Re: DPDK and energy efficiency

[Pawel Malachowski <pawmal-nanog () freebsd lublin pl>]

Dnia Mon, Feb 22, 2021 at 12:45:52PM +0100, Etienne-Victor Depasquale napisał(a):

> 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%.

No, it is not PMD that runs the processor in a polling loop.
It is the application itself, thay may or may not busy loop,
depending on application programmers choice.


-- 
Pawel Malachowski
@pawmal80