On Tue, Oct 19, 2021 at 6:34 AM Sebastian Moeller <moell...@gmx.de> wrote: > > So that still leaves us with GSO introducing CE "spikes" into the network, > that might not necessarily reflect what would happened if the meta-packet had > been segmented before....
I am not sure the proper term for this, the "wavefront" of a GSO'd packet will get scheduled and not marked, and the tail of the wave, were it not GSO'd, might be marked. The next wavefront, assuming it's accumulated a negative deficit, will all be marked. Now what this means for the next "wavefront" I don't really understand, my guess is packets will start to get paced naturally from the sender but might still be arriving in a bunch to the receiver. On the GRO side, I am glad toke has reassured me that at least in linux, GRO checks all the headers. as for what hardware offloads or the device drivers might do, unknown. In our world we've been splitting up gro/gso in self defense so much that we don't know what the rest of the world looks like. sch_fq has a 3000 byte quantum and always releases two packets by default. > I note that rfc3168 probably will not care, since it will signal a CE mark > for >= a full RTT anyway, but HFCCs will care. I have long thought that responding better to multiple rfc3168 marks in an RTT would be a nice addition for a transport to have. But, no, they don't care. > Regards > Sebastian > > > > > On Oct 19, 2021, at 15:30, Dave Taht <dave.t...@gmail.com> wrote: > > > > On Tue, Oct 19, 2021 at 4:19 AM Toke Høiland-Jørgensen <t...@toke.dk> wrote: > >> > >> Dave Taht <dave.t...@gmail.com> writes: > >> > >>> my more specific question was gro. On gro assembly is the dscp/ecn > >>> header examined? > >> > >> Yes, and only packets with the same value get aggregated: > >> https://elixir.bootlin.com/linux/latest/source/net/ipv6/ip6_offload.c#L263 > > > > Good to know. Thx. > > > >> -Toke > > > > > > > > -- > > Fixing Starlink's Latencies: https://www.youtube.com/watch?v=c9gLo6Xrwgw > > > > Dave Täht CEO, TekLibre, LLC > -- Fixing Starlink's Latencies: https://www.youtube.com/watch?v=c9gLo6Xrwgw Dave Täht CEO, TekLibre, LLC _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake
