On Saturday 27 September 2008, Peter Boyer wrote: >Hi all, > >This is a first time posting so excuse my newbie-like characteristics. I >just finished building a CNC router and am using EMC2 to control it on a >Hardy Heron install. My computer is a P4 1.8Ghz Desktop, Matrox Video Card, >with 512 MB ram. Presumably, I have an intel chipset. > >On my first occasion running the software on my router, I got the dreaded >"Unexpected realtime delay; check dmesg for details" error. I ran the "RTAI >latency calibration tool" and observed the kind of 64 second periodic ~150 >ms increases increases in latency typical of an SMI (System Mangement >Interrupt) issue. After finding an article on the EMC2 wiki directly >relating to turning off SMI, I felt very happy and proceeded to implement >the solution. > >I "implemented the solution" by opening rtapi.conf and editing the file >exactly as detailed in the wiki article called "Fixing Realtime problems >caused by SMI on Ubuntu." I was somewhat confused by the article when it >told me to skip to step 6, which instructs the user to copy the rtai_smi.ko >module to the appropriate directory - as I understand it, I didn't need to >do this on a Hardy Heron install as the module is already present. After >installing the module, I ran EMC2 and gave the system a lsmod and saw that >the rtapi_smi.ko was running as expected. > >HOWEVER, I still have (seemingly) the same latency issues as I had before. >I still get the "Unexpected realtime delay; check dmesg for details" error. > >SO, my questions are: > >1) Is there some other similar form of latency that would cause this same >problem? >2) Might I need to actually compile another rtapi_smi.ko module in order to >fix the problem? >3) I did just do something flat out wrong when I tried to fix the problem? > >4) What is ACPI and APM? (I have not attempted to turn it off yet.) > >I'm pretty frustrated and don't really know where to turn. Any ideas? > >All the best, >Peter
I don't know if this has any bearing or not for you, but I have an nvidia card on my emc box, and had to switch it to use the vesa driver to get that under control. The nvidia binary blob was truly terrible, the nv driver was better, and the vesa driver was the best. ACPI & APM are, I believe, already turned off in the kernel you should use to run emc, if they are on, then again there will be IRQ caused latencies. -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Support your local church or synagogue. Worship at Bank of America. ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
