[PATCH v3 1/3] eal: add lcore poll busyness telemetry

[Kevin Laatz]

On 29/08/2022 13:49, Morten Brørup wrote:
> From: Kevin Laatz [mailto:kevin.laatz at intel.com]
> Sent: Monday, 29 August 2022 14.37
>> The patches currently include runtime options to enable/disable the feature via API and via telemetry endpoints. We have run performance tests and have failed to measure any performance impact with the feature runtime disabled.
> Lots of features are added to DPDK all the time, and they all use the same "insignificant performance impact" argument. But the fact is, each added test-and-branch has some small performance impact (and consume some entries in the branch prediction table, which may impact performance elsewhere). If you add a million features using this argument, there will be a significant and measurable performance impact.
>
> Which is why I keep insisting on the ability to omit non-core features from DPDK at build time.

I think there's general consensus in having a buildtime option to 
disable it.

Do we agree that it should be buildtime enabled, and runtime disabled by 
default (so just the single additional branch by default), with the 
meson option available to disable it completely at buildtime?