7i96 Error finishing read.
20 Mar 2022 08:09 #237780
by rodw
7i96 Error finishing read. was created by rodw
Worked on a low latency laptop today. Yeh, I know laptops are poor candidates for lcnc... but
HP Pavillion i5. Latency < 20,000
We were getting error finishing read
I added the coalescing stuff to /etc/network/interfaces per hm2_eth man page.
Still could not solve it.
Has anybody got an idea on how to fix this?
Or is it just a laptop thing?
HP Pavillion i5. Latency < 20,000
We were getting error finishing read
I added the coalescing stuff to /etc/network/interfaces per hm2_eth man page.
Still could not solve it.
Has anybody got an idea on how to fix this?
Or is it just a laptop thing?
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20 Mar 2022 13:34 #237796
by tommylight
Replied by tommylight on topic 7i96 Error finishing read.
Try another 5V power.
Otherwise another laptop !
Use latency test and histogram, add --show for histogram.
Also try 2000000 servo period, with 500 P value for PID.
Otherwise another laptop !
Use latency test and histogram, add --show for histogram.
Also try 2000000 servo period, with 500 P value for PID.
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20 Mar 2022 14:37 - 20 Mar 2022 14:38 #237803
by PCW
Replied by PCW on topic 7i96 Error finishing read.
Typically if you get the "Error finishing read" message you have
either lost contact with the 7I96 (power issues or the like)
or too many packets have timed out.
To check for timed out packets, look at the tmax values:
halcmd show param *.tmax
These are in units of CPU clocks
The default timeout value is 80% of the servo thread period
and the default error tolerance settings allow 10 errors in
a row before giving up and reporting the error, so it's usually
really bad network latency that causes the problem.
either lost contact with the 7I96 (power issues or the like)
or too many packets have timed out.
To check for timed out packets, look at the tmax values:
halcmd show param *.tmax
These are in units of CPU clocks
The default timeout value is 80% of the servo thread period
and the default error tolerance settings allow 10 errors in
a row before giving up and reporting the error, so it's usually
really bad network latency that causes the problem.
Last edit: 20 Mar 2022 14:38 by PCW.
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20 Mar 2022 14:47 #237809
by tommylight
Replied by tommylight on topic 7i96 Error finishing read.
Forgot to mention, last year a i got a batch of "high quality" network cables, 5 meter ones had issues with dropped link to a Mesa 7i92, while 10 and 30 meter ones work perfectly near a plasma source.
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20 Mar 2022 15:01 #237814
by PCW
Replied by PCW on topic 7i96 Error finishing read.
Wonder if they were not paired correctly?
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20 Mar 2022 15:13 - 20 Mar 2022 15:16 #237816
by tommylight
Replied by tommylight on topic 7i96 Error finishing read.
Never bothered to check, at 8 Euro a piece should have been good.
They did work but would drop the link at random, from immediately to half a day.
I just check the ping times for 2 to 5 minutes, if there is a difference in response times i just throw the damn thing. I can not risk using it for anything.
-edit
BTW, the 30 meter one is not made by the same company, it was much cheaper but everything seemed better quality despite the price and it works perfectly as it is attached to my big plasma, and despite having 20 meters of it rolled in the same making a big inductor.
They did work but would drop the link at random, from immediately to half a day.
I just check the ping times for 2 to 5 minutes, if there is a difference in response times i just throw the damn thing. I can not risk using it for anything.
-edit
BTW, the 30 meter one is not made by the same company, it was much cheaper but everything seemed better quality despite the price and it works perfectly as it is attached to my big plasma, and despite having 20 meters of it rolled in the same making a big inductor.
Last edit: 20 Mar 2022 15:16 by tommylight. Reason: more info
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20 Mar 2022 16:55 #237828
by billykid
Replied by billykid on topic 7i96 Error finishing read.
I went crazy with a 7i80 that did not want to start, I had to turn it off and on several times to be detected and then work, this with a nuc i3 with bad latency.
i got an i7 pc with very good latency and i got the error like Rod.
usual linux19 mx system with qtplasmac and no other network connection. I have tried three network cables with no changes. after this I took a 5i23 that I had in a drawer and it works up to 8 khz we hope the plasma does not burn it ... but it is without hf I am confident.
i got an i7 pc with very good latency and i got the error like Rod.
usual linux19 mx system with qtplasmac and no other network connection. I have tried three network cables with no changes. after this I took a 5i23 that I had in a drawer and it works up to 8 khz we hope the plasma does not burn it ... but it is without hf I am confident.
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20 Mar 2022 17:13 #237829
by PCW
Replied by PCW on topic 7i96 Error finishing read.
If you have that much trouble, it's likely a bad or damaged 7I80.
What model was it? (there are some 7I80s that had bad
EEPROMs so would not have valid MAC addresses when cold)
What model was it? (there are some 7I80s that had bad
EEPROMs so would not have valid MAC addresses when cold)
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20 Mar 2022 17:40 - 20 Mar 2022 17:47 #237833
by billykid
Replied by billykid on topic 7i96 Error finishing read.
Thanks Peter, now I use the 5i23, then if the 7i80 works I will need to do something else. I don't lack time it is a 7i80db 16 I had asked for the hd but the seller has seen fit to give me what he had ...
it is a 7i80db 16 I had asked for the hd but the seller has seen fit to give me what he had ... 
Last edit: 20 Mar 2022 17:47 by billykid.
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20 Mar 2022 18:00 #237834
by PCW
Replied by PCW on topic 7i96 Error finishing read.
Yeah that's a early 7I80DB so likely has a Microchip 93C46
which it turns out is faulty at low temperatures (at least it does not
work reliably with the Ethernet chip and low temperatures)
which it turns out is faulty at low temperatures (at least it does not
work reliably with the Ethernet chip and low temperatures)
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