Hi Jack, you were pretty close :)
You need to load the modified module (sudo modprobe rtai_smi) and then run the latency test again. If that works you will need to change the /etc/emc2/rtapi.conf and add rtai_smi to the list of modules to load for RTAI3 (in the line with adeos, rtai_* & co) Regards, Alex On Tue, 2007-03-13 at 15:49 -0400, Jack Ensor wrote: > My PC uses an Intel motherboard running at 1.5Ghz and 256mb of ram doesn't > like > EMC2 apparently because of excessive overruns. > > Looking at http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?TroubleShooting > it tells me to look for: > > ubuntu:$ ls -l /dev/rt* > lrwxrwxrwx 1 root root 8 2006-05-23 23:34 /dev/rtai_shm -> RTAI_SHM > crw-rw---- 1 root audio 10, 135 2006-05-14 16:12 /dev/rtc > > When I do I get: > > [EMAIL PROTECTED]:~$ ls -l /dev/rt* > crw-rw---- 1 root audio 10, 135 2007-03-12 19:03 /dev/rtc > crw-r--r-- 1 root root 150, 3 2007-03-13 08:13 /dev/rtf3 > [EMAIL PROTECTED]:~$ > > and it says I should see this: > > fedora]$ ls -l /dev/rt* > crw-rw-rw- 1 root root 10, 254 Jul 18 2005 /dev/rtai_shm > crw-r--r-- 1 root root 10, 135 Jun 4 16:21 /dev/rtc > crw-rw-rw- 1 root root 150, 0 Jul 18 2005 /dev/rtf0 > crw-rw-rw- 1 root root 150, 1 Jul 18 2005 /dev/rtf1 > crw-rw-rw- 1 root root 150, 2 Jul 18 2005 /dev/rtf2 > crw-rw-rw- 1 root root 150, 3 Jul 18 2005 /dev/rtf3 > crw-rw-rw- 1 root root 150, 4 Jul 18 2005 /dev/rtf4 > crw-rw-rw- 1 root root 150, 5 Jul 18 2005 /dev/rtf5 > crw-rw-rw- 1 root root 150, 6 Jul 18 2005 /dev/rtf6 > crw-rw-rw- 1 root root 150, 7 Jul 18 2005 /dev/rtf7 > crw-rw-rw- 1 root root 150, 8 Jul 18 2005 /dev/rtf8 > crw-rw-rw- 1 root root 150, 9 Jul 18 2005 /dev/rtf9 > > If these files do not exist, you can create them, for example: sudo mknod > /dev/RTAI_SHM c 10, 254; > > So I did: > > [EMAIL PROTECTED]:~$ sudo mknod /dev/RTAI_SHM c 10, 254; > Password: > [EMAIL PROTECTED]:~$ ls -l /dev/rt* > crw-rw---- 1 root audio 10, 135 2007-03-12 19:03 /dev/rtc > crw-r--r-- 1 root root 150, 3 2007-03-13 08:13 /dev/rtf3 > > [EMAIL PROTECTED]:~$ ls -l /dev/RTAI_SHM > crw-r--r-- 1 root root 10, 254 2007-03-13 14:39 /dev/RTAI_SHM > [EMAIL PROTECTED]:~$ > > So the other files rtf0 - rtf2, and rtf4 through 9 are still missing. > > When I run the latency test I get: > > ## RTAI latency calibration tool ## > # period = 100000 (ns) > # avrgtime = 1 (s) > # do not use the FPU > # start the timer > # timer_mode is oneshot > > RTAI Testsuite - KERNEL latency (all data in nanoseconds) > RTH| lat min| ovl min| lat avg| lat max| ovl max| overruns > RTD| -938| -938| -131| 7823| 7823| 0 > RTD| -997| -997| -123| 6605| 7823| 0 > RTD| -930| -997| -145| 6552| 7823| 0 > > <Snip > > RTD| -982| -1005| -116| 7708| 206073| 5 > RTD| -990| -1005| -122| 7561| 206073| 5 > RTH| lat min| ovl min| lat avg| lat max| ovl max| overruns > RTD| -982| -1005| -120| 7628| 206073| 5 > RTD| -1005| -1005| -111| 9621| 206073| 5 > RTD| -975| -1005| -16| 10413| 206073| 5 > > with an overrun occuring approximately every 62 secs or so. > > So I goto > > http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?FixingDapperSMIIssues > > and they explain that I need to replace > /usr/realtime-2.6.15-magma/modules/rtai_smi.ko > > with the downloaded rtai_smi.ko they offer. (Alternative: grab the binary > (for > Ubuntu 6.06-Dapper Drake only) from [[here]]). > > So to be sure that I don't lose the current file I do: > > sudo cp /usr/realtime-2.6.15-magma/modules/rtai_smi.ko > /usr/realtime-2.6.15-magma/modules/rtai_smi1.ko > > and then: > > sudo cp /home/jack/Downloads/rtai_smi.ko > /usr/realtime-2.6.15-magma/modules/rtai_smi.ko > > Then I run the latency test and find that nothing has changed. So I then put > the original file back. > > So now I am at a loss as to what my next step should be. Any ideas short of > looking for a different motherboard? > > Jack Ensor > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys-and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
