From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 64C34A0C52; Wed, 24 Nov 2021 18:10:05 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 0F1F840696; Wed, 24 Nov 2021 18:10:05 +0100 (CET) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by mails.dpdk.org (Postfix) with ESMTP id 19B4740688 for ; Wed, 24 Nov 2021 18:10:02 +0100 (CET) X-IronPort-AV: E=McAfee;i="6200,9189,10178"; a="235271325" X-IronPort-AV: E=Sophos;i="5.87,260,1631602800"; d="scan'208";a="235271325" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Nov 2021 08:53:14 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.87,260,1631602800"; d="scan'208";a="650455124" Received: from silpixa00399952.ir.intel.com ([10.55.129.13]) by fmsmga001.fm.intel.com with ESMTP; 24 Nov 2021 08:53:12 -0800 From: David Hunt To: dev@dpdk.org Cc: david.hunt@intel.com Subject: [PATCH] doc/power: add info on scale mode reaction time Date: Wed, 24 Nov 2021 16:53:00 +0000 Message-Id: <20211124165300.31165-1-david.hunt@intel.com> X-Mailer: git-send-email 2.17.1 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org When using PMD Power Management, scale mode reacts slower than monitor mode and pause mode. Add note in user guide to this effect. Signed-off-by: David Hunt --- doc/guides/prog_guide/power_man.rst | 4 +++- doc/guides/sample_app_ug/l3_forward_power_man.rst | 5 +++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/doc/guides/prog_guide/power_man.rst b/doc/guides/prog_guide/power_man.rst index e387d7811e..66592cf22f 100644 --- a/doc/guides/prog_guide/power_man.rst +++ b/doc/guides/prog_guide/power_man.rst @@ -216,7 +216,9 @@ power saving whenever empty poll count reaches a certain number. * Frequency scaling This power saving scheme will use ``librte_power`` library functionality to - scale the core frequency up/down depending on traffic volume. + scale the core frequency up/down depending on traffic volume. The reaction + time of the frequency scaling mode is longer than the pause and monitor + mode. The "monitor" mode is only supported in the following configurations and scenarios: diff --git a/doc/guides/sample_app_ug/l3_forward_power_man.rst b/doc/guides/sample_app_ug/l3_forward_power_man.rst index 8817eaadbf..84b014fab5 100644 --- a/doc/guides/sample_app_ug/l3_forward_power_man.rst +++ b/doc/guides/sample_app_ug/l3_forward_power_man.rst @@ -345,8 +345,9 @@ and has three available power management schemes: to avoid busy looping when there is no traffic. ``scale`` - This will use frequency scaling routines - available in the ``librte_power`` library. + This will use frequency scaling routines available in + the ``librte_power`` library. The reaction time of the + scale mode is longer than the pause and monitor mode. See :doc:`Power Management<../prog_guide/power_man>` chapter in the DPDK Programmer's Guide for more details on PMD power management. -- 2.17.1