Try with Trond Myklebust's latest NFS patchset from http://client.linux-nfs.org/
If that doesn't help, check your actual disk performance, if the disks in the server aren't fast, no NFS optimizations are going to help you. Failing everything else, ask on the lkml about it, they usually pretty helpful, and will often help in tracking down the source of the problems.
-- gentoo-amd64@gentoo.org mailing list
