I have just bought a few of these, out the box (LCNC 2.4.3 and 2.5) I am getting jitter in the 5000ns range, are you saying that without the hyper threading turned off, the jitter is really much higher? I haven't connected a motor to see test it and I don't get any RT errors while playing.
Greg ----- Original Message ----- From: "Gene Heskett" <ghesk...@wdtv.com> To: <emc-users@lists.sourceforge.net> Sent: Tuesday, July 24, 2012 7:18 PM Subject: Re: [Emc-users] BASE_PERIOD and Intel D525MW boards > On Tuesday 24 July 2012 13:11:56 John Stewart did opine: > >> Gene, Andy: >> >> Andy; I thought it was reliable, too…. (read on) >> >> > I have 2 of them, running at 23000 ns for a BASE_PERIOD. I can run >> > most of the day without encountering a realtime error. >> >> Good - I'll try your BASE_PERIOD - (read on) >> >> > I assume you also have the option set in the kernel line of your >> > grub.conf >> >> Thanks for the "slap on the back of the head" . Let me check that - I >> did but it might have been removed by some machine updates. > > And don't forget to turn off that time waster in the bios called > hyperthreading. A quick test for that is to check and see how many cpu's > the machine _thinks_ it has, running htop for instance. If its not been > disabled, it will show 4 cores, but the machine is actually faster with > that turned off as the bios code wastes 10% of the machines cycles doing > needless context swaps. A solution of sorts that when running linux, will > never find the problem it is supposed to fix. > >> > Going to 23000 will make a noticeable difference in the machines >> > >> > top speed in that event. >> : >> :-) >> : >> > That also assumes you have stepper voltages high >> > enough to make decent torque at those speeds. 24 is often borderline >> > IMO, my mill is running a 28 volt supply, my lathe a 38 volt under >> > load. >> >> Running at circa 42V - G540, calculated optimal voltages from equations >> on gecko web site, and tuned my power supply to that. > > Custom wound transformers? > >> It's a little Sieg KX1 with a Gecko G540. >> >> I'll verify that isoclplus (name like that) parameter, and try your >> BASE_PERIOD and email back in a couple of days with results. >> >> Thanks; >> >> JohnS. > > NP :) > > 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) > My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! > I tripped over a hole that was sticking up out of the ground. > > ------------------------------------------------------------------------------ > 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 > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.455 / Virus Database: 271.1.1/5144 - Release Date: 07/20/12 18:17:00 ------------------------------------------------------------------------------ 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
