Network interrupt and NAPI in FreeBSD?

[Wei Hu]

Hi,

I am working on network driver performance for Hyper-V. I noticed the network interrupt rate on FreeBSD is significantly higher than Linux, in the same Hyper-V environment. The iperf test also shows the FreeBSD performance is not as good as Linux. Linux has NAPI built in which could avoid a lot of interrupts on a heavy loaded system. I am wondering if FreeBSD also support NAP in its network stack?

Also any thought on the network performance in general?

Thanks,
Wei