RTAPI error and realtime delay at EMC launch

If you look at wiki.linuxcnc.org/cgi-bin/emcinfo.pl?Latency-Test you will see that that is about as good as it gets.

And I have no complaints at all...just trying to get the numbers that BigJohnT had reported. I'm very happy. I have *FINALLY* used the system to run my table...had to wait for a project...and it works great!

This system rocks and for only less than about 400 bucks, if memory serves, it was a great deal. EMC2 Live Disc loaded with no problems and the table config and Latency Test were smooth!

Very happy. I used the system to engrave/mark some aluminum plate for parts for the CNC Plasma table I'm building and it worked flawlessly.

Thank you for all who contributed.

--HC

I was getting the same error message and I had a very limited speed on my Sherline 4-axis CNC mill (<220mm/min ~ 8.6 inches/min).

After disabling legacy USB support in the BIOS, I'm still getting the error message, but I can run the stepper motor smoothly at over 3 times the speed! (720 mm / min ~ 28 inches / min).
I even had to edit the Sherline ".ini" file to up the maximum speeds because the GUI only allowed 480 mm / min.

Hello!

I just upgraded my CPU from Core2Duo E7500 to Xeon E5450. Everything seems to be working fine, except that I now have huge latency problems..

If idling, latency test shows reasonable ~20000ns values. But if I open Firefox, values go over 1000000ns easily. Also when just switching tabs in Firefox, or moving windows etc.

System is identical otherwise, just new CPU.

I have tried twiddling BIOS settings and all tricks described in this thread, but no improvement.

I can obviously switch back to E7500 CPU, but Xeon is so much faster otherwise. This is my daily desktop machine which is used to many other things as well besides CNC.

I tried disabling SMI, no difference.

Edit:

This is Lenovo A58 system, LinuxCNC 2.6.7, kernel 3.4-9-rtai-686-pae

I have a Xeon 5560 and I was having similiar issues, but disabling legacy USB support in the BIOS gave me perfectly smooth and quiet CNC drive, at speeds beyond the specs.
Have you tried to disable "legacy USB support"?
Also, you can try disabling hyperthreading.
I would definitely not do web browsing on the same machine while running a CNC mill...
You really need a dedicated machine.
Mine is also not connected to the network, for security.
You don't want to get some crazy Java script slowing down your machine while doing a cut, or someone hack into it and destroy your CNC machine.
Dangerous machinery hooked up to an internet-connected computer is asking for trouble, IMHO.
Just ask the Iranians!

The only safe computer is one that is physically disconnected...

gnagy wrote: I have a Xeon 5560 and I was having similiar issues, but disabling legacy USB support in the BIOS gave me perfectly smooth and quiet CNC drive, at speeds beyond the specs.
Have you tried to disable "legacy USB support"?
Also, you can try disabling hyperthreading.
I would definitely not do web browsing on the same machine while running a CNC mill...
You really need a dedicated machine.
Mine is also not connected to the network, for security.
You don't want to get some crazy Java script slowing down your machine while doing a cut, or someone hack into it and destroy your CNC machine.
Dangerous machinery hooked up to an internet-connected computer is asking for trouble, IMHO.
Just ask the Iranians!

The only safe computer is one that is physically disconnected...

Thanks for your answer!

Legacy USB is disabled, no effect. I can't toggle hyperthreading from the BIOS.. And actually I think this model Xeon does not even have HT?

I have had this computer (with core2duo) and CNC mill for several years now. I always surf the web and play Spotify music, or design circuit boards etc. Never had any problems.

If I don't open firefox and don't run any extra programs, latency test can run for hours and only shows under 20000 max jitter on both fields. So on a dedicated system it probably would work. But on dedidated system I wouldn't need the Xeon in the first place.

The problems is somehow related to graphics, I think. I can run very cpu-intensive programs from the shell, and jitter stays low. But just switch tabs in Firefox and boom, 1000000ns jitter.. I am running on integrated graphics which I know is a "no-no", but it did work just fine on the old CPU.