In my ongoing quest to minimize I/O I will next try to reduce the number of index pages I have. 4 tables in the benchmark get rows inserted: history, order_line, oorder and new_order and the history table doesn't have any indexes on it.
This means the remaining tables have no inserts and I can set FILLFACTOR to 100 and put as much index data on a page that will fit and hopefully reduce my I/O.
For the 3 tables that currently do have indexes and are inserted into I will start by changing the FILLFACTOR from the default of 80 to 90 and see what happens. Over the course of the benchmark I increase the number of rows in these tables by 5%, so a more optimal FILLFACTOR may be 95%. I'll try that second and then try a FILLFACTOR of 100% for all tables just for fun.
FILLFACTOR 90% for my 3 insert tables - TPM 6190, meh, not much improvement over 6187.
FILLFACTOR 95% - TPM 6100
FILLFACTOR 100% - TPM 6165
I think it is interesting that FILLFACTOR 100% outperformed FILLFACTOR 95%, other than that nothing of any real excitement going on here.