Thanks Sven, easy enough. On 2014-01-12 10:34, Sven Wesley wrote: > 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 >
-- 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
