Re: CFT: if_bridge performance improvements

вт, 14 апр. 2020 г., 12:51 Kristof Provost <kp_at_freebsd.org>:

> 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
>

Hi!
Thank you for your work!
Do you know if epair suffers from the same issue as tap?

>