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=-2.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT 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 A0A80C18DF5 for ; Tue, 20 Nov 2018 14:46:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3D7A9206B2 for ; Tue, 20 Nov 2018 14:46:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=lunn.ch header.i=@lunn.ch header.b="ALZTnMuO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3D7A9206B2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lunn.ch 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 S1727811AbeKUBPj (ORCPT ); Tue, 20 Nov 2018 20:15:39 -0500 Received: from vps0.lunn.ch ([185.16.172.187]:41963 "EHLO vps0.lunn.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727132AbeKUBPj (ORCPT ); Tue, 20 Nov 2018 20:15:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lunn.ch; s=20171124; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date; bh=9lR4cogK+Ei+KDeMH+b3zV9BFPcOlBnKY8bBJ7VLpDE=; b=ALZTnMuOl1tTtX1/SIbjeBVe/GWgijNs2aq23KMUauEquCe8KkXbsZaPyYJqSCmbLAR1JP2S3IxIvahAnRdoojspigLXh32dRASARgVJpTcoIIsR3gQeDn3WnbquH9ga2iMbnIOONcBds1aEZTDB6eAsBY/qXILSVtVsYAqDox0=; Received: from andrew by vps0.lunn.ch with local (Exim 4.84_2) (envelope-from ) id 1gP7Ho-00070y-BN; Tue, 20 Nov 2018 15:45:56 +0100 Date: Tue, 20 Nov 2018 15:45:56 +0100 From: Andrew Lunn To: Paul Menzel Cc: Realtek linux nic maintainers , "David S. Miller" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Heiner Kallweit Subject: Re: Realtek NIC uses over 1 Watt with no traffic Message-ID: <20181120144556.GC18335@lunn.ch> References: <081beaeb-be22-55b3-2927-fec04e9f714a@molgen.mpg.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <081beaeb-be22-55b3-2927-fec04e9f714a@molgen.mpg.de> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 20, 2018 at 09:40:25AM +0100, Paul Menzel wrote: > 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? Hi Paul This sounds like Energy Efficient Ethernet, EEE, is not enabled. What does ethtool --show-eee ethX say? Andrew