Re: Pause and unpause queue

Thanks Toke and Dave for the response with explanation and knowledge
which explains that its work in progress !!

Thanks !

On Sat, Jan 7, 2023 at 10:49 AM Toke Høiland-Jørgensen <[email protected]> wrote:
>
> Dave Taht <[email protected]> writes:
>
> > On Sat, Jan 7, 2023 at 10:08 AM team lnx <[email protected]> wrote:
> >>
> >> sure, during xdp redirect i found that sometimes the number of packets
> >> arrived are too many for an interface
> >
> > That is often the case.
> >
> >> to handle in which case. Hence thought to experiment with tx pause to
> >> make room for successive packets and then unpause !
> >
> > "pauses" are really not how the internet works, there needs to be end
> > to end signalling to "slow down", either via packet loss, or marking.
> > RFC970 is a good read here.
>
> Actually it is, kinda, at this level: Pausing the TX interface (when the
> HWQ is full) is how the regular network stack creates backpressure
> against the qdisc, which is what allows fq_codel and friends to
> function. This is missing entirely from the XDP redirect path, which is
> what we're trying to fix...
>
> -Toke
>