Re: [PATCH net-next] net: skbuff: Skip early return in skb_unref when debugging

[Eric Dumazet]

On Tue, Jul 30, 2024 at 4:10 PM Jakub Kicinski <kuba@xxxxxxxxxx> wrote:
>
> On Tue, 30 Jul 2024 13:15:57 +0200 Paolo Abeni wrote:
> > > If thats the case why does it exist at all?
>
> +1
>
> > > I was under impression that entire reason for CONFIG_DEBUG_NET was
> > > to enable more checks for fuzzers and the like, i.e. NOT for production
> > > kernels.
> >
> > I feel like I already had this discussion and I forgot the outcome, if
> > so I'm sorry. To me the "but is safe to select." part in the knob
> > description means this could be enabled in production, and AFAICS the
> > CONFIG_DEBUG_NET-enabled code so far respects that assumption.
>
> I believe the previous discussion was page pool specific and there
> wasn't as much of a conclusion as an acquiescence (read: we had more
> important things on our minds than that argument ;)).
>
> Should we set a bar for how much perf impact is okay?
>
> FTR I suspect there will be no measurable perf impact here.

Same feeling here, I think this patch is fine really.

Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>