My bad typing, what I actually ran was
ALTER system set plsql_optimize_level=0;
and as stated before the results became very close to the 9.2.0.7 ones.
From: Sriram Kumar <k.sriramkumar@xxxxxxxxx> Subject: Re: LIOs from 10g when using CPU_TEST.SQL
The parameter name as per documentation is plsql_optimize_level but is referred as plsql optimization level.
Tim can you confirm if you executed
ALTER system set plsql_optimization_level=0; or ALTER system set plsql_optimize_level=0;??
-- //www.freelists.org/webpage/oracle-l