I'm no expert on this. Those of you who are more experienced with this, please correct me if I am wrong.
But I recently had a system with similar latency numbers to yours, and was able to run a cpu hog while doing the test, and reduced the latency to around 4000. The cpu hog is a simple routine you run in the terminal. From what I understand it keeps the cpu active so it won't do any power saving which adversely affects the latency. You run it by opening Terminal then copy/paste this command into the command line (then press enter): while true ; do echo "nothing" > /dev/null ; done That will start the cpu hog running, then run the latency test. You should see your numbers come down. What I don't know (and hopefully someone will chime in and let us know) is this: Do you have to run the cpu hog while you're operating linuxcnc to see the benefits of that lower latency while operating the actual machine? You can read more about the cpu hog on this page: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RealTime On Thu, Sep 15, 2016 at 11:16 AM, Chris Albertson <albertson.ch...@gmail.com > wrote: > Hello, > > Got a "new" computer I saved from going to the dump. II am going to it use > for LinuxCNC. I tested latency for a good 30 minutes and got just under > 30,000 over 20,000 on the display. The PC is an Intel i7, 2.67 GHz, 4GB > RAM and no built-in graphics on the mother board. There is a video card in > one of the slots. One PCI slot is free. > > I want to run some NEMA 23 stepper motors to control a Sieg X2 mill. (aka > "Mini Mill".) Yes, call it a "toy" but the parts I want to make would fit > on your open hand. I have a rotary table I am converting also and hope one > day to be able to do 4-axis work. > > Questions: > > 1) Is it worth it to experiment with different video drivers and such to > reduce the latency? The numbers look good enough already, I think. > > 2) What would I gain by using a Mesa card over a parallel port card? I > don't have either one of these now and would need to buy one or the other > and with only one PCI slot I can use only one card. > > > -- > > Chris Albertson > Redondo Beach, California > ------------------------------------------------------------ > ------------------ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
