From: "lhecking@users.sourceforge.net" lhecking@users.sourceforge.net
The symptoms are: read access is extremely slow, write access seems to work in principle (e.g. creating a zeros-sized file on a share), but writing even small files (100k) to the share eventually times out with "out of memory or disk space" errors. These shares are home directories NFS-mounted on the samba s erver. Shares of local disks work fine as expected.
Just in case, what's your nic MTU...? Maybe read http://serverfault.com/questions/68330/samba-sharing-an-nfs-mount-point
JD