Experimental Physics and
Industrial Control System

"Andreas Isenegger" <[email protected]> · Mon, 11 Jul 2005 13:55:23 +0200

Hello All,
When running EPICS 3.13.9/10 on VxWorks 5.5 on a MV230x IOC, the IOC doesn't
recover from a broken network link (e.g. disconnect N/W cable for 5...30
seconds).
With VxWorks 5.3.1, this works. I am aware that this could be a bug in
VxWorks, but it could also be an API programming problem between the lowest
EPICS N/W layer and the highest VxWorks N/W layer.
Has anyone encountered the same problem and/or knows accidentally the
solution for it?
My investigation showed that

- If EPICS isn't loaded, the network connection will be restored

- If EPICS is loaded, but only little CA traffic is generated, the N/W
connection will more likely be recovered by VxWorks than with high traffic

- By clearing the flag DEC_TX_KICKSTART in the file dec21x40End.c, I could
improve the behavior, but by no means fix it

- Playing with the taskDelay() in dec21x40Start() does change the behavior,
but not fix it

- The debug printouts of VxWorks show that the network driver doesn't return
free Transmit Descriptors anymore; however, I have no clue why...
Any comments welcome.
Regards,
Andreas
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Andreas Isenegger
SLS Controls
Paul Scherrer Institute, WSLA/207
CH-5232 Villigen PSI, Switzerland
Tel/Fax: ++41 (56) 310 5125/4413
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System