I use a D945GSEJT (single core atom 1.6GHz) in that kind of configuration - I've disabled X11, so I always boot to a command prompt. I have a KVM if I need it. Jitter - 6873/6755. When running a desktop it glitches to about 15000.
I still haven't removed all unnecessary daemons. My plan is to have emc completely controlled by my pendant so it will be headless. > -----Original Message----- > From: Kent A. Reed [mailto:knbr...@erols.com] > Sent: Monday, 9 January 2012 10:28 AM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] running headless on my ASUS AT5NM10-I MB (Intel > Atom D510 cpu) > > Gentle persons: > > Recently, I wrote... > > > I just ran 15-minute latency tests on my ASUS AT5NM10-I board (which is > equipped with an Intel Atom D510 cpu) first with a stock boot and then with > isolcpus=1 as a boot parameter. I've posted my results in the table on the > Wiki. > > > > In brief, isolating one cpu shaved approximately 6000ns off the max jitters > reported for both the base thread and the servo thread. > > > > Of course the latency test should be run much longer but I believe > > these numbers are indicative. YMMV > > I had a few minutes this afternoon and decided to try another experiment > with this board---still running Ubuntu 10.04LTS with the 2.6.32-122-rtai > kernel. > > I disabled Gnome (which shut down X) on the board by running the following > from the command line: > > sudo service gdm stop > > (I disabled a few other services too, like Apache, but I don't think this is > relevant. The stock Ubuntu/EMC2 install starts up far too many services for > my taste. When I want a controller, that's all I want, not a desktop > computer.) > > Then I logged out and disconnected keyboard/mouse/monitor (well, actually > I just set my KVM switch to another computer; possibly it still imposes some > electrical levels at the motherboard connectors.) > > Finally, I logged into the board via Ethernet from another computer using ssh > -Y and again ran the latency-test for 15 minutes with approximately the same > level of stress as before (2 copies of glxgear, web browsing, listing the > directories of an external USB drive, etc.). > > Bottom line: the latency numbers got even better. Max jitter fell to > 3211ns/3222ns. > > For some time I have envisioned running my tabletop mill with a headless > controller and a networked operator console. If anything, the present result > says this would be the preferred mode. Of course, I could make it cleaner by > stripping down the distribution some more, possible even install RTAI and > EMC2 over a Ubuntu server distribution to avoid the Gnome/X-server stuff > altogether, since there's the usual niff-naff about booting Ubuntu desktop > edition without a monitor attached, etc. > > I'm curious if anyone has tried this experiment with other boards and, if so, > what results were obtained. > > And, yes, I realize I am chasing after diminishing returns. The latency on a > stock board is already good enough for practical purposes. Let's just say my > home situation causes a form of ADHD were I work furiously on very short- > term projects. > > Regards, > Kent > > > > > ---------------------------------------------------------------------------- -- > Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex > infrastructure or vast IT resources to deliver seamless, secure access to > virtual desktops. With this all-in-one solution, easily deploy virtual desktops > for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it > free! http://p.sf.net/sfu/Citrix-VDIinabox > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
