On Tue, 4 May 1999, Tony Finch wrote: > Matthew Dillon <dil...@apollo.backplane.com> wrote: > > > > (fanfair!) > > :-) > > > NFS attempts to realign packet buffers and trods all over the underlying > > mbufs. For TCP connections, several RPC's may be present in an mbuf > > chain. The realignment of one of them may destroy the others. This does > > not occur with UDP because each UDP packet contains only a single rpc. > > > > Packet buffers may be unaligned for a number of reasons. The main reason > > is due to the 14 byte MAC header on the ethernet frame. This causes the > > remainder of the packet - the ip payload - to NOT be 4-byte aligned. > > We're planning to try replacing some Solaris web servers with FreeBSD > machines in the near future. The documents are on a read-only NFS > filestore connected to the web servers with CDDI. (Updates will stay > on a Sun box.) Are we going to have nfs_realign problems if we use TCP > in this situation or should we stick with UDP?
I think UDP will probably work better. There won't be any problem with frames being re-ordered and the protocol overhead should be less. -- Doug Rabson Mail: d...@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
