Dear Lennart Sundberg,
In message <aanlktik6wti_dtflspft+y_zthfsz-xrqx4tf8h_l...@mail.gmail.com> you
wrote:
>
> I am trying to implement a memory and CPU demanding standalone application
> on the beagleboard by hacking U-Boot.
>
> To my surprise, the U-Boot program is ten times slower than the same
> program running under Linux on the beagleboard.
This is not a surprise...
> U-Boot version = u-boot-2010.09
...given that old version of U-Boot.
In that old code, U-Boot was running with cahces disabled, which
explains the poor performance you see.
Update and use recent code instead. This will include this commit
then:
commit 95c6f6d34d4ff23f4d005488d84682eec5fa9ec8
Author: Heiko Schocher <h...@denx.de>
Date: Fri Sep 17 13:10:31 2010 +0200
ARM V7 (OMAP): add data cache support, test on Beagle board
Add data cache support for ARM V7 systems. Used cache flush
functions from linux:arch/arm/mm/cache-v7.S developed from
Catalin Marinas.
Enable "cache" command on Beagle board and test performance.
Test 1: Loading 127 MB of data from NAND flash into RAM:
Instr. Cache off on on
Data Cache off off on
--------------------------------------------------
Beagle (Cortex A8) 116s 106s 30.3s = x 3.8
Test 2: uncompressing a gzipped image from RAM to RAM
(size compressed: 6.5 MiB, uncompressed: 35 MiB):
Instr. Cache off on on
Data Cache off off on
--------------------------------------------------
Beagle (Cortex A8) 1.84s 1.64s 0.12s = x 15.3
Portions of this work were supported by funding from
the CE Linux Forum.
Signed-off-by: Heiko Schocher <h...@denx.de>
Reviewed-by: Ben Gardiner<bengardi...@nanometrics.ca>
As you can see, CPU and memory bound executin may improve by a factor
of 15 or so ...
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de
I'm a programmer: I don't buy software, I write it.
-- Tom Christiansen
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