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Date: Fri, 19 Apr 2019 18:42:00 +0200 (CEST)
From: Wojciech Puchar <wojtek@puchar.net>
To: Eugene Grosbein <eugen@grosbein.net>
cc: Wojciech Puchar <wojtek@puchar.net>, freebsd-hackers@freebsd.org
Subject: Re: openvpn and system overhead
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> because of unavoidable and big overhead due to constant context switching
> from user land to kernel land and back. Be it openvpn or another userland daemon.
>
> You need either some netmap-based solution or kernel-side vpn like IPsec (maybe with l2tp).

well it has to cooperate with multitude of clients like windoze, 
point&click routers etc. that's why openvpn.