[Bug 230970] bridge interface slow downs bandwith speed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230970

            Bug ID: 230970
           Summary: bridge interface slow downs bandwith speed
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: standards
          Assignee: standards at FreeBSD.org
          Reporter: arkadiusz.majewski at iptrace.pl

Dear All!

I posted an issue on official forum without any reply.
So, I will paste the conetct of the thread here. Maybe it's possible to
investigate and resolve the issue, bug.

https://forums.freebsd.org/threads/bhyve-vtnet-with-taps-and-low-local-speed-traffic.67259/

I've found the issue on my virtual infrastracture.
The speed descreases after moving between virtual machines.

Hypervisor:
OS: FreeBSD 11.2
Application: bhyve
Network: bridge+tap

Guests:
OS: FreeBSD 11.2
Network: vtnet
media: Ethernet 10Gbase-T <full-duplex>

Traffic flow:
INTERNET <-> hypervisor <-> FW (vm guest) <-> server (vm guest)

I set MTU to 4070 (max) and to 1500 as default standard, no difference.
All PF filters allowed without logging. After speed testing it looks like this.


hypervisor:~ % speedtest-cli --server 5134
Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by NETIA S.A. (Warsaw) [10.25 km]: 2.415 ms
Testing download
speed................................................................................
Download: 1458.58 Mbit/s
Testing upload
speed................................................................................................
Upload: 617.50 Mbit/s


FW:~ % speedtest-cli --server 5134
Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by NETIA S.A. (Warsaw) [252.37 km]: 1.944 ms
Testing download
speed................................................................................
Download: 1135.09 Mbit/s
Testing upload
speed................................................................................................
Upload: 561.99 Mbit/s


server:~ % speedtest-cli --server 5134
Retrieving speedtest.net configuration...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by NETIA S.A. (Warsaw) [252.37 km]: 2.324 ms
Testing download
speed................................................................................
Download: 626.66 Mbit/s
Testing upload
speed................................................................................................
Upload: 574.15 Mbit/s

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