We're looking at the possibility of a very similar move, so if you come across the actual reason, I would be interested. Some of my thoughts though...
1) The smaller CPs on the zEC12 may keep a single high importance TCB from dominating as much of the machine. E.G. such a TCB could consume about twice as much CPU on the 504 as it can on the 408. 2) Because you have more CPs, you have more total L1 and L1.5/L2 cache (although less per core) and certainly a lot more cache overall. That may be substantially beneficial to certain workloads/configurations. 3) It would be natural (at least for us) when doing a processor upgrade to add memory. If you're avoiding paging and I/O due to having more memory, that could be some small improvement in CPU as well. It would be interesting to look at SMF 113 data before and after the upgrade. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
