On Wednesday 12 December 2012 10:06:41 John Stewart did opine: > Hi Sven; > > I'm not saying you are wrong; and I thank you for posting the results > of your testing.
I will say it. If its a 64 bit install, then it is not the rtai patched kernel, and the results predictably will be poorer. > > And today I did. > > Running 2x2 GB RAM to maximize the I/O. Latency test, one glxgears and > > a Firefox to linuxcnc resulted in 15 849. Turned the graphics > > resolution down to 1024x768 and I was able to keep it a bit lower, > > But only a bit as I passed 14 000 for the same test. I still don't > > believe in you guys saying that a D525MW is able to stay below 10 000 > > in a latency test. Neither of my machines has ever exceeded 8u-s, with only one stick of memory in them, 2Gb IOW. Latencyplot has been running on the lathes machine for about an hour, base-thread peak is 5 u-s, servo-thread peak is 5 u-s. > I don't think you changed the graphics driver just by lowering the > latency. I have not done much Linux stuff in years, but I'm wondering > what X graphics driver you are using? Can you force the graphics driver > into some VGA totally software render mode? > > Also remote into it, and run it as a headless station. I should do this > and see how it performs. Maybe next time I have a few hours around the > house (hah! not in the next few weeks…) I'll run that test. > > > One thing though, I filled one of the boards with 8 GB RAM (2x4). That > > board is running 64 bit Ubuntu in the office and it happily reported 8 > > GB even though the hardware spec says max 4 GB. It seems that 4 GB is > > a soft limit. > > Running a 32 bit kernel? I don't think you'll be able to address over 4g > via sw. Maybe they expect people to run windows, not Linux! > > Interesting that you can put the RAM in, as like you, I had assumed that > it was not just a SW limit. > > Thanks; > > John A. Stewart. A 64 bit linux that has a problem with even 64Gb of ram should have a bug report filed. 32 bit however has to jump through some time consuming hoops. > ------------------------------------------------------------------------ > ------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free > Trial Remotely access PCs and mobile devices and provide instant > support Improve your efficiency, and focus on delivering more value-add > services Discover what IT Professionals Know. Rescue delivers > http://p.sf.net/sfu/logmein_12329d2d > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! If society fits you comfortably enough, you call it freedom. -- Robert Frost I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
