Comment 71 for bug 561210

I had the same issue with all of my linux clients here accessing a gigabit NAS. However after messing around the last weeks with this issue i finally found this hint:

http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/HT_prftungd_impr_nfs_client_writing_perf.htm

Mounting the NFS shares with option combehind in the clients solved the problem for me.