What's netstat -sp tcp show before/after the test?
-adrian On 4 September 2013 15:20, David Wolfskill <da...@catwhisker.org> wrote: > 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. > _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
