On Sun, 2021-06-06 at 21:59 +0200, Toke Høiland-Jørgensen wrote: > Pete Heist <p...@heistp.net> writes: > > > I've always wanted a way to customize Cake's host and flow isolation > > in > > a way that would be usable e.g. for small ISPs, and this is what I > > came > > up with: > > > > https://github.com/heistp/cake-custom-isolation > > > > ipsets are used to set the skb priority or mark, then tc-flow or a > > simple eBPF classifier is used in a child filter of cake to get the > > major and minor class IDs set, which override the host and flow > > hashes. > > Very cool! Awesome to see the customisation options being used for > something neat like this! :) > > > To show it in action, the cakeiso.sh script sets up a netns > > environment > > and runs competition between two "subscribers" and three flows, two > > TCP > > flows and one unresponsive UDP flow. Several configurations are run > > to > > show what is and isn't possible. > > > > If anyone knows of a simpler way than eBPF to get both the major and > > minor class ID set from ipsets, I'd like to hear it, but the included > > classifiers are at least very simple one-liners... > > Well, you could go the other way? Instead of ipset, just do the > classification in eBPF and use a BPF map to store the IP addresses. > There's even an LPM map type, so you can use arbitrary prefix lengths > for each class (or not, and just use a hashmap)...
True that, I started something like that at some point: https://github.com/heistp/tc-users/ but I think I got a little overzealous with it. I'm not sure if/when I'll get back to that, but the ipset solution seems to be "good enough" for what I (and my ISP) needs. I'm glad you slipped the tc filter overrides in before Cake went out the door. :) This doesn't do away with the possible need for a full-blown ISP qdisc one day, with configurable subscriber tiers, handling of higher loads, etc, but at least it's something for the little guys. Pete > -Toke _______________________________________________ Cake mailing list Cake@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cake