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[00:15:02] <PCW> A Cheap (read) FIFO trick to allow retries would be to allow read and write of the read data pointer (or local push/pop)
[00:15:04] <PCW> then if a read packet went astray the host could restore the read pointer and try again
[00:24:31] <PCW> or you could turn that around and not advance the read base pointer at all, when reading the FIFO just the temporary index
[00:24:33] <PCW> and then only "commit" the read in the following write cycle if the read data got there safely
[00:25:28] * PCW is likely talking to himself (again )
[00:30:32] <Tom_itx> still good to get it out :)
[00:32:22] <PCW> :-)
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[11:56:35] <jthornton> skunksleep,
https://www.youtube.com/watch?v=isTD6bDF_LI
[11:56:40] <jthornton> here is another video
[12:10:31] <malcom2073> I know it's plastic, but seriously? Fingers?
[12:10:32] <malcom2073> :P
[12:10:52] <malcom2073> Nice tool post
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[12:40:42] <archivist> good ol stringy plastic
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[13:56:39] <mozmck> skunkworks: the threading saga on the mach list goes on...
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[14:00:47] <mozmck> https://youtu.be/NPwnOZ2gNJ0
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[15:08:15] <seb_kuzminsky> that looks, great, mozmck
[15:10:28] <jepler> at this point I think the only video needed in the threading thread is a rickroll
[15:31:43] <pcw_home> Did you see my suggestion for repeating FIFO reads? ( probably a very old idea )
[15:35:36] <pcw_home> I think I like the push/pop read pointer best since if you dont use the feature it behaves like a standard FIFO
[15:35:38] <pcw_home> and you dont need to worry about pointer sizes/masks etc
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[15:45:05] <pcw_home> whether this is really worth bothering with, I don't Know
[15:45:07] <pcw_home> I can see a use case for high speed streaming output ( laser modulation )
[15:45:08] <pcw_home> streaming input, not sure where you would use that
[15:45:59] <jepler> pcw_home: yes I did, thanks
[15:47:04] <jepler> pcw_home: I agree, I don't think it would be burning too many bridges to start with only output FIFOs supported
[15:48:39] <jepler> but probably figuring out the details of recovering from lost packets in general should be done first
[15:48:56] <pcw_home> Yes
[15:49:32] <jepler> it's easy to simulate lost packets with iptables so that'll be nice
http://code.nomad-labs.com/2010/03/11/simulating-dropped-packets-aka-crappy-internets-with-iptables/
[15:51:12] <pcw_home> Yeah thats needed for testing
[15:51:49] <jepler> pid and motion will both need "no position feedback update was available" inputs, and internal logic added to mask following errors / avoid winding up I-terms. and motion would need to treat too many consecutive missed feedbacks as a fault.
[15:52:49] <pcw_home> I dont think Ive ever seen a dropped packet in my testing but it a benign electrical environment
[15:52:57] <jepler> same here
[15:53:54] <pcw_home> Yeah for PID a freeze input (and internal support) is probably all thats needed
[15:55:06] <jepler> and the 120ms(?) max wait time for a read packet has to be greatly reduced
[15:55:31] <jepler> one problem with that was that the thread period is not known way down in the hm2_eth read response function
[15:56:14] <jepler> and FIFO-type components within hostmot2 will need to recover from a lost write packet
[15:56:15] <pcw_home> thats an issue because it probably needs to be set to some reasonable fraction of the servo thread period
[15:57:23] <jepler> doing it as a fraction of servo period is one possibility
[15:57:32] <jepler> doing it by adding up the transmission and processing times is another
[15:57:36] <pcw_home> On sserial we measure the remote response time , and pad it for timeouts
[15:58:57] <jepler> if your period is 1ms or 10ms, but the turnaround time is 100us either way, then using 20% of 10ms is silly
[15:59:59] <pcw_home> but its not terribly harmful either
[16:00:02] <jepler> yes
[16:01:29] <pcw_home> a reasonable timeout is worst case latency (of all servo thread functions) related
[16:02:32] <jepler> in other words, you have to make the timeout low enough that actually hitting it doesn't make you miss a realtime delay
[16:03:44] <pcw_home> yes and long enough that you dont get false timeouts from host latency
[16:05:38] <pcw_home> in which case you would get the late packet on the next thread
[16:11:43] <pcw_home> on this system ( DC7800/E8500 ) there are rare 120 or so usec added delays in hm2_read
[16:11:44] <pcw_home> rare being say one or twice a week. This also happens in motion-command-handler
[16:11:46] <pcw_home> but much more rarely, so it is rather difficult to know the total thread time
[16:11:47] <pcw_home> which is why a percentage of the thread period seems like a simple starting point
[16:12:41] <pcw_home> (My H97 system does not have this behavior)
[16:34:03] <jepler> OK, so add dealing with a packet that arrived but late to the list of things to handle
[16:34:47] <pcw_home> slowly inventing TCPIP
[16:37:27] <pcw_home> I wonder what other systems do? (LIke Ethernet Powerlink)
[16:37:28] <pcw_home> or do they just say fix your noise issues
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[19:30:07] <skunksleep> jthornton: thanks!
[19:33:18] <skunksleep> mozmck: I am trying hard not to reply.. Steve is in fine form.
[19:38:36] <skunksleep> https://groups.yahoo.com/neo/groups/mach1mach2cnc/conversations/messages/148845
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[19:54:11] <skunksleep> mozmck: very cool. That thing flies too.
[20:08:26] <skunksleep> http://www.linuxcnc.org/index.php/english/forum/20-g-code/29685-g76-pause-in-z-during-exit-taper-linux-cnc-270
[20:08:48] <skunksleep> Can someone test this on sim?
[20:09:01] <skunksleep> I cannot right now
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[20:32:38] <Tom_itx> skunksleep, did you get the latest sherline rigid tapping vid?
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[20:35:16] <skunksleep> I think I posted it
[20:35:36] <skunksleep> Or was there another one?
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[20:37:42] <skunksleep> Yes I think I got your new one
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[20:51:18] <jepler> skunksleep: I tested that on sim/axis/lathe.ini and I don't see a dip in zvel during the thread cutting. Tested with 2.7 branch, describes as v2.7.0-29-g0037cae halscope
http://emergent.unpythonic.net/files/sandbox/master-sim-lathe-thread-taper.png
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[20:53:49] <jepler> I did a second plot with xpos so it was clearer where in the plot the taper was. it's all within the portion where Zvel is constant
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[20:58:11] <jepler> http://emergent.unpythonic.net/files/sandbox/master-sim-lathe-thread-taper2.png
[20:59:19] <andypugh> I have never quite figured out the little wiggle that X does.
[20:59:41] <skunksleep> That looks perfect
[21:00:16] <jepler> I don't know what the waggle at the start is either!
[21:00:43] <skunksleep> jepler: thank you
[21:01:04] <jepler> skunksleep: welcome
[21:01:22] <andypugh> It always does it. I think it is to make the entry moves always the same. But as the entry waits for index, so is exact-stop (assumption) I don’t think it is neceesary.
[21:02:14] <jepler> oh is it something the g76 cycle is doing?
[21:03:35] <andypugh> Interesting thing today. I made a new config for milling in the horizontal spindle. That means a simple swap of Y and Z. But as the new Y (old Z) runs in the opposite direction it turns out that I had to change the sign of the D-gain
[21:03:52] <andypugh> jepler: Yes, the wiggle is a G76 thing.
[21:04:46] <andypugh> (and, thinking about it, I needed to flip X, not Z really. I have a right-handed coordinate sytem but Y positive _towards_ the table is just confusing.
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[21:08:18] <skunksleep> What are you going to machine?
[21:08:35] <andypugh> skunksleep: A foundry pattern.
[21:08:49] <andypugh> It’s to big to do any other way.
[21:09:16] <andypugh> But a horizontal spindle is pretty good at machining the sides of a bix.
[21:09:23] <andypugh> (box)
[21:09:42] <andypugh> Well, I anticipate it being good at it.
[21:10:09] <andypugh> I guess tomorrow I get to clean and dry the machine ready for covering it in MDF chips. :-/
[21:16:06] <skunksleep> Yeck
[21:16:57] <andypugh> Maybe I will keep a vacuum cleaner on it, if I can stand the noise.
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[22:33:50] <Tom_itx> zlog_
[22:33:51] <zlog_> Tom_itx: Log stored at
http://tom-itx.no-ip.biz:81/~tom-itx/irc/logs/%23linuxcnc-devel/2015-09-26.html
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