|Andy Hearn wrote:|
A Sonnet card loaded with 256 meg ram, a PPC 7410 CPU - G4 @450Mhz generates the following numbers in amiga SysSpeed
The problem of SysSpeed is that the executed "workload" the done code - on PPC and on 68K is not the same.
So you have you compare 2 different CPUs properly - if you NOT do the same work on them?
And even if you do the same work, how do you then count MIPS?
If you now for example see that for
this 68K instruction
The PPC code needs comparable 3 instructions
ADD #1, Rm
Its the same work done, but 3 times the number of instructions.
What does SysSpeed count here 1 or 3?
You can see comparing cross CPU architecture is complex topic,
I know this I have written CPU PowerPC benchmarks at IBM.
What is much easier to measure are real life workloads.
For example run BUSTEST and see how fast memspeed is.
It does not matter if the 68K needs halve the instruction to do the job - so not count instructions or Mips, count the result.
Count the MB/sec
So run your SONNET and look at BUSTEST scores to see "real life performance".
Or display a JPEG .. such numbers are much more real to measure.