openvpn and system overhead

[Konstantin Belousov]

On Fri, Apr 19, 2019 at 01:01:06PM -0400, Kurt Lidl wrote:
> Well, FreeBSD does have sendmmsg()/recvmmsg(), which allows for
> sending/receiving multiple packets per system call.  I do not know if
> the "tun" device allows for send/recv type processing, or just
> read/write.
sendmmsg and recvmmsg are userspace wrappers, they are not real syscalls.