At this point I would suggest releasing 2.8 with preempt-rt ISO and if
at a later
date RTAI becomes stable release that ISO.
Just my 2ยข well with inflation maybe my $2
JT
On 6/9/2020 5:25 AM, andy pugh wrote:
I had hoped to release 2.8 at Easter, but hit a roadblock.
My plan was to offer both preempt-rt and RTAI ISOs for fresh installs with
Debian Buster, and packages for both realtime systems for the other
supported OSs too.
Unfortunately, despite a lot of effort on the part of Alec and a lesser
amount by myself we have not managed to make the RTAI system exit cleanly
under all circumstances.
Specifically a script that starts realtime, loads an instance of the abs
component and then exists will cause a kernel lock up after hundreds to
thousands of cycles.
Unfortunately this means that runtests will frequently crash the buildbot,
so is a more serious problem than it might seem.
As far as I know the system is reliable and stable while actually running
LinuxCNC.
There is a similar problem simply loading and unloading the RTAI
kernel modules (No LinuxCNC code involved), but that takes tens of
thousands of cycles (typically) to show so may be an entirely different
issue.
Unfortunately many existing users are likely to have machines that won't
work acceptably with preempt-rt and, whilst 2.8 does run on 32-bit Wheezy +
RTAI I really would like to be offering an upgrade path to a supported OS.
So I don't really know what to do.
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