[Bug 242070] scp on 12.1p1-RELEASE is painfully slow

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242070

info at murrawhip.net changed:

           What    |Removed                     |Added
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                 CC|                            |info at murrawhip.net

--- Comment #5 from info at murrawhip.net ---
I'm also experiencing this after upgrading from 11.3 to 12.1. Scp and HTTP GET
slows down to 5-10KB/s where I'm expecting 50MB or more. 

I'm running the VM under ESXI 5.5 as VMXNET 3.


```
vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=e403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether 00:50:56:a9:a5:8f
        inet 192.168.0.7 netmask 0xffffff00 broadcast 192.168.0.255
        media: Ethernet autoselect
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
```

When I do `ifconfig vmx0 -tso41` I immediately get the proper 50MB/s speeds.
When I `ifconfig vmx0 tso4` the slowness comes back.

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