[Cake] Using cake to shape 1000’s of users.

Pete Heist pete at heistp.net
Mon Jul 30 18:10:49 EDT 2018

> On Jul 30, 2018, at 1:28 PM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> Pete Heist <pete at heistp.net> writes:
>> Couldn’t it still be made so now? Not sure of the performance impact
>> though.
> It could, but it would take some care. There's the issue of
> power-of-two-ness and avoiding divides that Jonathan pointed out, and
> the memory allocation would be complicated somewhat. Certainly doable,
> but I'm not sure it's worth it for its own sake if the plan is to build
> a new qdisc anyway...

Fair enough, we’ll see.

The challenge now is eBPF classification doesn’t look like it will be usable on 3.16 (on FreeNet's routers). Maps weren’t introduced until 3.18 and tc support in 4.1. I’ll see what upgrades are possible.

Also, if ISP Cake is a new qdisc, I don’t see now why it would need to support kernel versions where scalable classification by IP or MAC isn’t practical to do. The hard lower limit seems like 4.1, but also direct-action mode in 4.4 would be good for performance, and without the LPM trie in 4.11, classification by subnet would be more difficult...


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