Results of latency test, list of computers tested for use with LinuxCNC

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15 Nov 2022 21:05 #256800 by tommylight
While you are at it, can you please add a way to find out the IP address and gateway address and ping the gateway say 50 or 100 times and report the times?
That would be helpful to point out some PC's having issues with new kernels and network cards causing loss of connection to controler boards.
So far Intel network cards are OK, some just need setting IRQ coalesing to 0, some work out of the box.
Realtek cards have something wrong in the kernel, and despite having good ping times tend to drop the link consistently.
Not sure how usefull will that be due to above reasons, but maybe there is a pattern somewhere.

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15 Nov 2022 22:04 #256803 by seuchato
At your service! I am currently looking into disc load. I will add this to the todo list. Is this important? If, I'll give it priority, say 3 :-). Rest will be in script development thread - soon.
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15 Nov 2022 22:23 #256809 by D.L.
seuchato, I think new version of LinuxCNC(2.8.x) shows worse latency results, no matter what type of disk is used.
In the near future i will test LinuxCNC version 2.7.14 with SSD and with 5 glxgears, this will show the real effect on disk type changes.

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16 Nov 2022 13:39 #256859 by D.L.
MB  GA-J1800N-D2H(BIOS F6)
RAM KVR13S9S8/4 4Gb
SSD SA400S37/240G
Debian Wheezy 3.2.0-6-rt-686-pae
LinuxCNC v. 2.7.14

kernel parameters: "isolcpus=0 lapic quiet"
 

kernel parameters: "isolcpus=1 lapic quiet"
 

With SSD the result is the same as 4 years ago.
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16 Nov 2022 16:01 #256867 by tommylight
Add
--show
At the end of latency-histogram command, there are spikes outside of visible area on both screenshots.
Those two colored columns at both sides of the plot in red and green or red and blue, those are spikes.
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