On 06/28/2017 03:50 AM, Les Newell wrote:
OK, Tried the usual reseating components etc and that PC
does not want to play. I found a Dell SFF PC in the junk
pile. After hacking it to take a full size PCI card I
fired it up. Running my old Debian + LinuxCNC 2.6.0 it
runs smooth. Latency jitter is 7us,10us. Running the
latest LinuxCNC image installed on an SSD it runs rough,
latency jitter is 37us,16us. 2.6.0 won't build on the
latest image but I built 2.6.13 and it also runs rough,
though maybe not quite as rough as 2.7.9.
Is there any way to install an older RTAI version?
I'm pretty sure some of the older ISO files are available,
but may not be listed directly on linuxcnc.org
Check with uname -a to see what kernel you are using, it
might be a preempt kernel, which will have worse latency
than rtai. But, 37 us shouldn't cause serious problems, so
I'm thinking it probably is not the kernel, but something to
do with the PID.
Jon
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