Samba / Winbindd Performance Problems

[Trollhorn]

We are just experiencing another Problem with our Thecus N5200PRO. After having serious trouble with Office 2007 file locking (which could not be resolved till now), now we have a brand new shiny unix problem.

Symptoms:

- Listing an directory with 10 Folders via SMB takes about 5 seconds.
- Opening a Document with 500 kb takes nearly a minute

This is what top looks like:

  PID USER     STATUS   RSS  PPID %CPU %MEM COMMAND
26441 root     S       2788     1 43.9  0.5 winbindd
26468 root     S       1200 26441 30.9  0.2 winbindd
29911 21431    S       6648 26435  3.7  1.3 smbd
 9776 21424    S        10M 26435  2.3  2.1 smbd
21053 21349    S       6152 26435  1.1  1.2 smbd
18543 21322    S        10M 26435  0.0  2.1 smbd
24160 21132    S        10M 26435  0.0  2.1 smbd
18761 root     S       8880 26435  0.0  1.7 smbd
 2699 root     S       7776 26435  0.0  1.5 smbd
 9086 21400    S       7124 26435  0.0  1.4 smbd
10704 21170    S       6824 26435  0.0  1.3 smbd
 7816 21162    S       6428 26435  0.0  1.2 smbd
11014 root     S       4180 26435  0.0  0.8 smbd
25818 root     S       3480 26435  0.0  0.6 smbd
 5374 root     S       3424  3882  0.0  0.6 httpd
10671 root     S       3416  3882  0.0  0.6 httpd
29857 root     S       3068 26435  0.0  0.6 smbd
25459 root     S       3048 26435  0.0  0.6 smbd
30082 root     S       3012 26435  0.0  0.5 smbd

I really cant understand why winbind should need that much performance. The shares without any ACL are very fast and are not experiencing any problems. Maybe someone got any idea?

Thanks,

Troll