[Bloat] [Make-wifi-fast] benefits of ack filtering

Robert Bradley robert.bradley1 at gmail.com
Sun Dec 3 10:25:44 EST 2017

On 03/12/2017 13:57, Juliusz Chroboczek wrote:
> A TCP Ack is 40 bytes.  A data packet is up to 1500 bytes.
> As far as I know, DOCSIS has an asymmetry factor that is between 4 and 10,
> depending on the deployment.  With worst case asymmetry being 10, this
> means that you can send an Ack for every data packet with 400 byte data
> packets, every second data packet with 200 byte data packets.  If the
> asymmetry is a more reasonable 4, then the figures are 100 and 50
> respectively.

I currently have 230 Mb/s down to 12.7 Mb/s up, so about an 18:1 ratio.
That's roughly an ACK for every 750 byte packet.

Robert Bradley

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