samba - Jul 2005 - Strategy for tuning so_sndbuf and so_rcvbuf

Are there any tried and true strategies for  tuning so_sndbuf and so_rcvbuf 
settings?

In my particular application --  using a Samba server for video editing -- we 
have seen significant differences  in performance when we changes these 
values. For instance, we need to set  so_rcvbuf higher than the value you ALWAYS
see in people's smb.conf file.  

But is there a logical and accurate method for determining what are the  best 
settings on a particular system? 

And can anyone say with certainty  how the following factors would interact 
with the buffer settings: 

--  amount of RAM in the system
-- amount of data (MB/sec) being read from or  written to a fast RAID 
subsystem
-- number of SMB clients connecting to the  system simultaneously
-- amount of data (MB/sec) being sent to or received  from each client

Thanks for any suggestions

Andy Liebman