RM500Q slow with qmi_wwan, fast with proprietary

[Nick]

Hey,

I am testing a Quectel RM500Q on OpenWrt master, and have noticed to my surprise that the speed is much slower when using the qmi_wwan with MM than it is when using qmi_wwan_q and quectel-CM (Quectel’s proprietary driver and connection manager). Under good signal conditions the speed tops out at around 100Mbps on qmi_wwan + MM (and is a little bit faster when in MBIM mode with MM), but switching to qmi_wwan_q and quectel_CM it gets the expected 700Mbps+ where I am. Is there an easy explanation for this? Any suggestions as to what I can change to get speeds equivalent to the proprietary stack?

Best,
Nick