Hi All, I have been trying to track down a 155ms real-time delay that occurs every 10 minutes. This is on an Intel motherboard and 2.x GHz celeron processor. With a PATA hdd and through the parallel port it has been running a stepper machine for some time without problems.(Ubuntu 6.06 and emc2.0.x)
Now the PATA drive died and I replaced it with a SATA drive and also added a m5i20 for servo control. Now on Ubuntu 8.04 and emc2.2.4/5 The 155 ms real-time delay obviously results in following errors with the servos hooked up, and with sim_inch.ini I can also hear a clear gap in the pc-speaker tone (this ini routes the step signal to the pc-speaker). The delay is 155-156 ms every time and occurs every 10 minutes (+/- 20s, I did not time it that accurately). I tried installing the rtai_smi.ko module, but insmod returns an error because it does not recognize my motherboard. I have disabled a lot of stuff in the BIOS, but the delay remains (at least these are off: Parallel port, Ethernet, On-board video, USB) At some point I thought it was a video problem. I have a geforce 8200 based card and it works OKish with either 'vesa' or 'nv' drivers and not at all with 'nvidia' drivers. Changing graphics driver doesn't help with the delay. One clue might be "Clocksource tsc unstable (delta= 154621535 ns)" and "Time: pit clocksource has been installed" which shows up in dmesg or syslog. There was not a clear opinion/suggestion on IRC what to do about this. Has anyone else seen something like this? any suggestions? One additional strange thing is that 'latency-test' and emc work OK until the delay hits, but the latency test that comes with the kernel at kernel-.../testsuite/kern/latency/run only shows the first 5-lines of output at first (stars and the "Type ^C" text and just hangs there forever. When I press cltr-C I get one line of values, often very large and negative in the first columns and then very large and positive in the other cols. Anders ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
