload running on this core. */ + ratio = 0.0; + } else { + ratio = (float)miss_diff * (float)100 / (float)hits_diff; } - ratio = (float)miss_diff * (float)100 / (float)hits_diff; - /* * Store the last few directions that the ratio indicates * we should take. If there's on 'up', then we scale up -- 2.17.1