[Bloat] [aqm] ping loss "considered harmful"

Mikael Abrahamsson swmike at swm.pp.se
Wed Mar 4 03:12:02 EST 2015

On Mon, 2 Mar 2015, Dave Taht wrote:

> I note that there are conflicting definitions of CS1 (background). 
> Comcast, re-marks about 90% I see to CS1 from whatever it was 
> originally, in the hope that it is treated as background. The ancient 
> firmware in commercial home routers *prioritizes* CS1 on etheret and 
> *deprioritizes it* on wifi, into the 802.11e background queue, when 
> enabled. CeroWrt tries to cons

This is the default I have seen in quite a few 4 queue L2 devices, I 
believe it comes from IEEE recommendations:


     Product           802.1p Priority/CoS    Transmit Queue

Matrix N; non-Policy Priority, 'show port priority-queue'
  -4 or 8 queues-              0      4&8 Qs-> 1
     Fast Ethernet ports       1               0
                               2               0
                               3               1
                               4               2
                               5               2
                               6               3
                               7               3

Since a lot of products will mark IP PREC part of TOS directly into .1p 
bits, this means CS0 and CS3 goes into higher priority queues compared to 
CS1 and CS2.

seems to indicate HP does the same.

says the same.

However, I find devices that do differently by default as you have already 

Mikael Abrahamsson    email: swmike at swm.pp.se

More information about the Bloat mailing list