Re: [microblaze-uclinux] OT?, Performance

[David McCullough <davidm@xxxxxxxxxxxx>]

Jivin emanuel stiebler lays it down ...
> jozsef imrek wrote:
> 
> >On Wed, 12 May 2004, emanuel stiebler wrote:
> >
> >>Anybody had some thoughts already, why there is such a BIG
> >>difference between the numbers on xilinx web, and the dhrystones
> >>we measure here ?
> >
> >i guess those numbers are for fpga's with speed grade 6, while
> >for example i have an fpga with speed grade 4. that might be a difference.
> 
> Between the "grades" there is a difference of few percent.
> I'm talking about a difference bewteen 600 KMIPS and 50 KMIPS ...
> 
> >i want to try to 'overclock' my board. have any of you tried to do so?
> 
> Don't see a reason to get few percent of performance, and
> loose the stability for it.

I can't comment on the xilinx specifically,  but I can say that there
has always been a significant difference between the dhrystone numbers
motorola post for their Coldfire and the numbers we get from the
dhrystone application running under uClinux.

I think they run it from the internal SRAM (0 wait states) for a start,
and use a different compiler, but I don't think anyone has duplicated the
results they get.

Could be a case of very specific and careful benchmarking to get those
numbers :-)

Cheers,
Davidm

-- 
David McCullough, davidm@snapgear.com  Ph:+61 7 34352815 http://www.SnapGear.com
Custom Embedded Solutions + Security   Fx:+61 7 38913630 http://www.uCdot.org
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