VERY predictable latency... 64 seconds to be exact

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09 Feb 2010 20:33 - 09 Feb 2010 20:39 #1845 by joegreen
Over the past few months I have been converting an old CNC router project using TurboCNC to a much more sturdy Bridge Mill with EMC2.

I found an IBM T43 laptop with a built in parallel port that is working great... except for one small issue. Every 64 seconds my latency (as measured by the EMC2 Latency checking program) jumps from ~7500 to ~68,000. If I happen to be jogging an axis or two when that 64 second latency spike hits the axis stalls.

I have turned off every thing that I can think of in the BIOS just to see if it influenced the 64 second time interval but to no avail..

Any Ideas?




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Last edit: 09 Feb 2010 20:39 by joegreen.

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09 Feb 2010 20:53 #1846 by acemi

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09 Feb 2010 21:17 #1849 by joegreen
Thanks Acemi.. I'll try that tonight..

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09 Feb 2010 21:34 #1850 by alex_joni

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09 Feb 2010 21:53 #1851 by joegreen
Can anyone offer any insight on the overheating issue?
Will my internal fan be disabled? Or just never come on?

Should I force air through the system externally ? Or just not worry about it?

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10 Feb 2010 11:06 #1854 by alex_joni
Usually it works with the fan stuck at high speeds.
I used a PC with SMI off without issues for a longer period of time, but there's no guarantee that your will too..
You have to try it for a while, then at least reboot and check the temperature in BIOS.
Most BIOS'es have an option to set a max temperature and shutdown the PC to prevent damage.

Regards,
Alex

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10 Feb 2010 17:39 #1857 by joegreen
Success!!

Latency never exceeded ~15,000 after an hour.

The fan seems to be running as normal. Not too fast.. not too slow. Just a moderate warm breeze wisping out of the heat exchanger.

Thanks for your help!

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