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

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23 Jul 2022 20:17 #248143 by macsddau@linuxcnc
Replied by macsddau@linuxcnc on topic Results of latency test, list of computers tested for use with LinuxCNC
Here the results
LinuxCNC pc tests, version 20200930, started 23.07.2022 21:33:59
********************************************************************************
General info:
ASRock,  To Be Filled By O.E.M.
Bios version P1.90, dated 05/21/2018
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 J3355 @ 2.00GHz
cpu cores    : 2
stepping    : 9
cache size    : 1024 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Maximum Voltage: 1.5 V
Maximum Voltage: 1.5 V
Size: 8192 MB
Size: 8192 MB
================================================================================
GPU related data:
configuration: driver=i915 latency=0
configuration: driver=radeon latency=0
================================================================================
Parallel port related data:
number of parallel ports is 1
parport0: PC-style at 0x378, irq 5 [PCSPP]
================================================================================
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"

Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency

Desktop environment : xfce4
Windowmanager       : Xfwm4
Displaymanager      : lightdm
================================================================================
Kernel related data:
Kernel 4.19.0-16-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 nohalt irqaffinity=0"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: Yes, may cause bigger latency.
  can be eliminated using:
  sudo echo "install pcspkr /bin/true" >/etc/modprobe.d/pcspkr.conf
Check if snd modules are loaded: Yes, may cause bigger latency.
  can probably be disabled in bios, alternatively, you can run
   "./block-snd-modules"
   which has just now been created for your convenience.
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech USB Optical Mouse
Mice  attached to USB:
Logitech, Inc. M105 Optical Mouse
Keyboards attached to USB:
Logitech, Inc. Keyboard K120
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.2
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://www.youtube.com/watch?v=rknCD69n6Pk', WID
================================================================================
Command for latency test is:
su cnc -c  "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee -a 202207232133.lat &"

Latency testing loop started samedi 23 juillet 2022, 21:34:15 (UTC+0200),
should end after samedi 23 juillet 2022, 22:04:15 (UTC+0200)

================================================================================
Swap useage: prerun: 0, running: 0

================================================================================
CPU core temperatures:
Core 0: Tmin: 44.0°C, Tmax: 50.0°C, (high = +105.0°C, crit = +105.0°C)
Core 2: Tmin: 42.0°C, Tmax: 48.0°C, (high = +105.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
 1801 secs   base min:  -6.000 uS max:   6.600 uS sdev:   0.200 uS
 1801 secs  servo min:  -5.400 uS max:   5.400 uS sdev:   0.200 uS
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25 Jul 2022 14:34 #248258 by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC

1801 secs   base min:  -6.000 uS max:   6.600 uS sdev:   0.200 uS
 1801 secs  servo min:  -5.400 uS max:   5.400 uS sdev:   0.200 uAl

Although "only" 1801 secs, nice values! Congrats
chris
PS: I like it when a reboot solves problems :-)
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28 Jul 2022 15:34 - 28 Jul 2022 15:35 #248552 by ddB0515
Replied by ddB0515 on topic Results of latency test, list of computers tested for use with LinuxCNC
Here are my results on Lenovo M710q in pair with MESA 7i76E

LinuxCNC pc tests, version 20200930, started 28.07.2022 16:17:44
********************************************************************************
General info:
LENOVO,  10MQS36600
Bios version M1AKT52A, dated 12/24/2021
Chipset: Intel Corporation 200 Series/Z370 
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name  : Intel(R) Core(TM) i5-6400T CPU @ 2.20GHz
cpu cores : 4
stepping  : 3
cache size  : 6144 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Maximum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Size: 4 GB
Size: 4 GB
================================================================================
GPU related data:
product: HD Graphics 530
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"

Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency

Desktop environment : gnome
Windowmanager       : Mutter (Muffin)
Displaymanager      : lightdm
================================================================================
Kernel related data:
Kernel 5.10.0-16-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 noirqbalance mitigations=off nohlt idle=pool splash resume=UUID=73f68a61-1146-4abd-a9f9-d0f93ea00eb9"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: [0;32mNo, which is good![0m
Check if snd modules are loaded: [0;32mNo, which is good![0m
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : ELAN Touchscreen
Mouse 1 : Logitech K400 Plus
Mice  attached to USB:
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 
================================================================================
Command for latency test is:
su dale -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a 1659010854.lat &"

Latency testing loop started Thu 28 Jul 13:21:42 BST 2022, 
should end after Thu 28 Jul 15:21:42 BST 2022

================================================================================
Swap useage: prerun: 0, running: 0

================================================================================
CPU core temperatures:
Core 0: Tmin: 28.0°C, Tmax: 59.0°C, (high = +84.0°C, crit = +100.0°C)
Core 1: Tmin: 29.0°C, Tmax: 60.0°C, (high = +84.0°C, crit = +100.0°C)
Core 2: Tmin: 30.0°C, Tmax: 59.0°C, (high = +84.0°C, crit = +100.0°C)
Core 3: Tmin: 29.0°C, Tmax: 58.0°C, (high = +84.0°C, crit = +100.0°C)
================================================================================
last latency data is as follows:.
 7194 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7195 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7196 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7197 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7198 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7198 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
 7199 s  servo min:-113.900 us max: 106.000 us sdev:  11.400 us
Core 0:        +57.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:        +59.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:        +58.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:        +57.0°C  (high = +84.0°C, crit = +100.0°C)

BIOS is mostly setup as recommended-off (Virtualisation, Hyperthreading, Turbo, Speedstep)
I know this is OK but if I find ways to optimise will post results
Last edit: 28 Jul 2022 15:35 by ddB0515.
The following user(s) said Thank You: seuchato, tommylight

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15 Sep 2022 15:13 - 16 Sep 2022 05:28 #252004 by boozeman
Replied by boozeman on topic Results of latency test, list of computers tested for use with LinuxCNC
Hi,

EDIT: 7i76S --> 7i96S, just a typo!

There's an one hour test with Lenovo ThinkCentre M910Q in pair with MESA 7i96S. System has nVme-disk so even Sata-bus is disabled. All normal shenanigans in Bios are made. I also add the isolcpus=2,3 in Grub config.

I changed script a bit to show some Unreal Engine 5 demovideo and do some internet search during the test.

LinuxCNC pc tests, version 20200930, started 15.09.2022 15:11:32
********************************************************************************
General info:
LENOVO,  10MUS6MP00
Bios version M1AKT56A, dated 07/27/2022
Chipset: Intel Corporation 200 Series/Z370
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name    : Intel(R) Core(TM) i5-6500T CPU @ 2.50GHz
cpu cores    : 4
stepping    : 3
cache size    : 6144 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Maximum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Size: 8 GB
Size: 16 GB
================================================================================
GPU related data:
product: HD Graphics 530
configuration: depth=32 driver=i915 latency=0 resolution=1920,1200
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux bookworm/sid"

Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency

Desktop environment : lightdm
Windowmanager       : Xfwm4
Displaymanager      : lightdm
================================================================================
Kernel related data:
Kernel 5.19.0-1-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=2,3"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Device USB Device
Mice  attached to USB:
Keyboards attached to USB:
Holtek Semiconductor, Inc. Portable Keyboard
================================================================================
LinuxCNC related data:
LinuxCNC version is: 9.0~pre0+git20220906.02744cdef6-1
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/417882964', WID 62914604
================================================================================
Command for latency test is:
su viinatim -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a 1663243877.lat &"

Latency testing loop started to 15.9.2022 15.11.45 +0300,
should end after to 15.9.2022 16.11.45 +0300

================================================================================
Swap useage: prerun: 0, running: 0

================================================================================
CPU core temperatures:
Core 0: Tmin: 31.0°C, Tmax: 57.0°C, (high = +84.0°C, crit = +100.0°C)
Core 1: Tmin: 30.0°C, Tmax: 57.0°C, (high = +84.0°C, crit = +100.0°C)
Core 2: Tmin: 28.0°C, Tmax: 52.0°C, (high = +84.0°C, crit = +100.0°C)
Core 3: Tmin: 28.0°C, Tmax: 54.0°C, (high = +84.0°C, crit = +100.0°C)
================================================================================
last latency data is as follows:.
 3599 s  servo min: -48.300 us max:  45.000 us sdev:   3.500 us
 3600 s  servo min: -48.300 us max:  45.000 us sdev:   3.500 us
 3600 s  servo min: -48.300 us max:  45.000 us sdev:   3.500 us
 3601 s  servo min: -48.300 us max:  45.000 us sdev:   3.500 us
 3602 s  servo min: -48.300 us max:  45.000 us sdev:   3.500 us
 3602 s  servo min: -48.300 us max:  45.000 us sdev:   3.600 us
Core 0:        +54.0°C  (high = +84.0°C, crit = +100.0°C)
Core 1:        +52.0°C  (high = +84.0°C, crit = +100.0°C)
Core 2:        +51.0°C  (high = +84.0°C, crit = +100.0°C)
Core 3:        +53.0°C  (high = +84.0°C, crit = +100.0°C)
Last edit: 16 Sep 2022 05:28 by boozeman.
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15 Sep 2022 15:53 #252007 by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
boozeman
good looking! Would be suitable even for parport, I guess.
I have a set of similar hp elitedesk 800 G2, also sporting an i5 6500. Will test them soon
greez
chris

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15 Sep 2022 18:02 - 09 Oct 2022 09:02 #252016 by tommylight
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC
7i76S ???
To be sure it will work properly for longer, since you already have the 7i96S i assume, wire the +5V and ethernet cable, run linuxcnc and leave it on for a day or two while occasionally doing something else on the PC.
I usually leave it for 2 to 5 days just to be sure.
Last edit: 09 Oct 2022 09:02 by tommylight. Reason: typo

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09 Oct 2022 04:40 #253800 by Bari
Replied by Bari on topic Results of latency test, list of computers tested for use with LinuxCNC
  Note: Using LXRT realtime
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11 Nov 2022 12:27 #256422 by D.L.
Replied by D.L. on topic Results of latency test, list of computers tested for use with LinuxCNC
MB  GA-J1800N-D2H(BIOS F6)
RAM KVR13S9S8/4 4Gb
SSD SA400S37/240G
Debian Wheezy 3.2.0-6-rt-686-pae
LinuxCNC v. 2.8.4 rip build

kernel parameters: "isolcpus=0 intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll quiet"
 
kernel parameters: "isolcpus=1 intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll quiet"
 
 
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13 Nov 2022 19:51 #256600 by D.L.
Replied by D.L. on topic Results of latency test, list of computers tested for use with LinuxCNC
Old test of this hardware(with HDD).
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"
 
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15 Nov 2022 19:56 #256797 by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC

Old test of this hardware(with HDD).
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"
 
 


D.L.
The results are nice and seem to support my assumption, rotational discs hamper latency - on first sight. A closer look shows, one test is with 5 glxgears and the other with 10. So: are these two results really comparable in terms of reproducibility?

I am working on updating the script as promised right now. No ETA so far. It will address the bugs recorded up to date and have some enhancements too. So, stay tuned :-)
greez chris
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