Netgear R7800 exploration (IPQ8065, QCA9984)

[hnyman]

You might test tweaking the CPU frequency scaling ramp-up parameters in kernel.
See

SQM fine in 17.01.4, can't keep up with line speed in 18.06 (Netgear R7800)

Hmm, interesting. Not sure what to make of all of that but it did prompt me to play around with CPU scaling. If I put the CPUs into performance mode (echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor, same for cpu1), fq_codel/simple can keep up with line speed. If the CPUs are in ondemand mode, it cannot. Interestingly, during a DSLreports download test, in ondemand mode, the CPUs don't both top out at top speed, the highest they get is: root@LEDE:~# cat /sys/devices/…

R7800 performance

I'm running a vanilla master build with software flow offloading, and I noticed that the CPU wasn't running at its fastest frequency while benchmarking WAN<->LAN. Speeds consistently topped out at 600Mbps on a gigabit link. Governor Consistent Speed Power Consumption while idle ondemand (default) ~600 Mbps <= 6.9W ondemand (tweaked) ~850Mbps <= 6.9W performance ~850Mbps >= 6.9W Tweaked settings for ondemand scheduler: echo 35 > /sys/devices/system/cpu/cpufreq/ondemand/up_thresho…