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xennet0: rx no buf

I'm finding that my NetBSD 7 web-server VMs are often dropping off the network with "xennet0: rx no buf" errors, even under only moderate load. When this happens, the machines usually end up unresponsive and need to be hard-rebooted.

When this has been mentioned previously, there was an explanation of the cause, but no suggestions of how the problem may be mitigated. I'm not sure the explanation was correct either as the error is "rx no buf", not "rx no mbuf", i.e.:


What can be done to improve the situation?


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