[Cake] cake at 60gbit

[Pete Heist]

> On Jul 3, 2018, at 12:23 AM, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
> 
> My hunch is that this has something to do with the way mlx5 uses multiple receive queues (and thus multiple CPUs). Which is probably different from veth...

It doesn’t reproduce between between 2x APU2c4 (4 hardware queues and igb driver w/ mq support), but that’s 1Gbit, plus this Mellanox thing appears to have all sorts of hardware whatnots if this is the right device:

http://www.mellanox.com/related-docs/prod_silicon/PB_ConnectX-4_EN_IC.pdf

I noticed it has support for some link-layer congestion notification I’d not heard of until now (802.1Qau, https://www.ietf.org/proceedings/67/slides/tsvarea-2.pdf).