[uClinux-dev] M5208 & dhrystone

[Bob Furber]

Hi Eric,

Have you enabled cash?

Bob Furber

> -----Original Message-----
> From: uclinux-dev-bounces at uclinux.org
> [mailto:uclinux-dev-bounces at uclinux.org]On Behalf Of Eric BENARD
> Sent: February 15, 2007 9:19 AM
> To: uClinux development list
> Subject: [uClinux-dev] M5208 & dhrystone
> 
> 
> Hi,
> 
> I'm using uClinux with kernel 2.4.32 and compiler 4.11-30 from
> Codesourcery on a M5208EVB.
> I compiled dhrystone using the following CFLAGS :
> CFLAGS="-O2 -Wa,-memac -Wa,-mcpu=5208 -mcpu=5208 -DNO_PROTOTYPES=1"
> (I also tried with much more complete CFLAGS).
> 
> I ran dhrystone on this board and got this poor result :
> Microseconds for one run through Dhrystone:   40.1
> Dhrystones per Second:                      24937.7
> which means 14 DMIPS (the CPU runs at 166MHz and is expected - by the
> shortform - to give up to 159 DMIPS).
> I understand the OS eats a few DMIPS but I don't understand why I only
> get 1/10th of the expected CPU power of this CPU.
> 
> Do you have any idea of what could be wrong ?
> 
> Many thanks and best regards
> Eric
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