On Tue, Nov 23, 2021 at 2:39 AM Toke Høiland-Jørgensen <t...@toke.dk> wrote: > > Sebastian Moeller <moell...@gmx.de> writes: > > > Hi Dave, > > > > On 23 November 2021 08:32:06 CET, Dave Taht <dave.t...@gmail.com> wrote: > >>The context of my question is basically this: > >> > >>Is cake baked? Is it done? > > > > How about per MAC address fairness (useful for ISPs and to treat > > IPv4/6 equally)? > > > > How about configurable number of queues (again helpful for ISPs)? > > FWIW I don't think CAKE is the right thing for ISPs, except in a > deployment where there's a single CAKE instance per customer. For > anything else (i.e., a single shaper that handles multiple customers), > you really need hierarchical policy enforcement like in a traditional > HTB configuration. And retrofitting this on top of CAKE is going to > conflict with the existing functionality, so it probably has to be a > separate qdisc anyway.
What progress has been made on breaking the HTB locks in the last few years? Given the enormous number of hw tx/rx queues we see today (64+ on 10gbit), trying to charge off bandwidth per queue in a cake-derived shaper and protecting the merge with rcu seemed plausible... > > > IMHO cake works pretty well, with the biggest issue being its CPU > > demands. As far as I understand however, that is caused by the shaper > > component and there low latency and throughput are in direct > > competition, if we want to lower the CPU latency demands we need to > > allow for bigger buffers that keep the link busy even if cake itself > > is not scheduled as precisely as we would desire or as e.g. BQL > > requires. > > Yes, as link speed increases, batching needs to increase to keep up. > This does not *have* to impact latency, as the faster link should keep > the granularity constant in the time domain. So experimenting with doing > this dynamically in CAKE might be worthwhile, but probably not trivial. > > And either way, CAKE is still going to be limited by being single core > only, and fixing that requires some serious surgery that I seem to > recall looking into and giving up at some point :( It was so long ago I don't remember what other issues came up at the time. ? I am seeing nvidia offloading red and htb. > -Toke -- I tried to build a better future, a few times: https://wayforward.archive.org/?site=https%3A%2F%2Fwww.icei.org Dave Täht CEO, TekLibre, LLC _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake
