The 870/40 four-way server incorporates four Intel Pentium III Xeon microprocessors with 2 GB of main memory running at 550 MHz, each with 2 Mbytes of second-level cache
The memory hierarchy works best if the requested instructions are most often found in the primary (first level or L1) instruction cache, if misses in the primary instruction cache are most often satisfied by the second-level cache
(if any), and so on.
However, this data often still resides in the second-level cache
, and we have effectively prefetched the informing load data into the second-level cache