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List: netbsd-port-xen
Subject: xennet0: rx no buf after upgrading to NetBSD 7
From: Stephen Borrill <netbsd () precedence ! co ! uk>
Date: 2016-11-14 9:42:08
Message-ID: Pine.NEB.4.64.1611140917470.524 () ugly ! internal ! precedence ! co ! uk
[Download RAW message or body]
I've upgraded a web-server from NetBSD 5/i386 to 7/amd64 and now I'm
frequently getting "xennet0: rx no buf". I don't think the server is any
busier than it was before, but I guess there could be sporadic DoS
attacks on it.
Of course, when I look now, it's all idle:
# netstat -m
5 mbufs in use:
1 mbufs allocated to data
3 mbufs allocated to packet headers
1 mbufs allocated to socket names and addresses
93318 calls to protocol drain routines
kern.mbuf.nmbclusters = 98304
I looked at this thread:
https://mail-index.netbsd.org/port-xen/2015/03/28/msg008611.html
While it may explain what is behind the message, it's short on ways to
mitigate it.
--
Stephen
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