error: version.h not found - Is the kernel headers

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22 Mar 2014 01:03 - 22 Mar 2014 01:04 #45044 by ArcEye

the installation was succesful, see the screenshot:


Well done

What do you think about? This does not look good, right?


I have no idea what your computer is.
A lot of people would be happy with 17K.

The kernel config you used is for a SMP kernel with 4 cores.
You will need to target your precise processor type to get it lower.

You probably also need to look at isolcpus=0,1,2 (for a quad core) on the kernel boot line in GRUB
to shift everything onto 1 core

I have built a UP version of this kernel for my P4s in the workshop, which runs at 5K - 9K latency
That requires some particular changes to the config regards LAPIC to enable realtime to work.

regards
Last edit: 22 Mar 2014 01:04 by ArcEye.
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23 Mar 2014 02:38 #45107 by andypugh

Please look at the result of my latency test.
What do you think about? This does not look good, right?


17k is perfectly OK. You will be able to make more steps per second at 30,000 ns Base thread than your steppers can handle. (1300 rpm even at x8 microstepping)
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23 Mar 2014 04:44 #45115 by taffou
Hi

I have no idea what your computer is.

Mainboard: ASUS P5G41T-M LX, Processor: Intel Dual-Core E3500, 2x2700MHz and RAM: 2048 MB

The kernel config you used is for a SMP kernel with 4 cores.
You will need to target your precise processor type to get it lower.

I had already made this change

You probably also need to look at isolcpus=0,1,2 (for a quad core) on the kernel boot line in GRUB
to shift everything onto 1 core


I isolate the cpu 1 with this command: "isolcpus=1" and I have performed the latency test again. This is the result.

File Attachment:

File Name: latency_te...us_1.txt
File Size:4 KB


Please can you explain me how do you calculate the 17k from the first test data?

Regards,
Taffou
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23 Mar 2014 05:35 #45118 by andypugh

I isolate the cpu 1 with this command: "isolcpus=1" and I have performed the latency test again. This is the result.


That looks excellent, but you need to run it rather longer.

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23 Mar 2014 05:48 #45120 by taffou

That looks excellent, but you need to run it rather longer.



File Attachment:

File Name: latency_te...nger.txt
File Size:37 KB


Taffou
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23 Mar 2014 06:31 #45122 by andypugh
That's 13k Latency. (odd that it gets there absolutely immediately)

13k is good.

There is a GUI-based latency test on the CNC menu, and you might want to leave that running for a day while you use the machine hard (web, music, CAD) and see just how high you can force it.
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23 Mar 2014 14:30 #45134 by ArcEye

Please can you explain me how do you calculate the 17k from the first test data?


The column <ovl max> is base thread max jitter

As Andy says you need to do the graphical latency-test with glxgears running , window moves etc.
You have not taxed the graphics system using a text based test in a terminal, you may find you get a quite higher figure

regards
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