[jeffbee]

Half-way through the article it just says UDP receive coalescing, once, and never mentions it again. Do they mean interrupt mitigation? If so, using what parameters?

[ignoramous]

I guess UDP receive coalescing is UDP GRO (generic recv offload) + recvmmsg(2)

[raggi]

Yup, this is referring to GRO.

IIRC we use a contiguous 64kb buffer in the first scatter-gather slot and 128 messages per syscall in the current tuning.

[jordanwhited]

Author here. There was no interrupt tuning performed on the devices under test. UDP receive coalescing was enabled via the UDP_GRO sockopt.