RTAI works better on some boards with the boot option isolcpus=x set in Grub, where x is the number of processor cores minus the first one. In the case of the d525, which has two cores, it should be isolcpus=1. On a four core CPU this will be isolcpus=1,2,3 (specially with hyper threading active, which doesn't make sense on an isolated two core CPU). http://wiki.linuxcnc.org/cgi-bin/wiki.pl?RealTime http://wiki.linuxcnc.org/cgi-bin/wiki.pl?The_Isolcpus_Boot_Parameter_And_GRUB2
I did it this way: $ sudo gedit /etc/default/grub Add the isolcpus option in the end of the line GRUB_CMDLINE_LINUX_DEFAULT Save and exit $ sudo update-grub This is one of the rare cases of a needed reboot, so reboot. You can run the command $ cat /proc/cmdline afterwards to make sure that it took effect. it should be included in the output. /Sven 2014/1/12 Marius Liebenberg <mar...@mastercut.co.za> > Sven > Can you point us to some information regarding the boot options or could > you give some pointers as to what to do. I would like to look at some > performance improvements as I use the D525 board a lot. > > On 2014-01-11 19:43, Sven Wesley wrote: > > You might remember that I made tests with the Atom boards and they didn't > > work as expected. Back then we came to the conclusion that different > > versions of the board where performing differently. > > > > When the European Integrator's meeting were held one off the German guys > > told me he had a lot of experience with these kind of boards and they > truly > > behave different. But he gave me a quick tip: Use a PS/2 mouse! > > So, I just reinstalled one of them with Xubuntu and the 12.04 > installation > > and decided I should try the mouse trick. I tried both a USB and a PS/2 > > mouse. Hyper threading is disabled, no boot options yet and it went from > 25 > > 000 to 15 000 ns. It was actually holding a pretty stable 9 000 for a > long > > time with xeyes, downloading files, HQ youtube clip and a Vimeo video > > running at the same time. Something made it jump to 15000 and then back > > again. Graphics still lags with this setup even though Xubuntu seems much > > better. > > > > I added isolcpus=1 to the boot options and did the latency test again. > Ran > > it twice (the movies lags like crazy) and got 11400 and 9100 ns. > > > > >From 28 000 ns to 10 000. That's a difference. > > > > I'm going to run Mesa cards with these PC's so the timing isn't that > > critical any longer. It feels pretty nice though that the boards can > behave > > a bit better than before with a very small fix. > > > > /Sven > > > ------------------------------------------------------------------------------ > > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > > Learn Why More Businesses Are Choosing CenturyLink Cloud For > > Critical Workloads, Development Environments & Everything In Between. > > Get a Quote or Start a Free Trial Today. > > > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > -- > > Regards /Groete > > Marius D. Liebenberg > +27 82 698 3251 > +27 12 743 6064 > > > > ------------------------------------------------------------------------------ > CenturyLink Cloud: The Leader in Enterprise Cloud Services. > Learn Why More Businesses Are Choosing CenturyLink Cloud For > Critical Workloads, Development Environments & Everything In Between. > Get a Quote or Start a Free Trial Today. > > http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ CenturyLink Cloud: The Leader in Enterprise Cloud Services. Learn Why More Businesses Are Choosing CenturyLink Cloud For Critical Workloads, Development Environments & Everything In Between. Get a Quote or Start a Free Trial Today. http://pubads.g.doubleclick.net/gampad/clk?id=119420431&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
