Ubuntu Bugs steppgen in 10.04

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14 Mar 2011 12:36 #7812 by andypugh
Was that a completely stock 8.4 installation, or had you perhaps configured the SMI fix (which would need re-doing after a reinstall)?

You could try isolcpus, that normally leads to some improvement in latency, though that seems unlikely to be a real fix of the underlying problem.
Instructions here: www.linuxcnc.org/component/option,com_ku...0/lang,english/#6955
Is this a software-stepping machine? If you are using external hardware (Mesa, Pico, Pluto) and have no base thread then 60uS might be borderline acceptable. If you do have a base thread and are using software signal generation then the problem does need solving.

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14 Mar 2011 15:44 #7814 by mduzi
Thx Andy.
isolcpus tip did not help to better latency... :(
Instalation v10.04 is new from liveCD no upgrade.
yes, I using MESA boards.
The all machines have stepper motors.

The basic question?
why 8.04 work -> 10.04 not work
I tried basic config "hm2-stepper" and still error "join x following error"
EMC2 ver 2.4.6 is better than master 2.6.pre-0

Thx for all help
Martin

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14 Mar 2011 16:45 #7815 by PCW
What are the FERROR and MIN_FERROR values in units of steps?

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14 Mar 2011 18:10 #7816 by mduzi
standard like in 8.04
FERROR = .1
MIN_FERROR = .01
When 10x larger -> also error...
I think it now makes all of us...

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14 Mar 2011 18:26 #7817 by PCW
can you diff the ini and hal files?

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14 Mar 2011 19:04 #7818 by mduzi
PCW wrote:

can you diff the ini and hal files?

None, we are errors in the original configuration hm-stepper.
Can you also try ...

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14 Mar 2011 19:17 #7819 by cmorley
My case is a little simpler.
I have always used master on 8.04 for testing on my little mill.
At some point something changed as now I can't even jog it far without it follow erroring.
The big problem is I'm, not sure when it changed. i hadn't tested in a while.
using mesa 5i20 boards hardware steppers.
I guess I should try using 2.4 see if there is a difference.

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14 Mar 2011 19:27 #7820 by mduzi
cmorley wrote:

My case is a little simpler.
I have always used master on 8.04 for testing on my little mill.
At some point something changed as now I can't even jog it far without it follow erroring.
The big problem is I'm, not sure when it changed. i hadn't tested in a while.
using mesa 5i20 boards hardware steppers.
I guess I should try using 2.4 see if there is a difference.

You are using Ubuntu 8.04 and EMC> 2.5?

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14 Mar 2011 19:53 - 14 Mar 2011 19:54 #7821 by cmorley
yes I use it for development of pncconf
Last edit: 14 Mar 2011 19:54 by cmorley.

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14 Mar 2011 19:55 #7822 by PCW
so you are saying that the hm2-stepper.ini file on the working system is identical to the hm2-stepper.ini file on the non-working system?

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