[Bloat] Other CAKE territory (was: CAKE in openwrt high CPU)

[Mikael Abrahamsson]

On Fri, 4 Sep 2020, Jonathan Morton wrote:

> We're usually seeing problems with the smaller-scale CPUs found in CPE 
> SoCs, which are very much geared to take advantage of hardware 
> accelerated packet forwarding.  I think in some cases there might 
> actually be insufficient internal I/O bandwidth to get 1Gbps out of the 
> NIC, into the CPU, and back out to the NIC again, only through the 
> dedicated forwarding path.  That could manifest itself as a lot of 
> kernel time spent waiting for the hardware, and can only really be 
> solved by redesigning the hardware.

There are lots of SoCs where CPU routing results in ~100 megabit/s of 
throughput, whilst the HW offload engine is perfectly capable of full gig 
speeds. MT7621 being one that actually is supported in OpenWrt.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se