On Wed, 2016-04-13 at 19:28 +0800, Ding Tianhong wrote: > Hi everyone: > > I have met this problem when I try to test udp6 for nfs connection, my > environment is: > > Server: > kernel: 4.1.15 > IP:xxxx::36/64 > MTU:1500 > Setting: /etc/exports:/home/nfs *(rw,sync,no_subtree_check,no_root_squash) > > Client: > kernel: 4.1.18 > IP:xxxx::90/64 > MTU:1500 > command: mount -t nfs -o vers=3,proto=udp6,rsize=4096,wsize=4096 > [xxxx::36]:/home/nfs /home/tmp > > I check the nfs parameter configuration, it looks fine and could work well > for proto=tcp6. > > Then I have mount correctly and try to run the command "ls", it hang. > > When I use the rsize=1024 and wsize=1024 to mount, the problem disappeared, > so I guess it is the problem for GSO or GRO for UDP。 > > Then I try to debug the problem, first I tcpdump the package from cline to > server, and found that > the client have send readdirplus message to server correctly, and then the > Server send a 4k package > to client(the big package will frag to 4 package by GSO), till now it looks > fine, and the Client Nic could > receive the 4 skb then send to upper stack to ipv6 and udp, I found the > incoming 4 package has been merged > to one and send to upper stack just like sunrpc, but I try to open the > rpc_debug, it looks that the rpc could > not receive message. > > > I built a simple demo to test the udp stack, use the client socket to send > big package to server socket, it work well, > so I think the udp is fine, maybe the bug is in sunrpc. > > The test is very simple, does any body met the same problem like me, thanks > for any suggestion. > > Ding
Have you tried to disable UFO ? ethtool -K eth... ufo off
