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Servo thread rate too fast

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11 Nov 2022 12:30 #256423 by CNC_ANDI
Servo thread rate too fast was created by CNC_ANDI
Hallo, ich bekomme immer wieder beim öffnen von Probe_basic die Meldung


mein latency test sieht so aus


woran liegt das kann ich irgendwas dagegen tun?
ich hab mal verschiedene dateien noch angehangen. 
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11 Nov 2022 12:42 #256425 by tommylight
Replied by tommylight on topic Servo thread rate too fast
Beim BIOS,
-disable hyperthreading
-disable C states
-disable everything with power saving
-disable turbo
-disable speed step
etc.

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11 Nov 2022 13:13 #256428 by CNC_ANDI
Replied by CNC_ANDI on topic Servo thread rate too fast
Hello thanks,

but always was disabled in Bios, now changes

i´ve tried isolcpus=1,2,3 too, makes al litte bit of change

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11 Nov 2022 13:41 #256430 by PCW
Replied by PCW on topic Servo thread rate too fast
Also if your host PC has an Intel Ethernet chip, you must disable IRQ coalescing
(man hm2_eth)

What host hardware do you have and which OS?

(uname -a)

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11 Nov 2022 13:42 - 11 Nov 2022 13:52 #256431 by CNC_ANDI
Replied by CNC_ANDI on topic Servo thread rate too fast
hello, the uname -a file is in my first post

i dont know what you mean with (man hm2_eth)

how can i disable IRQ coalescing?

it´s a intel i5 quadcore with 16gb of ram and ssd harddrive
Last edit: 11 Nov 2022 13:52 by CNC_ANDI.

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11 Nov 2022 13:53 #256435 by PCW
Replied by PCW on topic Servo thread rate too fast
OK so you have a Intel MAC which needs to have IRQ coalescing disabled

temporarily, you can try

sudo ethtool -C [ethernet_device_name] rx-usecs 0

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11 Nov 2022 14:45 #256438 by andypugh
Replied by andypugh on topic Servo thread rate too fast

i dont know what you mean with (man hm2_eth)

He means "type 'man hm2_eth'" at the command line to view the hm2_eth manual pages. 

Alternatively, follow this link: linuxcnc.org/docs/stable/html/man/man9/hm2_eth.9.html

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11 Nov 2022 15:07 #256440 by CNC_ANDI
Replied by CNC_ANDI on topic Servo thread rate too fast
ok thanks i have test it and the latency is much better

max 12000 jitter

i will test it few times

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