R7800 SQM reducing speeds from 400/20 to around 100/20

Installing and Using OpenWrt
1

Looking for some help setting up SQM correctly so that I am not losing so much speed. My internet is 400down/20up with sqm disabled, but drops to around 100down/20up when sqm enabled. I have tried adjusting most settings without any luck. I know to expect some loss of speed, but this seems excessive.

Cake/POC

root@OpenWrt:~# cat /etc/config/sqm

config queue 'eth0'
        option verbosity '5'
        option linklayer 'ethernet'
        option qdisc 'cake'
        option script 'piece_of_cake.qos'
        option interface 'eth0.2'
        option debug_logging '1'
        option download '380000'
        option upload '19000'
        option enabled '1'
        option overhead '34'
2

@moeller0 Any help would be appreciated.

3

Is there any need to really throttle the download? The upstream links / bandwidth from servers in use are likely slower than your last mile.
You likely spend, unnecessarily, lots of CPU time in calculating throttling for the download streams.

Alternatively:
cake causes heavy calculation for ultra-high speeds (like your half-gigabit...)
Test switching to simple.qos with fq_codel, which consumes much less CPU.

4

I am mostly off-line while on holiday, so any meaningful response will have to wait until I am back....

1 Like
5

Why do you even answer? ;- ) Keep on the holiday and don't answer me : -)

1 Like
6

Thanks for the reply.
With Ingress disabled and cake/POC at 200/20.
On simple/fq_codel, both ingress/egress, I am at 300/20
With ingress disabled, and simple/fq_codel I am now at 350/20.

Seems strange to still have reduced speeds with ingress disabled.