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

[Neftin, Sasha]

On 4/7/2022 18:58, Paul Menzel wrote:
> 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.The power consumption during normal operation mode expected to be ~600mW.
> 
> 
> Kind regards,
> 
> Paull