Client, Macintosh G4, OS X 10.4.11
NFS Mount is done with the following options... -P (privileged ports) intr -r=32768 -w=32768 I tried doubling the size of the read/write windows to 65536 but it seemed to make little difference.
Task, Read / Write 648 Megabyte Photoshop file (PSD) Win2K = Win2K server (slow), RAID 5, Symantec EndPoint (ugh), retiring this server AFP = Netatalk from new CentOS Server SMB = Samba from new CentOS Server NFS = see above options, same CentOS Server
Copy To Win2K AFP SMB NFS 1m40.053s 0m22.566s 0m23.817s 2m11.849s
Copy From Win2K AFP SMB NFS 1m34.478s 0m20.709s 0m20.823s 0m23.487s
NFS read performance was slightly slower than AFP/SMB but the write performance was poor.
I had a similar problem with a freebsd box awhile ago and the solution was to mount an nfs share with much lower r/w buffer size (2048?). There also was something in the logs related to nfs server timeouts or server not responding.
HTH