Intel NUC i3 latency issues with mesa 7i76 card

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07 Jan 2022 21:39 #231062 by cheburs
Hello,
Using Intel NUC to run mesa 7i76 card. 
Model BOXNUC8I3BEK2 (i3 with ssd hdd and 6gb ram.)

Im having trouble with servo period and mesa card 7i76. It shows error when its at default value of 100 0000.
Need to adjust over 170 0000 to error go away.

Is this something i need to worry?

Some tricks to make it less?

have isolated cpu to 1.

Thanks!
 
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07 Jan 2022 21:57 #231063 by PCW
1. Have you disabled all power management in the BIOs? (including
speed-step. Turbo modes, C states > C1 etc etc)
2. Assuming the NUC has an Intel Ethernet chip, have you disabled
irq coalescing on the Ethernet port?
(this is described in the hm2_eth driver man page)

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08 Jan 2022 21:03 - 08 Jan 2022 21:04 #231175 by cheburs
Did some more tests today.
In bios i already had disabled many things. Audio, Bluetooth, turbo etc.
With coalescing disabled ping was x2 better, but eventually it didn't resolve servo thread problem.I couldn't go lover than 1600000.
Sometimes opening and closing multiple times linuxcnc error didn't show but but thats not reliable.
How to properly edit this so i dont need to run command from terminal?



Ping before and after coalescing

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Last edit: 08 Jan 2022 21:04 by cheburs.

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08 Jan 2022 21:34 #231178 by PCW
You need to specify the interface for the driver setting

for example

auto eno1
iface eno1 inet static
address 10.10.10.100
hardware-irq-coalesce-rx-usecs 0

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