On Wed, Sep 04, 2013 at 03:03:12PM -0700, Adrian Chadd wrote: > Hiya, > > David - can you put together a minimal test case that others can reproduce? > I have a bunch of gige intel NICs that I can try this with when I'm back in > the office. > ...
On NFS client machine (w/ Intel NICs): * Ensure that net.inet.tcp.tso=1. * Create or gain access to a regular file, size > 2^21 bytes. * In my case, "ifconfig em0" showed both TSO4 & VLAN_HWTSO. I have not experimented to determine whether either or both of those is required -- and in my case, the machine is my desktop here at work: I would prefer to avoid breaking it. :-} * Mount a writable file system with adequate free space via NFS. * Write the file (e.g., via cp(1)). If that fails to re-create the problem, perhaps you'll need to have another NIC and run IPFW & natd. Something similar to the stock "simple" configuration (/etc/rc.firewall) should do. During the write, I would run "tcpdump -s 0 -w /tmp/cp.bpf host $NFS_server", then look at the captured traffic later. I used wireshark; it pointed out the retransmissions. Peace, david -- David H. Wolfskill da...@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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