linux-kernel - Re: Realtek NIC uses over 1 Watt with no traffic

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Message-ID: <20181120144556.GC18335@lunn.ch>
Date:   Tue, 20 Nov 2018 15:45:56 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: Realtek NIC uses over 1 Watt with no traffic

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