I know, the obvious answer is CPU load. However. I recently set up my little home file server again, and I didn't bother to set up any r/w samba shares so I could just leave everything at r/o guest ...
I've got the following setup: Server: Debian 5 running Samba 3.2.5 + BIND 9.5.1 + apache 2.2.9 Client1: Debian 5 with smbfs 3.2.5 Client2: Ubuntu 9.04 with smbfs 3.3.2 Just within the last few days, ...