Hardware latency tests, used PC's

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23 Sep 2020 13:20 #183467 by tommylight
You are welcomed, always.

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12 Dec 2020 23:03 #191790 by tommylight
This is not a used PC, it is new, but might be useful for someone thinking of getting something similar,
New PC:
-MB Gigabyte Aorus Elite X570
-AMD Ryzen 5 3500X
-16GB (4X4GB)
-256GB NVME
-AMD RX480
-Noctua NH-D15
-Mesa 6i25
-Mint 20
-4.9.0-13-rt
And the result while doing things on the PC, doing a lot of things as can be seen on the bottom left side of the screen:


Had to scale down the image, to large to upload.
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28 Apr 2021 20:43 #207331 by countersunkentreasure

forum.linuxcnc.org/18-computer/38838-har...-pc-s?start=0#163885
That was with 2GB of RAM, adding another 2GB made it much better and usable.
For software stepping it needs an older RTAI kernel to work, new ones do not work on them, it has a nice latency so parallel port can be used.
For Mesa boards it will need at least 4GB of RAM to have usable latency with new Preempt-RT kernels, use the 4.9 as it has the best latency on it.

Thanks for this senior tommylight. I'm going to take whack at setting up an Odroid and keep the Optiplex as a test (after adding to more GB RAM).
T-



Did either of you end up rerunning the Optiplex 780 with the extra memory? What kind of results did you end up with? I've got one with the E7500 2.93Ghz and 8GB. Just got it setup triple booting W7 x86; LinuxCNC 2.8.0 Debian 7 Wheezy RTAI; and LinuxCNC 2.8.0 Debian 10 Buster PREEMPT-RT ISO . Planning to run via parallel. I just ran across your testing script and I'll try to figure it out. Wanted something to compare it to if you had it. Thanks!

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28 Apr 2021 21:12 #207333 by tommylight
Nope, can not find them anymore.
Got a Dell 7010 and a Fujitsu today, Dell is surprisingly good while Fujitsu is surprisingly bad ! :) :(
No internet in the new shop (metal cladding does not help WiFi) so if at all possible i will try to run some more tests on them tomorrow or ...
In the mean time i am adding the below :

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28 Apr 2021 21:59 #207337 by tommylight
New PC:
-MB Asus ROG Strix B550-i Gaming
-AMD Ryzen 5 3600
-32GB HyperX 3600 CL16 (2X16GB)
-32GB NVME (yes 32, main drive)
-1TB Intel NVME ( not mounted, backup only )
-Saphire Radeon RX580 /8GB
-Cooler Master MasterCool 240 Lite water cooling
-Corsair CX550F RGB power supply
-Cooler Master NR200P case
-4.9.0-13-rt on Linux Mint 19.3, LinuxCNC 2.9/Master
And the result while doing things on the PC, doing a lot of things as can be seen on the bottom left side of the screen:



--NOT a recommendation, the above costs over 1000 Euro without the graphic card !!!
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19 May 2021 09:35 - 19 May 2021 09:38 #209472 by TheFarfar
I've been testing an old computer with Asus P5B-MX motherboard, 2x2GB RAM, Intel Core2 Q6600, 128 GB SSD and Nvidia GT210.
This is my result running 5 glxgears, 4k youtube video (auto quality) and stress -c 2 -i 1 -m 1 -d 1:



As you can see most of the time the latency is really solid but once in a while it spikes to really high values.
Not sure if this is something to be concerned about? As you can see it spiked 2 times in 5 minutes. Then there were 2 more spikes during the next 10 minutes.
Is there any way to trace what might cause the spike?
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Last edit: 19 May 2021 09:38 by TheFarfar. Reason: Added SSD info

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19 May 2021 10:41 #209476 by tommylight
For parallel port use it might cause issues, but either way you look at it RTAI kernel is much better for that.
For Mesa boards that is all fine as there is no need for a base period at all.

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19 May 2021 17:32 #209530 by TheFarfar
On Debian Wheezy with RTAI this computer performed slightly better with the Nvidia GT210 card but it seems it's much more solid with the built-in Intel GMA 3000 on Buster with preempt_rt. With the GT210 on Buster I get the latency posted earlier in thread.
Hardware is:
Asus P5B-MX, Intel Core2 Quad Q6600, 4 GB RAM (2x2 GB in dual channel), some 128 GB SSD i had laying around. Everything not needed disabled in BIOS.
Module pcspkr is not loaded, the script encounters an error when trying to detect if it's loaded.
Slight overclock for the CPU, running 290 MHz * 9 (266*9 stock). RAM running at 667 MHz.

Warning: Spoiler!

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19 May 2021 19:49 #209541 by tommylight
That looks very good even for software stepping.

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