Hello,
Currently I am developing on 2 custom boards with a identical layout. The difference is the used processor.
One board has a iMX6S and the other board a iMX6Q processor. Both boards have the same DDR configuration so the chips (MT41K128M16JT-125:K) and layout (32-bit) are identical. The DDR on the boards are independently calibrated.
However when running "bw_mem" (part of lmbench) I get very different results as the table below shows.
The 'bzero' test for instance is 6x slower on the Quadcore then on the Solo.
| Command | iMX6 Solo | iMX6 Quadcore |
|---|
| bw_mem -P 1 -N 4 128M rd | 1417.69 | 1318.39 |
| bw_mem -P 1 -N 4 128M wr | 467.34 | 373.44 |
| bw_mem -P 1 -N 4 128M rdwr | 486.82 | 397.27 |
| bw_mem -P 1 -N 4 128M cp | 460.50 | 342.82 |
| bw_mem -P 1 -N 4 128M fwr | 2178.06 | 370.24 |
| bw_mem -P 1 -N 4 128M frd | 1158.55 | 622.61 |
| bw_mem -P 1 -N 4 128M fcp | 768.31 | 317.41 |
| bw_mem -P 1 -N 4 128M bzero | 2175.32 | 339.56 |
| bw_mem -P 1 -N 4 128M bcopy | 770.06 | 355.44 |
Does anyone know why there is such a big difference between the Solo and Quadcore with identical DDR configuration?
