CPU Speed - memcpy

Y tck

Other Parts Discussed in Thread: AM3359

Hi,

I do a test for the speed of AM335x,copy 10 MBytes data using “memcpy”.

The Environment:

CPU :AM3359

CORE: 720MHZ

DDR2:266HMZ(532M data rate)

memcpy srouce:DDR2,destination:DDR2

MMU:on,CACHE:off

The code based on startware.

Result:memcpy 10-Mbyte data takes 479ms.

Is there any optimization option which can be do to increase the speed ?

0 Laxmi Dhoolashetti over 12 years ago

Hi,

Did you try by enabling cache? If not, Can you try by enabling cache?

Please let me know the speed status with cache.

0 Y tck over 12 years ago in reply to Laxmi Dhoolashetti

Hi,Laxmi

Since I want to test the speed of the DDR and CORE,I disable the cache.

0 Radhesh Bhat over 12 years ago in reply to Y tck

Genius 4590 points

HI,

I guess "memcpy" may not be the optimized version (you may be using RTS lib, correct me if I am wrong).

Instead you should try using for loop with double word precision since DSP is capable of transferring those many.

Processors forum