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

[Toke Høiland-Jørgensen]

Priority field sets tin, class sets flow. Both need the qdisc is as its major number, iirc. And both can be set from the same bpf filter which can be run in direct action mode...

-Toke

On 28 July 2018 19:56:35 CEST, Dave Taht <dave.taht at gmail.com> wrote:
>https://github.com/iovisor/bcc/blob/master/src/cc/compat/linux/bpf.h#L2222
>says you can get at the priority field.
>
>On Sat, Jul 28, 2018 at 10:52 AM Dave Taht <dave.taht at gmail.com> wrote:
>>
>> On Sat, Jul 28, 2018 at 10:38 AM Pete Heist <pete at heistp.net> wrote:
>> >
>> >
>> > On Jul 28, 2018, at 10:56 AM, Toke Høiland-Jørgensen <toke at toke.dk>
>wrote:
>> >
>> > Note that with the existing tc classifier stuff we already added to
>> > Cake, we basically have this already (eBPF can map traffic to tin
>and
>> > flow however it pleases).
>> >
>> >
>> > Sorry, this just jostled in my brain now that I may be able to
>implement member fairness today, based on what you wrote earlier in a
>thread that I entirely missed:
>https://lists.bufferbloat.net/pipermail/cake/2018-May/003811.html
>> >
>> > George posted an example of assigning packets to a tin:
>https://lists.bufferbloat.net/pipermail/cake/2018-May/003809.html
>> >
>> > How does one send packets to a specific flow / queue?
>>
>> It's essentially above. I think you can actually do it in pure bpf
>> without skbedit, I'd written a tc bpf flow classifier for acks quite
>> some time ago. The not current version is attached. I really need to
>> finish up some ack related stuff.
>> Using a bpf map to this then setting the flowid directly?
>>
>>
>> > This wouldn’t give both per-member and per-flow fairness, but at
>least per-member fairness might be possible. There are 1024(?) queues
>available and 800 members, so I’m just speculating that I could map
>members to a number from 0 to 800 (active member IDs packed and
>zero-based would work) and assign each member to their own flow.
>Thanks... :)
>> >
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>>
>>
>> --
>>
>> Dave Täht
>> CEO, TekLibre, LLC
>> http://www.teklibre.com
>> Tel: 1-669-226-2619