Hi,
We found the following document on Cortex-A9 performance.
List of ARM microarchitectures - Wikipedia, the free encyclopedia
Which claims 2.5 DMIPS/MHz per core for Cortex-A9 2GHz@2 core. However, our Dhrystone result on Cortex-A9 1.2GHz@2 core only showed roughly 1 DMIPS/MHz per core.
We downloaded the Dhrystone benchmark from the following link and cross-compiled it with gcc version 4.5.2.
dhrystone 2.1 - Download, Browsing & More | Fossies Archive
We realize that Dhrystone measurements will vary due to differences in compilers and OS. And I would like to know whether our result is reasonable or not?
Best,
Ying
It seems that the benchmark is tainted by compiler. I am not using armcc.
The compiler is gcc version 4.5.2 (Sourcery G++ Lite 2011.03-41) and the Linux kenel is 3.4.5.
The results and the flags are as follows.
DMIPS/MHz/core=0.49 with flags of -O0 -DTIME -march=armv7-a
DMIPS/MHz/core=1.07 with flags of -O1 -DTIME -march=armv7-a
DMIPS/MHz/core=1.31 with flags of -O2 -DTIME -march=armv7-a
DMIPS/MHz/core=1.37 with flags of -O3 -DTIME -march=armv7-a
I was wondering what compiler flags should I use?
Notably, all of them are much lower than the official 2.5 DMIPS/MHz/core...