[Bug 243869] ESXi v6.0 with VMNET 3 driver sluggish performance

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243869

            Bug ID: 243869
           Summary: ESXi v6.0 with VMNET 3 driver sluggish performance
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: lefty at spes.gr

A bug/issue problem is introduced in FreeBSD 12.1 and vmxnet 3 network driver.
After upgrading to FreeBSD 12.1 from 12.0 under ESXi v6.0 and using vmxnet 3,
network performance becomes very sluggish. Problem is solved by either
switching VM to use E1000 network driver or upgrading to a later ESXi version.
Please fix the issue as ESXi upgrading is not always possible. Driver was
working very well in 12.0. Thank you

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