[Cerowrt-devel] BBR congestion control algorithm for TCP in net-next

Mikael Abrahamsson swmike at swm.pp.se
Wed Sep 21 07:32:45 EDT 2016

On Wed, 21 Sep 2016, Dave Taht wrote:

> I did a fairly comprehensive string of tests today, comparing it at 
> 20Mbits, 48ms RTT, to cubic and competing with cubic, against a byte 
> fifo of 256k, pie, cake, cake flowblind, and fq_codel.

20 megabit/s is 2.5 megabyte/s, so that 256k FIFO is only 100ms worth of 
buffering. I guess you see packet drop in steady state here, ie buffer is 

I'd be interested in seeing same experiment start with 10MB FIFO, and 
having CUBIC flow start first and give it proper head start.

My intuition and understanding of what's going to happen might very well 
be completely off, but I think it'd be interesting to know.

I'll take a look at your flent data, thanks for posting them!

Mikael Abrahamsson    email: swmike at swm.pp.se

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