Hi Peter, I think you meant to say 20% not 120% since you gave the example of 200ms jitter will trip the error with a 1ms servo thread. I had a chance to do some further testing. I ran the latency test for longer - a couple hours and the servo thread jitter just barely exceeded 14us which is exactly 2% of my servo thread (700us) so I'm thinking the error is tripping at only 2% jitter - remember I have no base thread. I tried turning off hyper-threading and adding the isolcpus=1 to grub and the latency numbers about halved and no more delay errors - BUT - It has severely affected the computers performance so I won't leave it that way. I would rather just clear the error. I think 2% jitter on the servo thread is perfectly acceptable. My motors are running smooth as silk and performing well. So if it's supposed to trip at 20% and mine seems to trip at 2% have I discovered a bug or is this a problem exclusive to my system? Maybe someone else running a servo only system could try setting their servo period to 40x max jitter and see if the error is generated. That would make the error 2.5% - enough to trip if it is in fact tripping at 2%. Anyway, no biggie. I don't mind clearing the error since it only pops up once per run. It would be different if it was nagging me.
Joel Jacobs On Tue, Mar 15, 2011 at 3:29 PM, Peter C. Wallace <p...@mesanet.com> wrote: > On Tue, 15 Mar 2011, Joel Jacobs wrote: >> Hi, >> Is there any way to adjust the sensitivity or suppress this error? I >> have an Atom D525 running the latest EMC2 > > > You will still get "unexpected realtime delay" errors with just a servo thread > if the latency gets to be more than 120% of the servo period (this would be > 200 uSec at a 1ms servo thread period) This is a fairly serious amount of > latency and probably should be looked into. ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
