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Poor performance on Solaris

Hi,

we had some performance issues on our ldap servers running Solaris 10 sparc.

I did some tests using slamd http://www.slamd.com/ and got disturbing results:

ldap-service: OpenLDAP 2.4.23, setup identical on both boxes, threads=64, identical content.

box1: 
hardware: Sun Microsystems  sun4v SPARC Enterprise T5120
memory:32 GB RAM
os: Solaris 10 s10s_u9wos_14a
searches (avg/second): 1521

box2:
hardware: AMD 64 phenom 9850
memory: 8 GB RAM
os: Linux dsv00000 2.6.36.2 #1 SMP Mon Dec 27 10:09:29 CET 2010 x86_64 AMD Phenom(tm) 9850 Quad-Core Processor AuthenticAMD GNU/Linux
searches (avg/second): 22968

I am looking for some hints to improve performance on box1 to a similar level as on box2 or an explanation why on box1 performance is so bad.

As slapd.conf, ldap.conf and DB_CONFIG are identical there should not be such a big gap in performance.

Juergen Sprenger