High CPU utilization

Hi am facing high cpu utilization on my sybase server.

I have P550
Number Of Processors: 4
Processor Clock Speed: 1656 MHz
CPU Type: 64-bit
Kernel Type: 32-bit
LPAR Info: 1 65-D837E
Memory Size: 7840 MB

in topas it shows

Name PID CPU% PgSp Owner
dataserv 565264 23.7 1.5 ldapdb2
dataserv 348328 25.3 1.5 idsldap
dataserv 491706 20.5 1.5 idsldap
dataserv 594162 16.4 1.5 ldapdb2

what to do to reduce this utilization.

Tune your LDAP application or try changing the scheduling of your AIX.

Please post the output of

vmstat 1 10

What AIX Version do you use?