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To: dave seddon <dave.seddon.ca@gmail.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>, Frantisek Borsik
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Date: Mon, 23 Feb 2026 11:18:37 +0100
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Subject: [Make-wifi-fast] Re: [Cake] Re: [Bloat] Re: CAKE-MQ merged to OpenWrt 25.12 today (February 15)
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dave seddon <dave.seddon.ca@gmail.com> writes:

> Thanks for the replies guys.
>
> I'm using a desktop class machine with a Ryzen Threadripper PRO 3945WX
> (12 cores/24 threads).  - It's really not fast enough for what I was
> attempting.  When you are used to using more powerful machines at
> work, it's easy to forget how powerful server class machines are.
>
> I tried creating many flows using a combination of tools, but this
> just saturates all the cores, causing RTTs to spike due to CPU
> contention.  The idea was to simulate lots of flows like you might
> have at a conference, but I'm going to need more and more powerful
> machines.
>
> This is the mq-cake config
>
>   Flows: fping=1, iperf2=300, wrk=100, dnsperf=20, flent=1, crusader=1
>   Qdisc: mq-cake
>     ixgbe0:
>       qdisc mq 1: root
>       qdisc cake 8005: parent 1:3 bandwidth 10Gbit diffserv4
> triple-isolate nat wash no-ack-filter split-gso rtt 100ms raw overhead
> 0

[...]

Erm, why this setup? You're asking each instance of cake to shape at
10Gbit (on a single CPU), for a total bandwidth of 80 Gbit. Multi-queue
shaping with cake is exactly the use case that the cake_mq qdisc is
meant to be used for, so try that?

-Toke