[Samba] smbd memory usage

[Chris]

Trying to understand the smbd process memory usage.
In this case, "top" reports that most users are using 0.3-0.5% of 
available memory (1GB real memory in server), but several users show 
more.
One shows 3% another 6% and yet another 25%. For the 3% user smbstatus 
shows 2 sessions, 10 connections, plus many locked files, and has been 
connected the longest period of time. However, for a similar user, only 
0.6% memory usage is displayed.
The 6% user has 1 session, 4 connections (the standard number for 
ordinary users due to a logon script), and no locked files. And the 25% 
user shows the same, and this system is primarily "hands off" as it's 
main purpose is to display a powerpoint slideshow (the file resides 
locally on the client) on a television.

Also there are many smbd processes owned by root, most show 0.4-0.6% 
memory usage but one shows 7% memory usage.

What can account for the differences and are they normal?

Thanks.

Chris