[Cake] A few puzzling Cake results

Toke Høiland-Jørgensen toke at toke.dk
Tue Apr 17 08:22:27 EDT 2018

Y via Cake <cake at lists.bufferbloat.net> writes:

> From: Y <intruder_tkyf at yahoo.fr>
> Subject: Re: [Cake] A few puzzling Cake results
> To: cake at lists.bufferbloat.net
> Date: Tue, 17 Apr 2018 21:05:12 +0900
> Hi.
> Any certain fomula of fq_codel flow number?

Well, given N active bulk flows with packet size L, and assuming the
quantum Q=L (which is the default for FQ-CoDel at full-size 1500-byte
packets), the maximum rate for a sparse flow, R_s, is bounded by

R_s < R / ((L/L_s)(N+1))

Where R is the link rate and L_s is the packet size of the sparse flow.
This assumes that the sparse flow has constant spacing between its
packets, which is often the case for a VoIP flow...


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