Optiplex 980MT. At this point I'm chasing nanoseconds. This used a non-standard kernel, specifically the rt kernel from
. The standard kernels are giving good but not quite as good results so far.
Code:
LinuxCNC pc tests, version 20200930, started 06.06.2021 16:56:40
********************************************************************************
General info:
Dell Inc., OptiPlex 980
Bios version A18, dated 02/27/2018
Chipset: Intel Corporation 5 Series/3400 Series
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz
cpu cores : 2
stepping : 5
cache size : 4096 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Size: 4096 MB
Size: 4096 MB
Size: No Module Installed
Size: No Module Installed
================================================================================
GPU related data:
product: Core Processor Integrated Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 1
parport0: PC-style at 0x378 (0x778), irq 7, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]
================================================================================
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-l
atency
Desktop environment :
Windowmanager : e16
Displaymanager : lightdm
================================================================================
Kernel related data:
Kernel 5.10.41-rt42-xanmod1
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 mitigations=off intel_idle.max_cstate=0 pr
ocessor.max_cstate=0 idle=poll acpi_irq_nobalance noirqbalance"
Cpu idle driver: none
================================================================================
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: 3
Mouse 0 : Logitech USB Optical Mouse
Mouse 1 : CHESEN PS2 to USB Converter Mouse
Mouse 2 : CHESEN PS2 to USB Converter Mouse
Mice attached to USB:
Logitech, Inc. M105 Optical Mouse
Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter
Keyboards attached to USB:
Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.1
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 14680112
================================================================================
Command for latency test is:
su cadusr -c "latency-histogram --bbinsize 1000 --base 100000 --sbinsize 1000 --nox 2>
&1 | tee -a 1623023787.lat &"
Latency testing loop started Sun 06 Jun 2021 04:56:54 PM PDT,
should end after Sun 06 Jun 2021 06:56:54 PM PDT
================================================================================
Swap useage: prerun: 0, running: 0
================================================================================
CPU core temperatures:
Core 0: Tmin: 37.0°C, Tmax: 41.0°C, (high = +89.0°C, crit = +105.0°C)
Core 2: Tmin: 39.0°C, Tmax: 42.0°C, (high = +89.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
7202 secs base min: -9.400 uS max: 9.300 uS sdev: 0.300 uS
7202 secs servo min: -6.900 uS max: 6.900 uS sdev: 0.400 uS
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