Use of dual CPU?

[Marco Calviani <mirtux@studenti.fisica.unifi.it>]

Hi,
 i have one general question regarding the use of a dual Opteron CPU 
using a smp kernel. I'm currently running a cpu intensive program that 
use for some hours 100% of the cpu time. But having a look with top at 
the processes it seems that only one CPU is doing the work at 100%: the 
other one seems idle for most of the time.
Here i'm posting the normal behaviour:

CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
          total   99,0%    0,0%    1,4%   0,0%     0,0%    0,0%   99,4%
          cpu00    0,0%    0,0%    0,4%   0,0%     0,0%    0,0%   99,5%
          cpu01   99,0%    0,0%    0,9%   0,0%     0,0%    0,0%    0,0%

Is this behaviour right for a dual cpu machine, or there is something 
not going right?

Thanks in advance,
MC