[Cake] Cake latency update

Pete Heist peteheist at gmail.com
Fri Feb 10 06:08:48 EST 2017

> On Feb 10, 2017, at 11:31 AM, Jonathan Morton <chromatix99 at gmail.com> wrote:
>> On 10 Feb, 2017, at 12:05, Pete Heist <peteheist at gmail.com> wrote:
>> It means that both the ingress and egress have been redirected over the same IFB device and QoS'd together.
> Okay, I guessed as much but wanted to be sure.
> I can’t think of any theoretical reason for these results.  Cake’s flow isolation should be robust enough to cope transparently with bidirectional traffic in half-duplex mode.  As you say, a C2D should easily be able to keep up, and at these modest rates I can even discount PCI bandwidth as a concern.  So I might need to try to reproduce it here.
> Does the problem go away if you use a wired link with the same setup otherwise?  Or is that inconvenient to try?  I have some ath9k equipped machines, but they would need to be set up.

Not a problem. I’ll run a spread of Cake and fq_codel over Ethernet at various bandwidths. It will be through their Apple USB Ethernet adapters (used now for management), which are also connected through a switch, but I think that setup should be fine for this purpose. Should be done in a hour or so and we’ll see…


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