L1 Data cache = 64 KB. 64 B/line, 2-WAY. (Write-Allocate), 8 Banks, Exclusive with L2 cache.
L1 Instruction cache = 64 KB. 64 B/line
L2 cache size = 512 KB. 64 B/line, 16-WAY
L2 cache latency = 12 (14, if high L2<->L1 traffic)
L3 cache size = 6 MB. 64 B/line, 16-WAY
L3 cache latency = 40
TLB L1 size = 48 items. Miss penalty = 5. Only two misses at time can be processed.
TLB L2 size = 512 items. Miss penalty = 35. Only one miss at time can be processed.
PDE cache size = ? entries cover ? MB. Miss penalty = ?
| Size | Latency | Description |
|---|---|---|
| 64 K | 3 | TLB + L1 |
| 192 K | 12 | +9 (L2) |
| 512 K | 17 | +5 (L1 TLB miss) |
| 2 M | 57 | +40 (L3) |
| 6 M | 91 | +34 (L2 TLB miss) |
| 48 M | 91 + 60 ns | +RAM |
| ... | 121? + 60 ns | +? (PDE cache miss) |
16-bytes range cross penalty = 3 cycles.
L1 B/W (Parallel Random Read) = 0.55-0.60 cycles per one access (it's more than 0.50 due bank conflicts)
L2<->L1 B/W (Parallel Random Read) = 8 cycles per cache line in each direction
L2<->L1 B/W (Seqential Read or Write with any stride) = 8 cycles per cache line in each direction
L2<->L1 B/W (Seqential Read / pointer chasing / 4,8, 16 bytes step) = 3.05 cycles per access
L2<->L1 B/W (Seqential Read / pointer chasing / 32 bytes step ) = 5.22 cycles per access
L2<->L1 B/W (Seqential Read / pointer chasing / 64 bytes step ) = 9.20 cycles per access
L2<->L1 B/W (Seqential Read / pointer chasing / >64 bytes step ) = 15 cycles per access
L3<->L1 B/W (Parallel Random Read) = 18 cycles per cache line
L3<->L1 B/W (Seqential Read or Write with any stride) = 19 cycles per cache line
RAM Read B/W (Parallel Random Read) = 18 ns / cache line = 3550 MB/s
RAM Read B/W (Read with 8 Bytes stride) = 5400 MB/s ?
RAM Read B/W (Read with 64 Bytes stride) = 6160 MB/s ?
RAM Read B/W (Read with 4 Bytes stride - pointer chasing) = 2900 MB/s ?
RAM Read B/W (Read with 64 Bytes stride - pointer chasing) = 4100 MB/s ?
RAM Write B/W (4 Bytes stride) = 4500 MB/s ?
RAM Write B/W (64 Bytes stride) = 6170 MB/s ?
Branch misprediction penalty = 12 cycles.