netmap (IPS) and traffic graphs empty

[AdSchellevis]

Probably a setting we should document, by default net.bpf.zerocopy_enable is disabled, which means that traffic graphs will not show any traffic when IPS is enabled.

In tunables set net.bpf.zerocopy_enable=1 and restart IPS to "fix" the issue, likely with a small performance penalty.

[mimugmail]

Sounds reasonable .. https://forum.opnsense.org/index.php?topic=18373.0

[AdSchellevis]

@mimugmail yep, there's a switch for that. which is actually quite logical, because it would involve moving the packet around which was referenced (zero copy) before. I don't think we should change the default without notice, but I kind of expect some of this worked by accident on fbsd 11

[mimugmail]

Better let's wait for more feedback. I also have feedback on different things which worked on fbsd 11 and behaves different on fbsd 12

[AdSchellevis]

From a system perspective / choosing defaults it's more a choice between performance (zero copy) and function (breaking the chain), either way it should be anywhere in the documentation to explain the consequences, since these seem to be difficult to find.

[mimugmail]

Ok for two different topics this one doesn't help:
https://forum.opnsense.org/index.php?topic=18426.msg83791;topicseen#msg83791

[AdSchellevis]

could be literally anything, but usually driver/hardware related