DPDK and energy efficiency

Mon Feb 22 11:45:52 UTC 2021

>
> The way I saw, the questions induce the public to conclude that DPDK
> ALWAYS has 100% CPU usage, which is not true.

I don't concur.

Every research paper I've read indicates that, regardless of whether it has
packets to process or not, DPDK PMDs (poll-mode drivers) prevent the CPU
from falling into an LPI (low-power idle).

When it has no packets to process, the PMD runs the processor in a polling
loop that keeps utilization of the running core at 100%.

Cheers,

Etienne

On Mon, Feb 22, 2021 at 12:33 PM Douglas Fischer <fischerdouglas at gmail.com>
wrote:

> I'm very happy to see interest in DPDK and power consumption.
>
> But IMHO, the questions do not cover the actual reality of DPDK.
> That característic of "100% CPU" depends on several aspects, like:
>  - How old are the hardware on DPDK.
>  - What type of DPDK Instructions are made(Very Dynamic as
> Statefull CGNAT, ou Static ACLs?)
>  - Using or not the measurements of DPDK Input/Drop/Fowarding.
>  - CPU Affinity done according to the demand of traffic
>  - SR-IOV (sharing resources) on DPDK.
>
> The way I saw, the questions induce the public to conclude that DPDK
> ALWAYS has 100% CPU usage, which is not true.
>
>
> Em seg., 22 de fev. de 2021 às 04:30, Etienne-Victor Depasquale <
> edepa at ieee.org> escreveu:
>
>> Hello folks,
>>
>> I've just followed a thread regarding use of CGNAT and noted a suggestion
>> (regarding DANOS) that includes use of DPDK.
>>
>> As I'm interested in the breadth of adoption of DPDK, and as I'm a
>> researcher into energy and power efficiency, I'd love to hear your feedback
>> on your use of power consumption control by DPDK.
>>
>> I've drawn up a bare-bones, 2-question survey at this link:
>>
>> https://www.surveymonkey.com/r/J886DPY.
>>
>> Responses have been set to anonymous.
>>
>> Cheers,
>>
>> Etienne
>>
>> --
>> Ing. Etienne-Victor Depasquale
>> Assistant Lecturer
>> Department of Communications & Computer Engineering
>> Faculty of Information & Communication Technology
>> University of Malta
>> Web. https://www.um.edu.mt/profile/etiennedepasquale
>>
>
>
> --
> Douglas Fernando Fischer
> Engº de Controle e Automação
>

-- 
Ing. Etienne-Victor Depasquale
Assistant Lecturer
Department of Communications & Computer Engineering
Faculty of Information & Communication Technology
University of Malta
Web. https://www.um.edu.mt/profile/etiennedepasquale
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