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

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28 Aug 2020 11:47 #179821 by seuchato
Who do you want to direct you?

And: In all honesty and respect, kindly note: this thread is on the RESULTS of the script I pointed you to.
I think, encourage and suggest, you open a new thread on the progress you make with your HP-500B. This way, the thread here sticks to the results and can serve as a lookup base for anyone searching for a specific pc.

greez chris
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28 Aug 2020 11:53 #179823 by tommylight

seuchato wrote:

Bari wrote: The main problem I have found with big name business PC has been the poor BIOS installed. They trim features out such as the ability to turn off power management, virtualization and speed steeping for less problems with tech support.

For best latency test results I always recommend a motherboard with a full featured BIOS. The gaming versions usually have all the features left in the menus for BIOS tweaking.


100% agreed!

+1
I do have 3 of the ASUS A270Z PRO MB in use, but not for machines ! :) They are busy mining ethereum.
But my math is simple, for the price of the A270Z PRO i can buy a Dell or a HP or a Fujitsu with a 24' monitor !
Asus J1800 was a different story as it came with a processor so add a memory module and a power supply and off it goes, at a price of 89 Euro that was very good. I did say was as i can not find them any more locally.

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28 Aug 2020 11:58 #179824 by shortcircuit48
With my limited knowledge I was attempting to comply and be as descriptive as possible, possibly incorrectly. Will post as suggested. Thanks
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28 Aug 2020 15:20 #179847 by aparecido
1598626490.hw
LinuxCNC pc tests, version 20200624, started 28.08.2020 11:54:51
********************************************************************************
General info:
Itautec S.A., Infoway
Bios version 0110, dated 03/02/2009
Chipset: Harddisk is rotational
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
cpu cores : 1
stepping : 10
cache size : 3072 KB
================================================================================
RAM related data:
Maximum Memory Module Size: 4096 MB
Maximum Total Memory Size: 8192 MB
Maximum Capacity: 16 GB
Maximum Memory Module Size: 4096 MB
Maximum Total Memory Size: 8192 MB
Installed Size: 2048 MB (Double-bank Connection)
Enabled Size: 2048 MB (Double-bank Connection)
Installed Size: 2048 MB (Double-bank Connection)
Enabled Size: 2048 MB (Double-bank Connection)
Size: 2048 MB
Size: 2048 MB
================================================================================
GPU related data:
================================================================================
Os related data:
PRETTY_NAME="Linux Mint 19.3"
Desktop: , Session:
================================================================================
Kernel related data:
Kernel 5.4.0-0.bpo.4-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Cpu idle driver: none
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, good!
Yes, may cause bigger latency.
Check if snd modules are loaded: No, good!
Yes, may cause bigger latency.
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : ImPS/2 Generic Wheel Mouse
Mice attached to USB:
Keyboards attached to USB:
LinuxCNC related data:
LinuxCNC version is: 2.8.0~pre3.31.gb7c7ab5aa
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with ' vimeo.com/150574260 '

================================================================================
Command for latency test is:
su aparecido -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1598626490.lat &"

Latency testing loop started sex ago 28 11:55:06 -03 2020,
should end after sex ago 28 13:55:06 -03 2020

Unexpected realtime delay on task 0 with period 25000
should end after sex ago 28 13:55:06 -03 2020

Swap useage: prerun: 0, running: 0

================================================================================
last latency data is as follows:.
12 secs base min: -24.800 uS max: 51.700 uS sdev: 2.000 uS
12 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.500 uS

1598626490.lat
Note: Using POSIX realtime
Unexpected realtime delay on task 0 with period 25000
This Message will only display once per session.
Run the Latency Test and resolve before continuing.
0 secs base min: -24.700 uS max: 21.300 uS sdev: 2.200 uS
0 secs servo min: -15.500 uS max: 15.900 uS sdev: 7.600 uS
2 secs base min: -24.700 uS max: 23.000 uS sdev: 2.000 uS
2 secs servo min: -21.700 uS max: 18.600 uS sdev: 7.200 uS
3 secs base min: -24.700 uS max: 23.000 uS sdev: 2.000 uS
3 secs servo min: -21.700 uS max: 22.800 uS sdev: 7.200 uS
5 secs base min: -24.700 uS max: 23.000 uS sdev: 2.000 uS
5 secs servo min: -21.700 uS max: 22.800 uS sdev: 7.300 uS
6 secs base min: -24.700 uS max: 23.000 uS sdev: 2.000 uS
6 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.400 uS
7 secs base min: -24.700 uS max: 23.000 uS sdev: 2.000 uS
7 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.500 uS
9 secs base min: -24.800 uS max: 23.000 uS sdev: 2.000 uS
9 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.400 uS
10 secs base min: -24.800 uS max: 23.000 uS sdev: 2.000 uS
10 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.500 uS
12 secs base min: -24.800 uS max: 51.700 uS sdev: 2.000 uS
12 secs servo min: -22.300 uS max: 22.800 uS sdev: 7.500 uS

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28 Aug 2020 18:35 #179866 by tommylight
@aparecido
That is some really nice improvement and it is very usable now.
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28 Aug 2020 18:37 - 28 Aug 2020 18:38 #179867 by aparecido

tommylight wrote: @aparecido
That is some really nice improvement and it is very usable now.

So can I configure to use linuxcnc without a problem? I didn't understand this information well, what jitter value should I put?

The maximum value was 22800ns? Is this the value shown in the 'latency test' that comes with the linux cnc package? So ... should I put 23000ns in the configuration?
Last edit: 28 Aug 2020 18:38 by aparecido.

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28 Aug 2020 18:47 #179868 by tommylight
You had a spike of 51000ns at the end when the script exited, but try to use 5000ns and when running LinuxCNC check if you get latency errors.
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28 Aug 2020 19:18 #179870 by aparecido

tommylight wrote: You had a spike of 51000ns at the end when the script exited, but try to use 5000ns and when running LinuxCNC check if you get latency errors.

50000ns on the jitter in the configuration, right?

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28 Aug 2020 20:09 #179874 by tommylight

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30 Aug 2020 00:52 #179989 by JohnnyCNC
These are my results using Mint 20 with Mate desktop. Without isolcpus or with isolcpus=0 the latency goes way up. I am using this with a Mesa 6i25+7i76
LinuxCNC pc tests, version 20200624, started 28.08.2020 20:38:32
********************************************************************************
General info:
ECS,  BAT-I
Bios version 5.6.5, dated 01/18/2016
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name	: Intel(R) Celeron(R) CPU  J1800  @ 2.41GHz
cpu cores	: 2
stepping	: 8
cache size	: 1024 KB
================================================================================
RAM related data:
Maximum Capacity: 8 GB
Maximum Voltage: 1.5 V
Size: 8192 MB
================================================================================
GPU related data:
product: Atom Processor Z36xxx/Z37xxx Series Graphics & Display
configuration: driver=i915 latency=0
================================================================================
Os related data:
PRETTY_NAME="Linux Mint 20"
Desktop: , Session: 
================================================================================
Kernel related data:
Kernel 4.9.0-13-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 splash"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, good!
Yes, may cause bigger latency.
Check if snd modules are loaded: No, good!
Yes, may cause bigger latency.
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech M215 2nd Gen
Mice  attached to USB:
Keyboards attached to USB:
LinuxCNC related data:
LinuxCNC version is: 2.8.0~pre3.50.g2fe8ba3c9
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
Started glxgears No. 6
..........
Started firefox with 'https://vimeo.com/150574260' 

================================================================================
Command for latency test is:
su john -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee  1598661497.lat &"

Latency testing loop started Fri 28 Aug 2020 08:38:57 PM EDT, 
should end after Fri 28 Aug 2020 10:38:57 PM EDT

Swap useage: prerun: 0, running: 0

================================================================================
last latency data is as follows:.
 7201 secs  servo min: -57.700 uS max:  64.300 uS sdev:   6.200 uS
 7202 secs  servo min: -57.700 uS max:  64.300 uS sdev:   6.200 uS
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