[Intel-wired-lan] I218-LM uses > 1 W with low traffic

[Paul Menzel]

Dear Sasha,


Am 07.04.22 um 13:03 schrieb Neftin, Sasha:
> On 4/6/2022 13:09, Paul Menzel wrote:

>> On a Dell Latitude E7250 with Debian sid/unstable, PowerTOP 2.14 
>> reports the network device uses over 1.5 Watt, which is almost ten 
>> percent of the whole system.
>>
>>        1.62 W    435,9 pkts/s                Device Netzwerkschnittstelle: eno1 (e1000e)
>>
>>      $ lspci -nn | grep Ether
>>      00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection (3) I218-LM [8086:15a2] (rev 03)
>>      $ uname -a
>>      Linux ersatz 5.17.0-trunk-amd64 #1 SMP PREEMPT Debian 5.17.1-1~exp1 (2022-03-29) x86_64 GNU/Linux
>>
>>  From atop:
>>
>>      NET |  eno1      0% |  pcki    2421 |  pcko    2194 |  sp 1000 Mbps |  si 1501 Kbps  | so  140 Kbps  | erri       0  | erro       0  | drpo       0  |
>>
>> So I receive 1.5 Mbps, and send 0.14 Mbps.
>>
>> Is such high energy usage expected of the network hardware?

> It is not the power consumption we expected.How do you measure it? (as I 
> know powertop does not show it)

On my system, PowerTOP shows it. Though maybe it’s a bug in PowerTOP’s 
power usage estimation algorithm. No idea. At least with no network 
cable connected, it shows zero Watts being used.

         0 mW      0,0 pkts/s  Netzwerkschnittstelle: eno1 (e1000e)


> We will try to find out about power consumption.

Thank you very much.


Kind regards,

Paull