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

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27 Sep 2020 16:35 #184003 by txtrone
Same Lenovo E430 running Buster.
LinuxCNC pc tests, version 20200922, started 26.09.2020 21:18:32
********************************************************************************
General info:
LENOVO,  3254CTO
Bios version H0ET98WW (2.58 ), dated 08/18/2016
Chipset: Intel Corporation 7 Series/C216 
Harddisk is rotational
The amount of swap currently used is 0
================================================================================
CPU related data:
model name	: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
cpu cores	: 1
stepping	: 9
cache size	: 3072 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Size: No Module Installed
Size: 4096 MB
================================================================================
GPU related data:
product: 3rd Gen Core processor Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Windowmanager = 
================================================================================
Kernel related data:
Kernel 4.19.0-10-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: Yes, may cause bigger latency.
  can be elimintaed 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
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : SynPS/2 Synaptics TouchPad
Mouse 1 : TPPS/2 IBM TrackPoint
Mice  attached to USB:
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.0
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 50331651
================================================================================
Command for latency test is:
su oldlt -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a 1601173111.lat &"

Latency testing loop started Sat 26 Sep 2020 09:18:47 PM CDT, 
should end after Sat 26 Sep 2020 11:18:47 PM CDT

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

================================================================================
CPU core temperatures:
Core 0: Tmin: 49.0°C, Tmax: 61.0°C, (high = +87.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
 7199 secs  servo min: -90.800 uS max:  98.400 uS sdev:   2.500 uS
 7200 secs  servo min: -90.800 uS max:  98.400 uS sdev:   2.500 uS
The following user(s) said Thank You: seuchato

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27 Sep 2020 19:59 #184021 by txtrone
Same Lenovo E430, but I replaced the 7200rpm HDD with a SanDisk SSD
LinuxCNC pc tests, version 20200922, started 27.09.2020 12:06:05
********************************************************************************
General info:
LENOVO,  3254CTO
Bios version H0ET98WW (2.58 ), dated 08/18/2016
Chipset: Intel Corporation 7 Series/C216 
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name	: Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz
cpu cores	: 1
stepping	: 9
cache size	: 3072 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Size: No Module Installed
Size: 4096 MB
================================================================================
GPU related data:
product: 3rd Gen Core processor Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Windowmanager = 
================================================================================
Kernel related data:
Kernel 4.19.0-10-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: Yes, may cause bigger latency.
  can be elimintaed 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
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : SynPS/2 Synaptics TouchPad
Mouse 1 : TPPS/2 IBM TrackPoint
Mice  attached to USB:
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.0
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 46137347
================================================================================
Command for latency test is:
su oldlt -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a 1601226348.lat &"

Latency testing loop started Sun 27 Sep 2020 12:06:19 PM CDT, 
should end after Sun 27 Sep 2020 02:06:19 PM CDT

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

================================================================================
CPU core temperatures:
Core 0: Tmin: 55.0°C, Tmax: 68.0°C, (high = +87.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
 7203 secs  servo min:-173.400 uS max: 167.900 uS sdev:   7.700 uS
 7204 secs  servo min:-173.400 uS max: 167.900 uS sdev:   7.700 uS
The following user(s) said Thank You: seuchato

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27 Sep 2020 20:32 #184031 by tommylight
Strange, worse results with an SSD than with a HDD !
The results with HDD look very promising, but that might change with load.
Thank you for all the testing and results.

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27 Sep 2020 20:36 #184032 by txtrone
That surprised me too! When it comes to SDD is there a read/write speed that works better? Or maybe a setting in the bios? AHCI vs compatibility mode?? thx

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27 Sep 2020 20:52 #184043 by tommylight
I do not think it is the read/write speed, more likely it is caused by access time.

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27 Sep 2020 20:54 #184045 by tommylight

txtrone wrote: Or maybe a setting in the bios? AHCI vs compatibility mode?? thx

I always set it to AHCI and whenever possible disable serial-ata power saving.

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27 Sep 2020 20:54 #184046 by txtrone
Interesting. I am going to try a different SSD and more memory in this laptop over the next week.

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27 Sep 2020 20:56 #184048 by txtrone
RPi4 with 4GB memory
LinuxCNC pc tests, version 20200922, started 26.09.2020 22:10:45
********************************************************************************
General info:
,  
Bios version , dated Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name	: ARMv7 Processor rev 3 (v7l)
================================================================================
RAM related data:
================================================================================
GPU related data:
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os related data:
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
Windowmanager = 
================================================================================
Kernel related data:
Kernel 4.19.71-rt24-v7l+
Cpu idle driver: ================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: Yes, may cause bigger latency.
can probably be disabled in bios
================================================================================
Keyboard & Mouse related data:
Number of mice: 0
Mice  attached to USB:
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.0
================================================================================
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 pi -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee -a 1601176201.lat &"

Latency testing loop started Sat 26 Sep 2020 10:11:03 PM CDT, 
should end after Sun 27 Sep 2020 12:11:03 AM CDT

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

================================================================================
CPU core temperatures:
================================================================================
last latency data is as follows:.
 7203 secs  servo min:-126.900 uS max: 146.900 uS sdev:   2.600 uS
 7203 secs  servo min:-126.900 uS max: 146.900 uS sdev:   2.600 uS
The following user(s) said Thank You: seuchato

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27 Sep 2020 20:59 #184050 by BeagleBrainz
Why is there only a single core being reported for a I5-3210M ?
Have you disabled a core in the BIOS or is there an issue with the script ?
Are you reading all of the report or just the latency ?
The following user(s) said Thank You: seuchato

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27 Sep 2020 21:00 #184051 by txtrone

tommylight wrote: I always set it to AHCI and whenever possible disable serial-ata power saving.


AHCI was on already, let me check if there is any serial-ata power saving options.

I cannot find anything about snd modules in the bios? Otherwise I would disable them?

I have all the mutli threads per core and hyper threading turned off as well. Is that recommended?

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