I've been testing failure scenarios with VPP on a VM passing through a 2 port 10gE NIC. I'm seeing some major issues when one of the physical ports is disconnected that manifests itself as follows: - Ping tests are dropping at least 1/3 of the packets and half of them that do go through have latency approaching 2 seconds. - vppctl goes through regular cycles of being responsive and not being responsive. This includes using the tool interactively and occurs even while typing.
I tested adding additional CPUs and workers which helps the issue, but does not totally eliminate it. Giving it 4 cores and 2 workers keeps ping latency to sub millisecond, but I still get regular drop outs and vppctl responsive remains the same. I've dug through alot of the the documentation I can find and don't see a simple configuration setting or tuneable meant to alleviate this issue. Also note that if I disconnect both ports, vppctl is completely unresponsive and will hang indefinitely.
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