[ECOS] Performance problem mpc8xx

[ECOS] Performance problem mpc8xx

[Daniel.Andersson]

Hi,

I am having some performance problem on my MPC850 board. When i setup a very
small main that only executes like 100 asm instruction then it takes around
6-7 times the teoretically time. My first thought was that the caches wasnt
turned on but when i turned them off - before my short loop - as a test,
then i got a further decrease of performance (3.5 times).

Does anybody have any ideas of what maight be wrong here?

/Daniel

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Re: [ECOS] Performance problem mpc8xx

[Christoph Csebits]

Hi,

On Fri, May 17, 2002 at 09:50:24AM +0200, Daniel.Andersson@combitechsystems.com wrote:
> I am having some performance problem on my MPC850 board. When i setup a very
> small main that only executes like 100 asm instruction then it takes around
> 6-7 times the teoretically time. My first thought was that the caches wasnt
> turned on but when i turned them off - before my short loop - as a test,
> then i got a further decrease of performance (3.5 times).
> 
> Does anybody have any ideas of what maight be wrong here?

If you are you executing out of RAM, maybe your RAM isnt
initialized at its optimum. (shot in the blue)

good luck, christoph

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Re: [ECOS] Performance problem mpc8xx

[Jesper Skov]

On Fri, 2002-05-17 at 09:50, Daniel.Andersson@combitechsystems.com
wrote:
> Hi,
> 
> I am having some performance problem on my MPC850 board. When i setup a very
> small main that only executes like 100 asm instruction then it takes around
> 6-7 times the teoretically time. My first thought was that the caches wasnt
> turned on but when i turned them off - before my short loop - as a test,
> then i got a further decrease of performance (3.5 times).
> 
> Does anybody have any ideas of what maight be wrong here?

Could be serialization which has not been switched off. It prevents the
CPU for executing more than one instruction at the time. I'm pretty sure
we switch that off in the 8xx HAL though.

Something else: we had an internal bug on bad dhrystone performance on
the 850. It's closed now, and turned out to be due to the caches not
being set up correctly. I don't know exactly what the fix was. But you
can look for it in eCos V2...

Jesper



Jesper


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[ECOS] Build error: No such host or network path

[afei]

Hi,

I installed the eCos1.31 for windows and was trying to build the
tests, the arm-elf-gcc version is 2.95.2, then I got the errors as
following.
Anyone know about this problem please help.
thanks,

AFei

===================================
*** Process 2192 created "make tests -j1"
make -r -C hal/arm/arch/v1_3_1 headers
make[1]: Entering directory `/sample/test_build/hal/arm/arch/v1_3_1'
makefile:91: //C/PROGRA~1/REDHAT~1/eCos/packages/pkgconf/rules.mak: No such
host or network path
make[1]: stat://C/PROGRA~1/REDHAT~1/eCos/packages/pkgconf/rules.mak: No such
host or network path
make[1]: *** No rule to make target
`//C/PROGRA~1/REDHAT~1/eCos/packages/pkgconf/rules.mak'.  Stop.
make[1]: Leaving directory `/sample/test_build/hal/arm/arch/v1_3_1'
make: *** [headers] Error 2

*** Process 2192 terminated (rc=259)
*** Killing process 2192 (TerminateProcess)



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Re: [ECOS] Performance problem mpc8xx

[Alfredo]

> Something else: we had an internal bug on bad dhrystone performance on
> the 850. It's closed now, and turned out to be due to the caches not
> being set up correctly. I don't know exactly what the fix was. But you
> can look for it in eCos V2...
> 
> Jesper

Hi.

 When is going to be available this release of eCos (ecos v2.0)? 

Regards.

Alfredo.


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Re: [ECOS] Build error: No such host or network path

[Jonathan Larmour]

afei wrote:
> 
> Hi,
> 
> I installed the eCos1.31 for windows and was trying to build the
> tests, the arm-elf-gcc version is 2.95.2, then I got the errors as
> following.
[snip]
> make[1]: *** No rule to make target
> `//C/PROGRA~1/REDHAT~1/eCos/packages/pkgconf/rules.mak'.  Stop.
> make[1]: Leaving directory `/sample/test_build/hal/arm/arch/v1_3_1'
> make: *** [headers] Error 2

You need to use the update configuration tools that you can download from
this page: http://sources.redhat.com/ecos/anoncvs.html

Jifl

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Re: [ECOS] Build error: No such host or network path

[Jonathan Larmour]

"???????? ?.?." wrote:
> 
> Hi, i do it and after update i got the errors
> 
> make[1]: Entering directory
> `/ecos-e/ecostests/i386_6_build/hal/common/v1_3_1'
> mkdir: e:: Filename too long
> make[1]: ***
> [/ecos-e/ecostests/i386_6_install/include/cyg/hal/dbg-thread-syscall.h]
> Error 1
> make[1]: Leaving directory
> `/ecos-e/ecostests/i386_6_build/hal/common/v1_3_1'
> make: *** [headers] Error 2
> make: Leaving directory `/ecos-e/ecostests/i386_6_build'

That looks very odd. I haven't seen that before. At a bash prompt, can you
do a "mkdir -p /ecos-e/ecostests/i386_6_install/include/cyg/hal/" yourself?

It looks like some sort of cygwin problem.

Jifl
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