[Bug 198406] More than 4 esxi vmxnet3 interfaces causes vlans attached to vmxnet interfaces to stop working

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198406

Bryan Venteicher <bryanv at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |bryanv at FreeBSD.org

--- Comment #8 from Bryan Venteicher <bryanv at FreeBSD.org> ---
There is no limit in the vmx(4) driver; it sounds like interrupts are broken
when the fifth interface is added.

If the driver negotiates multiqueue (only if MSIX is available) perhaps we are
exhausting some MSIX limit but an error is not bubbled up. You could try
setting the `hw.vmx.mq_disable` tunable to disable multiqueue.

Unfortunately, I don't have access to an VMware ESXi environment to do any
investigation.

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