On 7/25/2012 10:50 PM, John Stewart wrote: > Kent; > > It looks like I was wrong, but (if I'm correct this time!) running linuxcnc + > the RTAI stuff in core1 on my little D525MW seems to do the job quite well. > > It's been running a program for a couple of hours right now, and no issues. > > Q: Why, if there was "nothing" other than RTAI running on cpu1, did I get > real time errors, but adding linuxcnc to cpu1 made it run better? Where, > really, is the timing issue? > > Thank all of you for the replies and support and guidance. > > John Stewart. > >
I suspect the path to a satisfying answer lies in understanding the bottom of the page in http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RealTime which mentions the improvement in latency results obtained when running a "cpu hog" to prevent flushing RT code out of the cache. This is beyond the scope of my wiki entry, which addressed the narrow point of moving from classic Grub to Grub2. Honestly, though, I haven't thought about multi-core issues since I wrote my wiki entry 14 months ago, and I've already forgotten half of what I learned in the process. (Which makes me wonder why I'm trying to understand the issue of USB badness now. How long will it take me to forget whatever I might learn?) Regards, Kent ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
