Optiplex 755

zz912
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07 Mar 2023 19:07 #266055 by zz912

Replied by zz912 on topic Optiplex 755

jarda@CNC1:~$ sudo chrt 99 ping -i .001 -q 10.10.10.10
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
^C
--- 10.10.10.10 ping statistics ---
253024 packets transmitted, 253023 received, 0.000395219% packet loss, time 276ms
rtt min/avg/max/mdev = 0.164/0.253/0.539/0.012 ms
jarda@CNC1:~$

I have to go home right now. I can do more tests tomorrow.

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zz912
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08 Mar 2023 05:25 #266093 by zz912

Replied by zz912 on topic Optiplex 755

Optiplex 7010
I made same test with Optiplex 7010 at home.

Coalescing Disabled
It is better, but first test is wrong too.

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zz912
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09 Mar 2023 09:38 #266185 by zz912

Replied by zz912 on topic Optiplex 755

I would like to ask what these tests mean? Do I have a weak PC? Or is there a bug somewhere (LCNC, kernel, debian ....)?

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09 Mar 2023 11:27 #266200 by rodw

Replied by rodw on topic Optiplex 755

try this command

latency-histogram --nobase --sbins 1000

as PCW said there is no need to look at the base thread as it is not used with a mesa card.

the histogram shows the jitter which is the time a thread is late or early. If there is too much jitter, the servo-thread will not get finished before the next one starts... which is a latency error...

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zz912
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09 Mar 2023 12:44 - 09 Mar 2023 13:42 #266205 by zz912

Replied by zz912 on topic Optiplex 755

1) I understand, that I can ignore Base thread. I didn't realize that 25000 in the error message means that the error is in basethread and not in servothead.

2) My main question is, can I ignore the PC test in the MesaCT configurator?

3) I will try latency-histogram

Last edit: 09 Mar 2023 13:42 by zz912.

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PCW
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09 Mar 2023 15:01 #266214 by PCW

Replied by PCW on topic Optiplex 755

I think there is a bug in mesact

The servo thread tmax should show 75%

(100*1747291/2333333)

If you have disabled all power saving options in the CPU
and have Interrupt coalescing off you may have to run at a lower
servo thread rate on that PC (say 2 ms period instead of 1 ms)

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zz912
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09 Mar 2023 15:33 #266217 by zz912

Replied by zz912 on topic Optiplex 755

I had 3 problems:
1) MesaCT - I'm going to assume it's wrong.
2) Latency message error - now I know, that it is BaseThread
3) SSerial error - Maybe turning off the AMT setup will help. I will keep an eye out to see if the error reappears.

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zz912
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10 Mar 2023 16:05 #266298 by zz912

Replied by zz912 on topic Optiplex 755

Yesterday I celebrated that turning off AMT solved my problem. Today I came to the PC and again it is causing problems.

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PCW
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10 Mar 2023 16:22 #266300 by PCW

Replied by PCW on topic Optiplex 755

I would try a 2 ms servo thread period

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zz912
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10 Mar 2023 17:23 #266307 by zz912

Replied by zz912 on topic Optiplex 755

2 ms did not help:

Mabey evengravy have solution:
forum.linuxcnc.org/38-general-linuxcnc-q...2-8-4-stretch#266292

It's strange that I had no problems yesterday.

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Optiplex 755

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