I made a DVD and the latency was amazing, 3 us with abuse
(glxgears, obscuring/revealing windows, etc.)
Then, I installed to the hard drive, and the latency was 10
us with the same level of abuse. That was unexpected, but
still not too bad.
So, then I got the source for master, and went through the
preparations to build from source.
dpkg-checkbuilddeps asks for unmet build dependencies
rtai-modules-4.9.0-5-rt-686-pae
My kernel is : 4.9.0-5-rt-686-pae #1 SMP PREEMPT RT
So, I went ahead and installed all the other dependencies,
and built LinuxCNC without any error (as far as I could
see), but I'm having trouble with my ppmc driver.
(parport+stepper works OK.)
I get this report:
rtapi_shmem_new failed due to shmget(key=0x0000006f):
Invalid argument
MOTION: rtapi_shmem_new failed, returned -22
MOTION: init_comm_buffers() failed
So, the loadrt parameter: key=[EMCMOT]SHMEM_KEY is
apparently not to be used in 2.8
But, now I get a system freeze whenever LinuxCNC starts up
with my ppmc driver.
If it doesn't connect to the device, all is fine, but if it
does initialize and enumerate the
device, the system hangs with varying symptoms.
Anybody have an idea how to debug this?
Thanks,
Jon
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