sendto: no buffer space available (yet no queue and plenty mbufs)

From: Christoffer Pio (cp_at_cvt.dk)
Date: 08/27/03

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    Date: Wed, 27 Aug 2003 16:57:02 +0200
To: freebsd-isp@freebsd.org

    I'm experiencing the em intel nic 100/1000 mb driver produces the
    'no buffer space available' error when I break the connection (pull out
    the cable), yet netstat -m and netstat -an shows no packets in queue
    and plenty of mbuf and nmbclusters free. When I plug the cable back in
    ping resumes shortly working alright ..

    It must be the buffer on the NIC which gets exhausted? I am trying to make sure
    it is safe to put the box into production environment, the em driver is not
    buggy on freebsd 4.8 ?

    Christoffer
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