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High throughput bgp links using gentoo + stipped kernel

> As for migration to another OS, I find FreeBSD better as a matter of
> network performance. The last time I checked OpenBSD was either
> lacking or was in the early stages of multiple cores support.

If you do decide to go the FreeBSD route (you can run openbgpd on 
FreeBSD if you like), check out the POLLING option on ethernet NICs, it 
cuts down on the number of interrupts and can increase performance, 
particularly when dealing with smaller packets.