Kayla (1.4 GHz ARM Cortex A9)
Kayla has four ARMv7 Cortex A9 cores. These are narrow out-of-order processors running at 1.4 GHz.
- blue (unit-stride)
- green (cache-line stride)
- red (random stride)
- Kayla lacks prefetchers (random stride and cache-line stride performance is identical)
- the L1 data cache is 32 kB, access latency is 2.85 ns (exactly 4 cycles for a 1.4 GHz clock)
- the L2 cache is 1 MB, access latency is ~20 ns.
- off-chip DRAM access latency is ~145 ns.
Performance becomes muddled around 512kB-1MB. According to the ARM Cortex A9 manual, the TLB is at most 128 entries, which provides a TLB reach of 512kB. A single core attempting to access more than 512kB will see at least some performance degradation.
Performance is comparable, if a little worse, than Rocket.
| Add/Mul Mix | Adds Only | |
|---|---|---|
| MFLops | 788.9 | 955.7 |