[Cake] Getting Cake to work better with Steam and similar applications

[Andy Furniss]

Andy Furniss wrote:

>> My understanding is again that on pppoe devices the kernel adds zero
>> bytes auto matically and attaching the ifb does not seem to change
>> that?
> 
> The packet size is ip length as seen by cake on ifb redirected from
> pppoe - but this time it seems the difference is 14 not 22 ...

To be clear below is redirecting ingress qdisc on ppp0 to ifb0.

> 
> tc qdisc add dev ifb0 handle 1:0 root cake bandwidth 60mbit raw overhead 
> 34 diffserv4 nat dual-dsthost
> 
> asr[/home/andy]# tc -s qdisc ls dev ifb0
> qdisc cake 1: root refcnt 2 bandwidth 60Mbit diffserv4 dual-dsthost nat 
> rtt 100.0ms noatm overhead 48 via-ethernet
>   Sent 14315263754 bytes 12978554 pkt (dropped 51315, overlimits 
> 18015371 requeues 0)
>   backlog 0b 0p requeues 0
>   memory used: 1006656b of 4Mb
>   capacity estimate: 60Mbit
>                   Bulk   Best Effort      Video       Voice
>    thresh      3750Kbit      60Mbit      30Mbit      15Mbit
>    target         5.0ms       5.0ms       5.0ms       5.0ms
>    interval     100.0ms     100.0ms     100.0ms     100.0ms
>    pk_delay       243us       1.2ms        42us        82us
>    av_delay        18us       821us         7us         8us
>    sp_delay         2us         3us         4us         3us
>    pkts         1942903    10462709      272777      351480
>    bytes      130598812 14085111253     8318580   168132633
>    way_inds         220       46306           0           0
>    way_miss       68580      114792         188       84890
>    way_cols           0           0           0           0
>    drops              0       51308           0           7
>    marks              0           0           0           0
>    sp_flows           0           0           1           0
>    bk_flows           0           0           0           0
>    un_flows           0           0           0           0
>    max_len         1500        1500        1500        1441