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

["Neftin, Sasha" <sasha.neftin@intel.com>]

On 1/19/2023 16:15, Paul Menzel wrote:
> Dear Sasha,
> 
> 
> Am 14.04.22 um 09:07 schrieb Neftin, Sasha:
>> On 4/7/2022 18:58, Paul Menzel wrote:
> 
>>> 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.
> 
> With Linux 6.1.4 I still see high power usage:
> 
>        4.01 W     26,0 pkts/s                Device 
> Netzwerkschnittstelle: eno1 (e1000e)
> 
> Disconnecting the cable, it still shows high usage:
> 
>        5.34 W      0,0 pkts/s                Device 
> Netzwerkschnittstelle: eno1 (e1000e)
> 
> Were you able to reproduce it on your test systems?
I  didn't reproduce.
I do not know if we can trust the powertop tool. (LAN power consumption 
could be measured via a resistor on the controller connection lanes.)
Did you contact your vendors regards this problem?
> 
> 
> Kind regards,
> 
> Paul

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