I recently have been experiencing network "freezes" and network
"lockups" on our Freebsd 9.1 systems which are running zfs and nfs file
servers.
I upgraded from 9.0 to 9.1 about 2 months ago and we have been having
issues with almost bi-monthly. The issue manifests in the system
becomes unresponsive to any/all nfs clients. The system is not
resource bound as our I/O is low to disk and our network is usually in
the 20mbit/40mbit range. We do notice a correlation between temporary
i/o spikes and network freezes but not enough to send our system in to
"lockup" mode for the next 5min. Currently we have 4 igb nics in 2
aggr's with 8 queue's per nic and our dev.igb reports:
dev.igb.3.%desc: Intel(R) PRO/1000 Network Connection version - 2.3.4
I am almost certain the problem is with the ibg driver as a friend is
also experiencing the same problem with the same intel igb nic. He has
addressed the issue by restarting the network using netif on his
systems. According to my friend, once the network interfaces get
cleared, everything comes back and starts working as expected.
I have noticed an issue with the igb driver and I was looking for
thoughts on how to help address this problem.
http://freebsd.1045724.n5.nabble.com/em-igb-if-transmit-drbr-and-ALTQ-td5760338.html
Thoughts/Ideas are greatly appreciated!!!
-C
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