It sounds like the problem is the broadcom chipset (earlier versions of)
combined with airdrop using the chipset to talk on two channels at the same
time,
which destroys wifi throughput. and not much to do with buffer bloat.
At least that is the TL;DR of a long article posted in the comments.

On Tue, May 5, 2015 at 4:50 PM, Dave Taht <dave.taht@gmail.com> wrote:

> http://garrett.damore.org/2015/05/macos-x-10103-update-is-toxic.html
>
> Jeeze, rich has been busy lately....
>
> --
> Dave Täht
> Open Networking needs **Open Source Hardware**
>
> https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67
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