Netvsc vs Failsafe Performance

[Stephen Hemminger]

On Tue, 3 Sep 2024 14:43:28 -0700
Nandini Rangaswamy <nandini.rangaswamy at broadcom.com> wrote:

> Hi Stephen and Long,
> I was going through one of the netvsc patches
> https://mails.dpdk.org/archives/dev/2018-August/110559.html which mentioned
> that netvsc and failsafe give the same performance in VF path whereas for
> some exception path  tests, about 22% performance gain in seen.
> I ran some tests locally with my dpdk app integrated with netvsc PMD and
> observed that netvsc does give nearly the same performance as failsafe in
> the VF path.
> Since the official document does not explicitly cite this, I would like to
> confirm if this holds good.
> Regards,
> Nandini
> 

Shouldn't be. What settings are you using.
Both failsafe and netvsc just pass packets to VF if present.
There is even more locks to go through with failsafe.

Are you sure the test doesn't exercise something like checksumming which
maybe different.