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Date: Tue, 20 Nov 2018 09:40:25 +0100 From: Paul Menzel <pmenzel@...gen.mpg.de> To: Realtek linux nic maintainers <nic_swsd@...ltek.com> Cc: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Realtek NIC uses over 1 Watt with no traffic 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
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