Energy Drink wrote:
> My computer is an IBM ThinkPad 700Hz laptop with 256MB of memory. The
> software is Ubuntu and EMC2 2.1.6.
>
> The problem is that I do get an (Unexpected realtime delay) error when I
> start EMC2 and the servo starts to stepp by itself (~3 steps/sec). I can
> use the program, but it drives the servo by mixing the command and the
> unwanted steps??
>
> THE DMESG:
> [ 700.559768] Bluetooth: RFCOMM ver 1.7
Bluetooth seems like a real bad idea in a machine tool environment.
> [ 731.643791] ISO 9660 Extensions: Microsoft Joliet Level 3
> [ 733.616228] hdc: media error (bad sector): status=0x51 { DriveReady
> SeekCompl ete Error }
I guess hdc is the CD ROM drive, but these are uncorrectable
read errors on the CD - not good.
> [ 775.327307] 994: ERROR: Unexpected realtime delay: check dmesg for
> details.
> [ 775.327325]
> [ 775.327328] In recent history there were
> [ 775.327332] 689463, 688776, 689337, 688922, and 688865
> [ 775.327336] elapsed clocks between calls to the motion controller.
> [ 775.327354] This time, there were 4894008 which is so anomalously
> [ 775.327358] large that it probably signifies a problem with your
> [ 775.327362] realtime configuration. For the rest of this run of
> [ 775.327367] EMC, this message will be suppressed.
If I understand these numbers correctly, that is a significant
fluctuation in the time it took to complete the motion thread.
On many systems, it is due to the video card, so you might try
changing the video settings. Sometimes it is better to let the
user-mode software do some of the graphics trickery than have
the driver doing it at high priority. You can't change the
video card itself on a laptop, which is a restriction. There
are options on the video setup (I know how to do this on KDE,
but am still finding my way around Ubuntu.)
Jon
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