On Thu, May 09, 2019 at 10:38:15PM +0000, Andrew Gallatin wrote:
> Author: gallatin
> Date: Thu May  9 22:38:15 2019
> New Revision: 347410
> URL: https://svnweb.freebsd.org/changeset/base/347410
> 
> Log:
>   Remove IPSEC from GENERIC due to performance issues
>   
> @@ -30,7 +30,6 @@ options     PREEMPTION              # Enable ...
>  options      VIMAGE                  # Subsystem virtualization, e.g. VNET
>  options      INET                    # InterNETworking
>  options      INET6                   # IPv6 communications protocols
> -options      IPSEC                   # IP (v4/v6) security
>  options      IPSEC_SUPPORT           # Allow kldload of ipsec and tcpmd5

I've asked this question some two years ago, but no one could answer it
back then, so I'll try again.

What is the reason behind having IPSEC_SUPPORT option instead of no special
option at all?  If I grep for SUPPORT in conf/GENERIC, I see things like
INVARIANT_SUPPORT or IEEE80211_SUPPORT_MESH (with meaningful explanations)
but IPSEC_SUPPORT which, per the comment, "allows to kldload of ipsec and
tcpmd5", is totally beyond me.  Lots of kernel features are/can be loaded
as modules, but we don't have things like SOUND_SUPPORT or USB_SUPPORT.

./danfe
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