reverse-run-master2 acceleration issue

[phillc54]

Here are the steps I follow to reproduce the issue:

1. Clone linuxcnc repo, checkout reverse-run-master2 branch, build lcnc and then run with axis_mm from sim/axis

2. Load this code:
   ;line test
   G21
   G64 P0.005
   M52 P1
   F1000
   G0 X10 Y10
   M3 S1
   G1 X90
   G1 X100 Y20
   M5
   G0 X0 Y0
   M2

3. While running, do setp motion.adaptive-feed -1 until the control point reaches the start point then do setp motion.adaptive-feed 1, motion restarts in the forward direction but acceleration is painfully slow.
   If I only do a partial reverse then acceleration appears normal (until a full reverse is applied).
   If I remove line 9 (G1 X100 Y20) acceleration behaves normally.
   If I use arcs, acceleration also appears normal.

This only happens in the first segment, after the second segment is begun then acceleration returns to normal.

Information about my hardware and software:

• I am using Debian GNU/Linux 9.4 (stretch)
• I am using Linux stretch 4.9.0-6-rt-amd64 use Tcl_SetResult and Tcl_GetStringResult #1 SMP PREEMPT RT Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU/Linux
• I am running a rip version
• I am using this LinuxCNC version, v2.8.0pre1feature-reverse-run-master2~bef8d9d52
• I am using AXIS
• I am using axis_mm sim from the configuration selector

[bhushan00]

i am using 2.8 ~pre version but reverse run function isnt working on that

[phillc54]

feature/reverse-run-master2 has not worked for quite some time as it has fallen behind other updates.
There is an up to date branch here that is working for some folk https://github.com/phillc54/linuxcnc/tree/reverse-run

[robEllenberg]

@phillc54 Do you still see this behavior in master after Andy's merge?

[phillc54]

@robEllenberg 62d4c6e seemed to have fixed it