Problem with samba on amd64

[Valerio daelli]

Hello everybody
we have a Sun Fire V20Z with dual Opteron.
We use FreeBSD 5.4. We tried both the single processor and the SMP kernel.
We experience very high load with samba 3.0.20b
and 3.0.14a. This the top of our top command:

last pid: 2317; load averages: 1.02, 0.98, 0.65 up 0+00:39:35 11:43:01
127 processes: 2 running, 125 sleeping
CPU states: 21.5% user, 0.0% nice, 78.1% system, 0.4% interrupt, 0.0% idle
Mem: 91M Active, 383M Inact, 214M Wired, 36K Cache, 214M Buf, 3166M Free
Swap: 8192M Total, 8192M Free

PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
714 root 122 0 18688K 5700K RUN 13:41 94.24% 94.24% smbd

Does anyone have any idea about?
Thanks

Valerio