[Make-wifi-fast] On the 802.11 performance anomaly and an airtime fairness scheduler to fix it

Luca Muscariello luca.muscariello at gmail.com
Sun Jul 3 03:53:52 EDT 2016


The paper I mentioned.
Usenix ATC'14 not NSDI.

On Sunday, 3 July 2016, Jonathan Morton <chromatix99 at gmail.com> wrote:

> > On 3 Jul, 2016, at 10:06, David Lang <david at lang.hm <javascript:;>>
> wrote:
> >
> > do they delay the L2 Ack until the L4 ack comes back? If so, how does
> that work on long-latency connections where it takes a long time for the L4
> ack to show up?
> I’m pretty sure it’s only meant to work when the TCP endpoint is local to
> the receiving station, assuring low turnaround latency.  This is the
> typical case, so it’s a win.
> With that said, there’s no fundamental reason why the piggybacked L4 ack
> need be the one corresponding to the L2 ack.  It just needs to be a small
> packet that won’t unduly extend the airtime occupied by the ack anyway, and
> which won’t mind being lost if the L2 ack gets squashed.  A scheme allowing
> a certain amount of slop in this way would accommodate remote TCP endpoints
> as well as local ones.
>  - Jonathan Morton
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