Jitter = 200000

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07 Jan 2024 15:02 #290102 by menedzher
Jitter = 200000 was created by menedzher
Good afternoon. Please help me. What should I set up to speed up?
Installed 2.9.2 with linuxcnc.org .
Jitter = 200000!!!
DELL E5420 Laptop
8 GB RAM (2 pcs of 4 Gb each), DDR3, 1333 MHz
SSD 120 Gb
Intel HD Graphics 3000
Intel Core i5 2520M 2.5GHz (3.2GHz, in Turbo mode) 2-core
 
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07 Jan 2024 15:19 #290105 by menedzher
Replied by menedzher on topic Jitter = 200000
A person from his experience said:
On this laptop, SMI works with Wi-Fi in this way.
Advises to watch the hal-histogram latency in time.

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07 Jan 2024 15:32 #290108 by PCW
Replied by PCW on topic Jitter = 200000
If you are not using a parallel port, you should disable the base thread in the latency test:

latency-test 1ms
or
latency-histogram --nobase
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07 Jan 2024 17:22 #290117 by menedzher
Replied by menedzher on topic Jitter = 200000
Thank you, I will study how to do it.
It is planned to connect the controller via Ethernet.
I attached a histogram.
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07 Jan 2024 18:54 #290132 by menedzher
Replied by menedzher on topic Jitter = 200000
isolcpus=1, hyperthreading 0

Jitter = 196000

Can't I put this laptop on the lathe? + MESA 7I92
 
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07 Jan 2024 20:11 - 07 Jan 2024 20:11 #290136 by rodw
Replied by rodw on topic Jitter = 200000
Only the right hand side is relevant with a mesa card as PCW says open a terminal and tyoe
latency-histogram --nobase --sbins 1000 
to remove the base thread side.
By and large, the latency looks OK, you can see the isolcpus made a difference.
 
Last edit: 07 Jan 2024 20:11 by rodw.
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08 Jan 2024 14:02 - 08 Jan 2024 14:04 #290214 by menedzher
Replied by menedzher on topic Jitter = 200000
Thank you. + Recommended to fix the "latency-histogram --nobase " (base thread is not needed)
The board manufacturer replied.
For MESA Ethernet cards, the absence of Ethernet communication delays also plays an important role.
Your kernel is fresh, everything should work well on such a core with a Realtek network card. Get the board, check the pin (or parameter, I don't remember now) hm2_7i92.0.read.tmax and hm2_7i92.0.read.time (I wrote both names from memory, an error is possible, look in the hal tree). If the tmax is less than a million after a few hours of testing, then everything is fine.
Last edit: 08 Jan 2024 14:04 by menedzher.

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