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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 5BDE8C43610 for ; Tue, 20 Nov 2018 08:41:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3CC9420851 for ; Tue, 20 Nov 2018 08:40:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3CC9420851 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=molgen.mpg.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726540AbeKTTIZ (ORCPT ); Tue, 20 Nov 2018 14:08:25 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:57615 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725912AbeKTTIZ (ORCPT ); Tue, 20 Nov 2018 14:08:25 -0500 Received: from [192.168.0.2] (ip5f5bf24c.dynamic.kabel-deutschland.de [95.91.242.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id F30432012BAC0D; Tue, 20 Nov 2018 09:40:25 +0100 (CET) To: Realtek linux nic maintainers Cc: "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org From: Paul Menzel Subject: Realtek NIC uses over 1 Watt with no traffic Message-ID: <081beaeb-be22-55b3-2927-fec04e9f714a@molgen.mpg.de> Date: Tue, 20 Nov 2018 09:40:25 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dear Linux folks, Using Ubuntu 18.10, Linux 4.18.0-11-generic, PowerTOP 2.9 shows, the NIC uses 1.77 Watts. A network cable is plugged in, but there is no real traffic according to `iftop`. Only an email program is running. $ lspci -nn -s 3:00.1 03:00.1 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 12) Is that a measurement error, or does the NIC really need that much power? > Der Akku meldet eine Entladungsrate von 10.2 W > Der verbrauchte Strom ist: 0.00 J > Grundsätzlich benötigte Energie wird auf 10.5 W geschätzt > > Energieschätz. Auslastung Gerätename > 7.03 W 4,9% Display backlight > 1.77 W 0,0 pkts/s Netzwerkschnittstelle: enp3s0f1(r8169) Letting it run for a while, the value even grows to 3.5 Watts, but closing and starting PowerTOP, it goes back to 1.7X Watts. Kind regards, Paul