Hi. Nearly, I found the values both of IfOutDiscards and IfInDiscards are
2^31-1 in our environment. The SFlow returned a record is filled its all bits
with 1. I checked the relevant code, the implementation of SFlow in OVS ignored
the error from netdev_get_stats (see
https://github.com/openvswitch/ovs/blob/c6538b443984e10c266d7e75e797ef2f1b722d61/ofproto/ofproto-dpif-sflow.c#L351),
caused some bad values are reported. But in RFC2233, A SFlow implement 'MUST
NOT' instantiates an object with an incorrect value(see
https://www.rfc-editor.org/rfc/rfc2233.txt#:~:text=specific%20MIB.%0A%0A3.1.18.-,All%20Values%20Must%20be%20Known,-There%20are%20a
).
So, I think we had better return an error here, but not ignore it.
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