LinuxCNC pc tests, version 20200930, started 19.02.2021 11:52:52
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General info:
Dell Inc.,  OptiPlex 780                 
Bios version A15, dated 08/06/2013
Chipset: Intel Corporation 4 Series 
Harddisk is rotational
The amount of swap currently used is 0
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CPU related data:
model name        : Intel(R) Core(TM)2 Duo CPU     E4500  @ 2.20GHz
cpu cores        : 2
stepping        : 13
cache size        : 2048 KB
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RAM related data:
Maximum Capacity: 8 GB
Size: 2048 MB
Size: No Module Installed
Size: 2048 MB
Size: No Module Installed
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GPU related data:
product: 4 Series Chipset Integrated Graphics Controller
product: 4 Series Chipset Integrated Graphics Controller
configuration: driver=i915 latency=0
configuration: latency=0
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Parallel port related data:
number of parallel ports is 1
parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,EPP]
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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
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Kernel related data:
Kernel 4.19.0-11-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
Cpu idle driver: none
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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. 
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Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech G300s Optical Gaming Mouse
Mice  attached to USB:
Keyboards attached to USB:
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LinuxCNC related data:
LinuxCNC version is: 2.8.1
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Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 62914563
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Command for latency test is:
su linuxcnc -c  "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee -a 1613731961.lat &"


Latency testing loop started vie feb 19 11:53:06 CET 2021, 
should end after vie feb 19 13:53:06 CET 2021
Useless to proceed, read the relevant part in 1613731961.lat
 


>>>Unexpected realtime delay on task 0 with period 50000<<<


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Swap useage: prerun: 0, running: 0


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CPU core temperatures:
Core 0: Tmin: 51.0°C, Tmax: 58.0°C, (high = +86.0°C, crit = +100.0°C)
Core 1: Tmin: 51.0°C, Tmax: 58.0°C, (high = +86.0°C, crit = +100.0°C)
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last latency data is as follows:.
   92 secs   base min: -29.700 uS max:  44.300 uS sdev:   1.800 uS
   92 secs  servo min: -29.000 uS max:  27.700 uS sdev:   1.800 uS