Date: Tue, 14 Apr 2020 11:53:16 +0200 From: "Kristof Provost" <kp@FreeBSD.org> To: freebsd-stable@freebsd.org Subject: CFT: if_bridge performance improvements Message-ID: <5E5BAA7D-8FDE-4163-997A-29D68F5FC642@FreeBSD.org>
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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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