db_file_multiblock_read_count and performance

I have been testing this extensively over the last few months. I do a full 
table scan with a db_file_multiblock_read_count = 1 and then one = 128( i check 
the 10046 trace to verify i am getting this much) and I see absolutely no 
difference whatsoever in response time. 
i am doing 
select count(*)
from heap_table;
I have tested this on windows xp, solaris, with EMC, netapp, and regular old 
cheap off the shelf hard drives. I have tested it in 8.1.7, 9.0,9.1,9.2.
has anyone see a response time improvement from this parameter anywhere? 
--
http://www.freelists.org/webpage/oracle-l

Other related posts: