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

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Date:   Tue, 20 Nov 2018 21:20:07 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Andrew Lunn <andrew@...n.ch>
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

Dear Andrew,


Am 20.11.18 um 15:45 schrieb Andrew Lunn:
> On Tue, Nov 20, 2018 at 09:40:25AM +0100, Paul Menzel wrote:

>> 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?

> This sounds like Energy Efficient Ethernet, EEE, is not enabled.

No, idea if the router from my provider supports that.

> What does ethtool --show-eee ethX say?

     $ sudo ethtool --show-eee enp3s0f1
     Cannot get EEE settings: Operation not supported


Kind regards,

Paul