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Re: xennet0: rx no buf

On Tue, 21 Feb 2017, Michael van Elst wrote:
netbsd%precedence.co.uk@localhost (Stephen Borrill) writes:

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.

The code is pretty naive with buffer allocation.

That doesn't make it any less annoying. Adding RAM doesn't appear to help.

Any workarounds or mitigation besides rebooting nightly? Can I pre-emptively check for near buffer exhaustion to allow for a reboot or ifconfig down/up?


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