-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 5/6/2013 4:16 AM, Christophe Grellier wrote: > Hello, First, let me say that I am pretty new to CNC. I use a 3 > axis mill (like this one <http://www.cnc-shop.ch/cnc6040.htm>) for > 2 years now And English is not my native language ( i'm french ) so > I may have misunderstood things. Please feel free to correct me if > I'm wrong. > > My current breakout board died because of a motor short-circuit. I > was running it with ubuntu 12.04, xenomai kernel and > "rtos-integration-preview3" branch. So I decided to go for a more > reliable, better quality hardware, and bought a Mesa 5i25 / 7i76 > and Gecko G203V drives. > > From what I understood, the 5i25 does what you call "hardware > stepgen" and the computer latency numbers are much less critical > than "software stepgen". right ? So I installed a Debian Wheezy > with the rt_preempt kernel ( I was fed up with ubuntu 12.04 / > xenomai that didn't let me install fglrx graphic driver ). > > So my main question is : what version of LinuxCNC can I install ? - > the stable 2.5.2 ? From what I understood, it is RTAI-only. - > master branch ? - rtos-integration-preview3 ? I am looking for > something pretty stable, that can work with the rt_preempt kernel.
Then I would stick with the rtos-integration-preview3 branch you were using previously. Build details for Debian Wheeze with an rt kernel are on the wiki: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Debian_Wheezy_Linux-Rt_Compile_LinuxCNC > Would I gain anything at using a xenomai or rtai kernel that have > better latency numbers ? Yes, but if you've got a Mesa card, you don't gain that much on an x86 platform. Unless you're really pushing your servo rate, rtai and xenomai are IMHO really only necessary on x86 if you're trying to do software stepgen. But make sure you test your board, latency numbers for rt_preempt can vary a *LOT* based on BIOS settings and your particular hardware (since for rt_preempt to work well, the driver code needs to be written to work well under SMP). Now if you were on an ARM, rt_preempt still has horrid worst-case latency (milliseconds, or 1000000+ nS), so you need something like xenomai *and* hardware help. - -- Charles Steinkuehler [email protected] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iEYEARECAAYFAlGHnmwACgkQLywbqEHdNFw2bQCgpPayoWBEYQUfDKKygqSabTD0 YBUAoNfGd3bjamEty8AX2x9henRpJ7/d =itD/ -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
