Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Mon, 02 Dec 2002 11:12:49 -0600

Marty Kraimer wrote:

Booting tornado II gives

tExcTask   _excTask   fe80f4   0 PEND      6cd04   fe8054      0     0
tLogTask   _logTask   fe57cc   0 PEND      6cd04   fe5728      0     0
tShell     _shell     ed9540   1 READY     2cfc4   ed91e8 1c0001     0
tTelnetd   _telnetd   edfb38   2 PEND      253ea   edfa48      0     0
tNetTask   _netTask   f57408  50 PEND      253ea   f573b0      0     0
tPortmapd  _portmapd  ede5f8 100 PEND      253ea   ede4b0     16     0

Thus to ensure really good real time performance the priority of all of

the above should be changed.

Never change the priority of tExcTask, it is used by the OS to do things

that can't be run in an ISR but have been requested by one (for example

outputting the message in response to a Bus Error). I would also advise

not changing the shell priority here at APS at least - it has got us out

of many sticky situations in the past because it's higher than everything

else.

I don't think we should consider changing any existing task priorities on

vxWorks, although we could adjust the way that the OSI thread priorities

map to vxWorks ones if we wanted to reduce jitter by putting the scan

tasks higher than tNetTask. I'd want someone to do a thorough test first

though, and we don't have time for that before R3.14.1. If anyone does

want to reduce the priority of tShell it's very easy to do in a vxWorks

startup script.

- Andrew
--
"Life is what happens while you're busy making other plans." - John Lennon

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System