On Fri, 22 Jun 2018, John Dammeyer wrote:
Date: Fri, 22 Jun 2018 08:39:55 -0700
From: John Dammeyer <jo...@autoartisans.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "'Enhanced Machine Controller (EMC)'" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Raspberry Pi PREEMPT-RT
I believe the BeagleBone Black MachineKit uses one of the RT kernel
modifications. However, it's the two PRU processors inside the Beagle that
make it possible to run stepping motors and decode encoders.
It actually boggles my mind that decades after say OS-968K, VRTX-86 RTOS or
for that matter the RTOS I wrote in University that something like Linux
doesn??t have a RT Kernal and that if you didn??t want RT capability that
then
you'd have flavours off the main line for that.
Perhaps so much of the internal Linux code would be broken with badly written
code that has priority inversions etc. and would therefore be broken that it
continues down the path of non-real time.
Simply mind boggling.
John
Linux has had real time kernels for more than 10 years
Currently Preempt-RT patches track mainline Linux kernels and are no more than
a version or so behind mainline
There are good reasons for using not real time kernels unless real time is
required (many real time kernel patches trade off throughput for better
latency)
Peter Wallace
Mesa Electronics
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