Am 20.03.2013 um 08:48 schrieb Bj?rn: > I bougt this. > http://www.ebay.com/itm/200542103383?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649 > running the latest version of linuxcnc.
specifically which version? I have a D525MW and get much better results > Hypertreading off in bios, > ISOLCPU is done. > > when runnnig latencytest and 3 x glxgears + some video i can run for 30 > min and get: > servo thread (1.0ms) max interval (ns) 1006129 max jitter 11104 > Base thread (25.0ps) max interval (ns) 42342 max jitter 17463 > > i think i could do with this but if i run overnight the same way i get > servo thread (1.0ms) max interval (ns) 1020138 max jitter 24978 > Base thread (25.0ps) max interval (ns) 83039 max jitter 58160 > > does anyone have any idea of hvat this can be? is there a way to se any > debugging information? usually that points to CPU idle/powersave states; it has turned out that wakeup from idle/powersave states is rather nondeterministic and a likely cause of latency spikes to isolate whether this is the case, try to boot the kernel with the option 'idle=poll' if things improve, idle/powersave states are very likely the cause -m > And another question, is it possible to dedicate one cpu to run gui and > other non realtime funktions? > > Regards Bjorn > I am running 10.04 LTS and LinuxCNC 2.5.2 when you say, boot the kernel with the option 'idle=poll' is this done the same way as isolcpu? Regards Bjorn Kristiansen. yes try both 'idle=poll' and 'nohlt' see section 4 of http://wiki.linuxcnc.org/cgi-bin/wiki.pl?XenomaiKernelPackages this applies to RTAI just alike - Michael now i have tested: boot with isolcpu(big improvement in general latency but still spikes) turn of smi, (improvement in general latency but still spikes) 'idle=poll' and 'nohlt'(little or no effect) acpi = off and api=off (little or no effect) For the moment i have been running the system for 1,5 hour and have - servothread interval 999655 and max jitter 4495 ns - base thread interval 32069 max jitter 7190. witch i am very happy with, but if i run for several hours i still get spikes up to 50000 and above. i suspect Michael are right, the problem is related toidle/powersave states. I have no settings in bios to turn of ACPI my bios is: MWNT10N.86A.0083.2011.0524.1600 is this the same as others are running? and do you have option to turn off ACPI from bios? -- Regards: Bjørn Kristiansen ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
