How to make UDP server performance better?

[Zhuo Meng]

Hi, Gophers

I'm doing benmarking for my GoNTPd .

I found that my implement is only can handle about 100Kpps (kilo packets per second) per goroutine while ntpd can handle about 170 Kpps. on Intel Xeon E312

The pprof shows most of function time spend on syscall.Syscall6 (Read/Write from UDP socket), how can I improve that?

Many thanks!

[Matt Harden]

The time spent in the syscall would include time blocked, waiting for a packet to arrive. I would look at the other parts of the profile for possible improvements. The kernel may also be dropping packets if there is not enough buffer space to receive them into; see the SO_RCVBUF socket option. Maybe ntpd sets this option to a larger value than the default.

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