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netgraph/ng_bridge: Avoid cache thrashing

Authored by donner on Feb 11 2021, 11:12 PM.



Hint the compiler, that the branch is taken at most once per second.
Only in this case the memory line needs to be written. This will
reduce the amount of cache trashing during forward of most frames.

Suggested by: @zec

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rG FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

donner retitled this revision from netgraph&/ng_bridge: Avoid cache thrashing to netgraph/ng_bridge: Avoid cache thrashing.Feb 11 2021, 11:13 PM
donner added a reviewer: network.

Rebase after other changes.

This revision is now accepted and ready to land.May 13 2021, 5:00 PM
This revision was automatically updated to reflect the committed changes.