[Bug 258133] toggling TSO fixes latency/slowness

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258133

            Bug ID: 258133
           Summary: toggling TSO fixes latency/slowness
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: nbari@tequila.io

The main interface in the system is igb0, it has a vlan0 interface with other
gateway (fib 1) in where in theory TSO is enable by default:

vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1400
       
options=4600703<RXCSUM,TXCSUM,TSO4,TSO6,LRO,RXCSUM_IPV6,TXCSUM_IPV6,NOMAP>


I started to notice some latency issues on the VLAN and by just enabling again
TSO the problem was fixed:

ifconfig vlan0 -tso 
ifconfig vlan0 tso


Is there a way to ensure that TSO is always enabled also for newly created
interfaces or probably by enabling/disabling TSO fixes other issues?

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