Netflix stuffing data on pipe

Josh Reynolds josh at
Wed Dec 30 08:22:09 UTC 2015

It's a long and ugly story...

1Gbps FD feeds -> switch -> 100Mbps FD radio port -> fluctuating PHY rate
Half Duplex wireless link/CPE (shaped here).

Netflix is microbusting, and its really nasty on his kind of network,
especially with the shaping being toward the end of his network.
On Dec 30, 2015 1:59 AM, "Hugo Slabbert" <hugo at> wrote:

> On Tue 2015-Dec-29 21:17:51 -0600, Josh Reynolds <josh at>
> wrote:
> The second part. Fixed wireless is not even on their radar.
>> On Dec 29, 2015 9:16 PM, "Matt Hoppes" <mhoppes at>
>> wrote:
>> So they are trying to stuff every last bit as an end device modulates up
>>> and down?
>>> Or are you saying that's how they determine if they can scale up the
>>> resolution "because there is more throughout available now".
>>> On Dec 29, 2015, at 22:10, Josh Reynolds <josh at> wrote:
>>> Adaptive bandwidth detection.
>>> On Dec 29, 2015 8:59 PM, "Matt Hoppes" <mhoppes at>
>>> wrote:
>>> Has anyone else observed Netflix sessions attempting to come into
>>>> customer CPE devices at well in excess of the customers throttled plan?
>>>> I'm not talking error retries on the line. I'm talking like two to three
>>>> times in excess of what the customers CPE device can handle.
>>>> I'm observing massive buffer overruns in some of our switches that
>>>> appear
>>>> to be directly related to this. And I can't figure out what possible
>>>> good
>>>> purpose Netflix would have for attempting to do this.
> Pardon my ignorance of WISP-specific bits here, but how are they supposed
> to know to back off on their bitrate ramp-up if you keep buffering rather
> than dropping packets when the TX rate exceeds the customer's service
> rate?  Or what am I missing?
> Curious if anyone else has seen it?
> --
> Hugo
> hugo at email, xmpp/jabber
> PGP fingerprint (B178313E):
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> (also on Signal)

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