Concurrency penalty
Posted: Sun May 16, 2021 4:36 pm
Hello to you all.
Working on a personnal project, I was able to benchmark the penalty of the Master / Slave concurrency Bus Access.
As you know, when Master and Slave both want to access the bus, the Master has the priority, and the Slave can access the bus when it receives the permission to do it.
My test code was:
Running this same slice of code on both Master and Slave gave me this result:
concurrency between Master and Slave makes the Slave between 6 an 10% slower.
Your mileage may vary.
Tested on real PAL hardware.
I thought this could help ^^
Working on a personnal project, I was able to benchmark the penalty of the Master / Slave concurrency Bus Access.
As you know, when Master and Slave both want to access the bus, the Master has the priority, and the Slave can access the bus when it receives the permission to do it.
My test code was:
Code: Select all
!loop:
MOV.W R12,@R1 ; Write to DRAM
ADD #1,R9
CMP/HI R9,R13
BF/S !rarely
ADD #2,R1
DT R11
BF/S !loop
MOV.W @R10+,R12 ; Read from SDRAMconcurrency between Master and Slave makes the Slave between 6 an 10% slower.
Your mileage may vary.
Tested on real PAL hardware.
I thought this could help ^^