Hi,
Thanks to support from The FreeBSD Foundation I’ve been able to work
on improving the throughput of if_bridge.
It changes the (data path) locking to use the NET_EPOCH infrastructure.
Benchmarking shows substantial improvements (x5 in test setups).
This work is ready for wider testing now.
It’s under review here: https://reviews.freebsd.org/D24250
Patch for CURRENT: https://reviews.freebsd.org/D24250?download=true
Patches for stable/12:
https://people.freebsd.org/~kp/if_bridge/stable_12/
I’m not currently aware of any panics or issues resulting from these
patches.
Do note that if you run a Bhyve + tap on bridges setup the tap code
suffers from a similar bottleneck and you will likely not see major
improvements in single VM to host throughput. I would expect, but have
not tested, improvements in overall throughput (i.e. when multiple VMs
send traffic at the same time).
Best regards,
Kristof
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