[Cerowrt-devel] [Bloat] Comcast upped service levels -> WNDR3800 can't cope...

[Jonathan Morton]

On 30 Aug, 2014, at 8:33 pm, Jonathan Morton wrote:

> I'll need to investigate more closely to see whether there's a CPU load difference between HTB and TBF in practice.

Replying to myself, but...

The surprising result is that TBF seems to consume about TWICE the CPU time, at the same bandwidth, as HTB does.  Even FQ in flow-rate-limit mode is roughly on par with HTB on that score.  There is clearly something very wrong with how TBF is doing it.

HTB (running with only a default class) and FQ are both able to send and regulate 200Mbps using about an eighth of a 1.5GHz PowerPC, all told.  It doesn't even seem to matter which qdisc I slap on top of HTB.  TBF needs almost a quarter of the same CPU to do the same thing.

 - Jonathan Morton