Re: net.link.bridge.member_ifaddrs has landed in stable/14

On Tue, May 20, 2025 at 10:05 PM Lexi Winter <ivy@freebsd.org> wrote:
>
> hello,
>
> i have just MFC'd the sysctl net.link.bridge.member_addrs to stable/14.
> for detail see: https://cgit.freebsd.org/src/commit/?h=stable/14&id=ff1980d569c8167d38cda5f2713664866d9802bc
>
> in short, if you have a bridge with a lot of members (20+) and you do
> not have any IP addresses assigned to those bridge members, you should
> see a significant performance improvement from enabling this sysctl.
>
> please feel free to test this and report any problems.

So to be clear, this is not the behavior change that's been much
talked about in -current. However, it's related to that change. If
people want to see if they are affected by that, they should set
sysctl net.link.bridge.member_ifaddrs=0 to see if their setup still
works. Of course, you'd want to do that to get the performance benefit
with lots of interfaces, but if you have just a few you might see a
behavior change when you update to -current or stable/15 in the
future. Nothing will break after this change w/o tweaking the sysctl,
but if will behoove you to do some controlled testing in the next year
sometime.

Warner