Sun Microsystems Blade 1500 - TABLE C-4 Interleaving Modes

C-14 Sun Blade 1500 Service, Diagnostics, and Troubleshooting Manual • December 2004
C.3.6.3 DIMM Interleaving
DIMM interleaving is interleaving between pairs of DIMMs. Interleaving between
DIMMs can be done only if all four DIMMs are the same. If the pairs are different, it
is still possible to interleave external banks (in double bank DIMMs) and internal
banks.
For maximum interleaving performance all DIMMs need to be the same Sun part
number.
Note – There are no constraints for bank or rank interleaving within the same pair.
TABLE C-4 shows the different interleaving modes supported based on the DIMMs
used.
C.3.6.4 XOR Interleaving
The Sun Blade 1500 workstation also supports a fourth interleaving mode called
XOR interleaving. This interleaving mode is used to distribute L2 cache conflict
misses and L2 cache read/writeback pairs across more banks.
To use XOR interleaving, all DIMMs must be identical. XOR interleaving is a special
case that is not described in
TABLE C-4.
TABLE C-4 Interleaving Modes
DIMM Pairs DIMM Type Interleaving Mode Support
1 Single bank Bank
1 Dual bank Bank/rank
2 Diff, single-single Bank
2 Diff, single-double Bank/rank, bank/rank
2 Diff, double-double Bank/rank, bank/rank
2 Same, single-single Bank/DIMM
2 Same, single-double Bank/DIMM/rank (on double)
2 Same, double-
double
Bank/DIMM/rank