On Friday 20 March 2015 04:14:13 Lisi Reisz wrote: > On Friday 20 March 2015 05:09:01 Gene Heskett wrote: [....] > And why can't you use more than 2G memory with Wheezy? I do! Or are > you running 32 bit hardware and is that the problem? > > Lisi
The boxes running the machines are Intel D525MW based, 64 bit dual core Atom cpus. Now out of production a year, they were pure magic for what we wanted to do when they came out. Equipt by default with a single 2G stick. They of course aren't as busy as this one, and I have yet to see one of them using swap. Put that exact same kernel on this machine and its a gig into swap just sitting here overnight collecting the mail. The default kernel is purported to be a 32 bit-pae, but pae doesn't work. The claim is made that the 64 bit stuff is not as fast as the 32 bit is at operations critical to running dangerous machinery. A 64 bit kernel has not ever been successfully patched by the RTAI patches. The guys who know, consider .001 seconds as being the absolute maximum between detecting a problem and issuing a corrective action including stopping it dead it its tracks. My lathe for instance is running that loop in .00025 second repetitions. Nyquist considerations for a stable spindle servo drive the higher speed for stability there. Its my understanding that the xenomai patch does work, if the critical high speed stuff is offloaded to a control card such as mesanet makes. I have one of those cards in my lathes control box, and it works well and I intend to put one in my milling machines box, but its next upgrade is going to be replacing the 28 volt stepper motor supply with a 48 volt version which will allow it to move considerable faster. Thats already built, I just need to take a ladder up so I can reach the interface box, pull it down and rebuild it. That needs a warmer day so I can setup shop on the shop buildings front deck. Cheers Lisi, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/201503200706.07733.ghesk...@wdtv.com
