PostgreSQL7.1 on AIX5L is running with too poor ferformance - Mailing list pgsql-hackers

Hi

PostgreSQL7.1 is now running on AIX5L( S85, 6GB memory, 6CPU), which was
running on Linux before(Pentium3, 2CPU, as far as I
remember.......sorry......).
The performance( on AIX5L ) is just half as good as the one( on Linux ).
I compiled PostgreSQL on AIX5L ofcourse.
I haven't configured it when migrating to AIX5L though.
Are there any problems in not tuning when migrating it to AIX5L?
What should I check first?
I can't make a head or tail of it:(
Help!!

Best regards,
Shuichi