Low speeds with SQM on GL.iNet sft1200 Opal

Routers
1

Hi everyone,

I recently set up a GL.iNet SFT1200AC “Opal” as my main router, cascaded with three Deco X20 (AX1800) units running in Access Point mode.

My goal was to reduce bufferbloat, since I was having issues with streaming and social media lag.

My ISP provides an FWA connection rated at 100/30 Mbps, though I usually get around 200/40 Mbps during the day and 150/25 Mbps in the evening.

After enabling SQM (CAKE + piece_of_cake.qos), speeds dropped dramatically: I can’t get more than ~65 Mbps down and ~20 Mbps up, even when setting generous bandwidth limits.

I’ve tried link layer adaptation 44 bytes (and 34 bytes) without noticeable difference.

Am I missing something in the configuration, or is the GL SFT1200 simply too weak to handle CAKE at higher speeds?

Thanks in advance for any insights or shared experiences!

2

Did you happen to reference this guide regarding sqm?

3

A device rated to do Wireguard at 65Mbps is likely to be short on CPU power necessary for SQM.

3 Likes
4

yes, I did

5

It's most likely that the CPU isn't powerful enough for sqm/cake.

1 Like
6

flow offload functionality was added in Linux Kernel 4.14, this was backported from 4.17 by Openwrt.

It’s unclear from the siflower provided kernel sources if offload functionality is enabled in the GL stock firmware for the Opal.