[Emc-users] linux forum

[Fred]

Hello Chaps

I am looking for a linuxcnc forum to belong to.

I found this mailing list which is sending me dozens of emails every day .

Unfortunately I cant give the mailing list my attention because of work
commitments

My Question .

Is there a linuxcnc forum that runs like a classical forum that one can
belong to and browse

the topics at your leisure??



best regards



Fred Evans
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Re: [Emc-users] unexpected realtime delay

[Fred Kehler]

the newer grub is quite different from the older

On my 10.04 I had to edit the /etc/default/grubfile to look like this

#ORIGINAL LINE WAS
>GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
>GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1"

and then run >sudo update-grub

the kernel now boots with the isolcpus=1

hope this helps...



On Sat, Apr 2, 2011 at 7:23 AM, Steve Blackmore  wrote:

> On Sat, 02 Apr 2011 12:48:10 +0100, you wrote:
>
> > From the EMC Wiki:
> >
> >> Edit */boot/grub/menu.lst* and add *isolcpus* parameter to the end of
> >> the kernel line of the RTAI kernel.
> >> The value of the *isolcpus* parameter will be the number of the last
> >> core/CPU. Start to count from #0.
> >> 1 for dual core/CPU system, 3 for quad core/CPU etc...
> >>
> >> This is the kernel line for my dual core machine
> >> /kernel /vmlinuz-2.6.30.5-rtai root=/dev/sda5 ro *isolcpus=1*/
>
> Hi Les - there is no menu.lst file in my grub directory. I thought I'd
> read that grub changed with 10.04?
>
> Steve Blackmore
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Re: [Emc-users] unexpected realtime delay

[Fred Kehler]

great list!
I have had this error popping up all the time since I upgraded to the 10.04
distribution ( seldom on the 8.04, same computer)

and the isolcpu=1 seems to have solved it...

does it follow then that the second cpu in this case is not being managed by
the realtime kernel?

I am currently running my emc on the second core 'taskset 2 emc ***.ini',
and it seems impervious to the dreaded error message, regardless as to what
else I run on the machine...
but am I safe in running this way?  am I still getting realtime performance
on the core that has been isolated on bootup?

thank you to all the contributors!


On Tue, Mar 15, 2011 at 6:06 PM, Tom Easterday  wrote:

> I had this problem on my mill that has a D510 board in it.  I have not had
> the error pop up since disabling hyper threading in bios and adding isolcpus
> to the boot file.  FWIW...
> -Tom
>
> On Mar 15, 2011, at 3:22 PM, Joel Jacobs wrote:
>
> > Hi,
> > Is there any way to adjust the sensitivity or suppress this  error?  I
> > have an Atom D525 running the latest EMC2 from the repositories
> > (Ubuntu 10.04).  I have a Mesa 7I43 and Gecko 320 servo drives.  I
> > have no base thread at all, just the servo thread running at 700us. At
> > 1ms I would get random 'thunks' from the servo only while jogging the
> > X axis in the + direction at 120ipm. Minus X Jogs were smooth.
> > After adjusting the servo thread to 700us all motors are super smooth
> > no matter what.  Just randomly getting this error - sometimes takes an
> > hour to pop up.  Like I said, the motors are running great so I don't
> > really want to tweak the hyperthreading and isocpu= stuff.  I don't
> > understand why I'm getting this error with no base thread.  Thanks,
> > Joel Jacobs
> >
> >
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