I have an ARM Linux board that is a router to 16 other boards. When all these download their updates via the router, the network routing effort starves the user space so that a software watchdog (and later on the hardware watchdog) triggers at the router.
Is there a way to renice routing efforts without packet drops?
I am aware that I could run the application with 'above normal' priority but that would have other unwanted side effects. I also have tried traffic shaping with both ingress and token bucket filters but I don't succeed even if I throttle bandwidth usage to 1-2 mbps. If I reduce the node count to five, I can serve up to 15mbps on average, 20 peak. The hardware is too slow to reach more than 30mbps on a fast ethernet link.
eth0: common network at every board
eth1: toward FTP-gateway, only at router
- no bridging, just IP-forwarding