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

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27 Sep 2020 16:35 #184003 by txtrone
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC

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
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by BeagleBrainz on topic Results of latency test, list of computers tested for use with LinuxCNC
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
Replied by txtrone on topic Results of latency test, list of computers tested for use with LinuxCNC

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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