latency-test 1ms from my 17:45 (forum hour) to now (surfing, 3 youtube windows): servo thread 1ms Max Jitter 38404 .... and no go up if run some other program ....
After 16 hour of youtube html5 and flash player videos, running bash script for open and close a program .... latency-test 1ms = 44932 ....
Tonight I've a doubt .... than today i've create a config with stepconf and parallel port ..... I make a bash for launch and close it (100 time) ... never see the realtime error ..... than try to launch mymachineconf (with mesa 5i25 + 7i77) at 2° time have the error 5/6 sec after the launch .....
It means that the 1 MS thread has experienced >200 usec delays occasionally
It may be that you dont have real time errors in the parallel port case because the base
thread keeps the cache filled with RT code.
On poor RT hardware (and I consider all Atoms up to Baytrail quite poor)
You might try ArcEyes trick of running a dummy base thread
I might note that I do not see any RT errors on my D510 running a 1 KHz thread
(and its run Mesa hardware continuously for years at a time)
It might be related to the Power VR graphics in the CedarView (D2xxx) series Atoms
@PCW --- your suggestion at last is buy a motherboard with cpu with more cache and greater frequecy .... Is right? You can suggest an quite good cpu and motherboard? (consider my choice for now is ubuntu 10.04 .... with debian before we have to play a little longer and completely skip wheezy )
if that's what you suggest seems the lesser evil. I'll wait for your confirmation.
@ arkEye or @PCW is possible that the problem (rtai error on start up only with mesa5i25) is become from buffered RAM. My ram isn't buffered but in asrock j1900-itx not work (crucial ddr3 ram as ad2550b motherboard) ... I've read some post where someone suggest not use crucial ddr3 because it has some kind of buffer anyhow ....
