[Bug 272944] Vnet performance issues

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272944

--- Comment #5 from jSML4ThWwBID69YC@protonmail.com ---
(In reply to Mark Johnston from comment #4)

Hello Mark,

Please see the emailed video. It shows a sixty second iperf3 test with the
output of top in the jail, and on the host. 

This test used a local network Vlan for communication. So far as I can tell,
the performance is not impacted by using a Vlan on Vnet. 

I tried using the PCBGROUP, and RSS options in the kernel configuration. The
kernel builds and installs fine. After reboot, I was able to ssh back in, but
it seems most networking is broken. Trying Iperf, Curl, Fetch all fail with
timeouts both on the host system and in a jail. Removing those options,
rebuilding the kernel and rebooting makes everything work again.

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