Dave Taht <dave.taht@xxxxxxxxx> writes: > On Sat, Jan 7, 2023 at 10:08 AM team lnx <teamlnxi8@xxxxxxxxx> 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
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