Re:
Quoted 6 lines · macrohat
Dear linux-mips:
Thanks!
So,Could I think that BCM1250 is not a type of high performance CPU? as in ARM or Power PC ARCH system,Bogomips is almost equal to CPU clock
Intel P4 has 2X Bogomips than the frequency:)
I think we could not conclude just by this: performance of a CPU is a complex topic,
its architects may think ALU latency is not important enough for them to implement
full bypass,instead put their energy on other issues.Nowadays, the memory hierarchy
performance often dominates.
Of course you can benmark it, for general purpose CPU, SPEC CPU2000 may be a good choice(www.spec.org)
and there are numerous other free benchmarks too.
Quoted 3 lines
frequency.Is there any way to inprove it with software?
The compiler may help a bit by scheduling instructions around.
Quoted 51 lines
Regards!
======= 2004-11-13 22:01:00 您在来信中写道：=======
Quoted 13 lines
Quoted 9 lines · macrohat
Hello linux-mips:
I have a question to ask you: why BCM1250 CPU Bogomips is so much lower than CPU clock frequency,such as:
CPU 700MHz - 465.30 Bogomips, CPU 800MHZ - 532.48 BogoMIPS.And i find out that CPU Bogomips is a fixed value regardless L2 cache open or closed,Quoted 21 lines
This indicates the ALU ops of that CPU have more than one cycle latency. To achieve higher frequency,
the pipeline is becoming longer...Bogomips calculation is a short loop which fits well in L1 caches, so L2 won't affect the performance.
Quoted 12 lines
Enclosed is the log from the console
Regards!
macrohat
[email protected]
2004-11-13macrohat
[email protected]
2004-11-13