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Results of latency test, list of computers tested for use with LinuxCNC
- tommylight
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20 Jun 2020 22:32 - 21 Jun 2020 15:00 #172202
by tommylight
Post the results of latency tests you have done on PC's and Laptops / Notebooks using the script downloaded from here:
forum.linuxcnc.org/18-computer/39370-scr...-of-computer-latency
Open the saved file with the ".hw" extension and paste the results here as code, or just attach that file here.
-This is meant as a database of what works, what is usable and what to avoid from the old and new computers, to have comparative results that can be used as a general guideline for choosing a computer for machine control.
-The script and the results are offered "as is" and therefore hold no liability, implicit or otherwise.
--Here is a link to some latency tests done before this script was in use, older pc's and laptops and some new ones:
forum.linuxcnc.org/18-computer/38838-har...ts-used-pc-s?start=0
forum.linuxcnc.org/18-computer/39370-scr...-of-computer-latency
Open the saved file with the ".hw" extension and paste the results here as code, or just attach that file here.
-This is meant as a database of what works, what is usable and what to avoid from the old and new computers, to have comparative results that can be used as a general guideline for choosing a computer for machine control.
-The script and the results are offered "as is" and therefore hold no liability, implicit or otherwise.
--Here is a link to some latency tests done before this script was in use, older pc's and laptops and some new ones:
forum.linuxcnc.org/18-computer/38838-har...ts-used-pc-s?start=0
Last edit: 21 Jun 2020 15:00 by tommylight. Reason: More info
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20 Jun 2020 22:39 - 20 Jun 2020 22:46 #172205
by tommylight
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC
Here are the results of a Lenovo ThinkCentre M93, running for 2 minutes only, with no base thread:
LinuxCNC pc tests, version 20200619-c
********************************************************************************
General info:
LENOVO, 10A8S1BX0N
Bios version FBKT75AUS, dated 04/01/2014
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 8464
================================================================================
CPU related data:
model name : Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz
cpu cores : 4
stepping : 3
cache size : 6144 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Maximum Voltage: Unknown
Maximum Voltage: Unknown
Maximum Voltage: 1.5 V
Maximum Voltage: 1.5 V
Size: No Module Installed
Size: No Module Installed
Size: 4096 MB
Size: 2048 MB
================================================================================
GPU related data:
product: Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Os related data:
PRETTY_NAME="Linux Mint 19.3"
Desktop: , Session:
================================================================================
Kernel related data:
Kernel 5.4.0-0.bpo.4-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Cpu idle driver: intel_idle
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : USB OPTICAL MOUSE
Mice attached to USB:
Keyboards attached to USB:
Dell Computer Corp. Multimedia Pro Keyboard
Dell Computer Corp. Multimedia Pro Keyboard Hub
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.2237.g829ce3e65
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
Latency testing loop started Sun Jun 21 00:39:38 CEST 2020,
su cnc -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee 1592692755.lat &"
command for latency test is:
should end after Sun Jun 21 00:41:38 CEST 2020
Swap useage: prerun: 8464, running: 8464
================================================================================
last latency data is as follows:.
125 secs servo min: -74.000 uS max: 85.600 uS sdev: 7.700 uS
126 secs servo min: -74.000 uS max: 85.600 uS sdev: 7.700 uS
Last edit: 20 Jun 2020 22:46 by tommylight. Reason: results
The following user(s) said Thank You: seuchato
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22 Jun 2020 09:19 - 19 Oct 2020 11:17 #172308
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
OptiPlex 980, i5 CPU 650 @ 3.20GHz
Result with Buster
Result with mint:
PC seems suitable using Buster and kernel 4.19.0-9-rt-amd64. Not useable using mint and kernel 5.4.0-0.bpo.4-rt-amd64. Il try to use 4.19.0-9-rt-amd64 with mint and add the result here when done.
Greez
chris
Edit 19. Oct. 2020:
For BIOS settings, see this post here , at the bottom. Best BIOS version is A18.
Result with Buster
LinuxCNC pc tests, version 20200619-b
********************************************************************************
General info:
Dell Inc., OptiPlex 980
Bios version A04, dated 09/11/2010
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 1652
================================================================================
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: 2048 MB
Size: 2048 MB
Size: No Module Installed
Size: No Module Installed
================================================================================
GPU related data:
product: Core Processor Integrated Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Desktop: KDE, Session:
================================================================================
Kernel related data:
Kernel 4.19.0-9-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1 "
Cpu idle driver: none
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech USB Receiver
Mice attached to USB:
Logitech, Inc. Cordless Mouse Receiver
Keyboards attached to USB:
MosArt Semiconductor Corp. Defender Office Keyboard (K7310) S Zodiak KM-9010
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.2237.g829ce3e65
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
Latency testing loop started Fr Jun 19 17:59:28 CEST 2020,
should end after Fr Jun 19 19:59:28 CEST 2020
command for latency test is:
su xx -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1592582351.lat &"
Cleaning up
Closing browser firefox
termiated latency ...
.terminated glxgears ...
.| .
7206 secs servo min: -19.300 uS max: 17.800 uS sdev: 0.700 uS
7208 secs base min: -19.900 uS max: 17.600 uS sdev: 0.300 uS
Result with mint:
LinuxCNC pc tests, version 20200622-pre
********************************************************************************
General info:
Dell Inc., OptiPlex 980
Bios version A04, dated 09/11/2010
Chipset: Intel Corporation 5 Series/3400 Series Chipset
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: 2048 MB
Size: 2048 MB
Size: No Module Installed
Size: No Module Installed
================================================================================
GPU related data:
================================================================================
Os related data:
PRETTY_NAME="Linux Mint 19.3"
Desktop: MATE, Session: mate
================================================================================
Kernel related data:
Kernel 5.4.0-0.bpo.4-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1 "
Cpu idle driver: intel_idle
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech USB Receiver
Mice attached to USB:
Logitech, Inc. Cordless Mouse Receiver
Keyboards attached to USB:
Creative Labs Defender Office Keyboard (K7310) S Zodiak KM-9010
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.2245.g09397b8d3
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
should end after Mo Jun 22 11:14:46 CEST 2020
Latency testing loop started Mo Jun 22 09:14:46 CEST 2020,
command for latency test is:
su xx -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1592810064.lat &"
Unexpected realtime delay on task 0 with period 25000
should end after Mo Jun 22 11:14:46 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
164 secs base min: -20.000 uS max: 22.000 uS sdev: 0.800 uS
164 secs servo min: -18.100 uS max: 16.900 uS sdev: 0.800 uS
PC seems suitable using Buster and kernel 4.19.0-9-rt-amd64. Not useable using mint and kernel 5.4.0-0.bpo.4-rt-amd64. Il try to use 4.19.0-9-rt-amd64 with mint and add the result here when done.
Greez
chris
Edit 19. Oct. 2020:
For BIOS settings, see this post here , at the bottom. Best BIOS version is A18.
Last edit: 19 Oct 2020 11:17 by seuchato. Reason: 19. Oct. 2020: Added reference to BIOS Settings and Version
The following user(s) said Thank You: tommylight, johnmc1
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23 Jun 2020 10:41 - 23 Jun 2020 10:42 #172460
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Same machine on Mint with kernel 4.9.0-12-rt-amd64:
So, it is not mint, but the kernel.
LinuxCNC pc tests, version 20200622-pre
********************************************************************************
General info:
Dell Inc., OptiPlex 980
Bios version A04, dated 09/11/2010
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: 2048 MB
Size: 2048 MB
Size: No Module Installed
Size: No Module Installed
================================================================================
GPU related data:
================================================================================
Os related data:
PRETTY_NAME="Linux Mint 19.3"
Desktop: MATE, Session: mate
================================================================================
Kernel related data:
Kernel 4.9.0-12-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1 "
Cpu idle driver: none
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : Logitech USB Receiver
Mouse 1 : USB-compliant keyboard
Mice attached to USB:
Logitech, Inc. Cordless Mouse Receiver
Keyboards attached to USB:
Creative Labs Defender Office Keyboard (K7310) S Zodiak KM-9010
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.2245.g09397b8d3
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
Latency testing loop started Di Jun 23 09:16:06 CEST 2020,
should end after Di Jun 23 11:16:06 CEST 2020
command for latency test is:
su xx -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1592896550.lat &"
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7205 secs base min: -19.600 uS max: 18.700 uS sdev: 0.200 uS
7205 secs servo min: -26.700 uS max: 26.700 uS sdev: 0.700 uS
So, it is not mint, but the kernel.
Last edit: 23 Jun 2020 10:42 by seuchato.
The following user(s) said Thank You: tommylight, johnmc1
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23 Jun 2020 16:13 #172484
by tommylight
Replied by tommylight on topic Results of latency test, list of computers tested for use with LinuxCNC
Mint will have a bit worse latency than Debian overall, but not by much. Kernel plays much more on latencySo, it is not mint, but the kernel.
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23 Jun 2020 19:28 #172496
by chimeno
Replied by chimeno on topic Results of latency test, list of computers tested for use with LinuxCNC
Hello everyone, here are my results with my pc to experiment, very good program.
regards
Chimeno
LinuxCNC pc tests, version 20200619-c
********************************************************************************
General info:
Gigabyte Technology Co., Ltd., P35-DS4
Bios version F14, dated 06/19/2009
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz
cpu cores : 4
stepping : 11
cache size : 4096 KB
================================================================================
RAM related data:
Maximum Memory Module Size: 1024 MB
Maximum Total Memory Size: 4096 MB
Maximum Capacity: 4 GB
Maximum Memory Module Size: 1024 MB
Maximum Total Memory Size: 4096 MB
Installed Size: 2048 MB (Single-bank Connection)
Enabled Size: 2048 MB (Single-bank Connection)
Installed Size: 2048 MB (Single-bank Connection)
Enabled Size: 2048 MB (Single-bank Connection)
Installed Size: 2048 MB (Single-bank Connection)
Enabled Size: 2048 MB (Single-bank Connection)
Installed Size: Not Installed
Enabled Size: Not Installed
Size: 2048 MB
Size: 2048 MB
Size: 2048 MB
Size: No Module Installed
================================================================================
GPU related data:
product: Cypress PRO [Radeon HD 5850]
configuration: driver=radeon latency=0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 9 (stretch)"
Desktop: , Session:
================================================================================
Kernel related data:
Kernel 4.9.0-11-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
Cpu idle driver: none
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech USB Receiver
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
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
Latency testing loop started mar jun 23 19:35:35 CEST 2020,
should end after mar jun 23 21:35:35 CEST 2020
su cnc -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1592933718.lat &"
command for latency test is:
Unexpected realtime delay on task 0 with period 25000
should end after mar jun 23 21:35:35 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
8 secs servo min: -23.600 uS max: 23.300 uS sdev: 1.200 uS
10 secs base min: -24.600 uS max: 104.200 uS sdev: 1.500 uS
H/W path Device Class Description
==============================================================
system P35-DS4
/0 bus P35-DS4
/0/0 memory 128KiB BIOS
/0/4 processor Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz
/0/4/a memory 64KiB L1 cache
/0/4/b memory 4MiB L2 cache
/0/19 memory 6GiB System Memory
/0/19/0 memory 2GiB DIMM 800 MHz (1,2 ns)
/0/19/1 memory 2GiB DIMM 800 MHz (1,2 ns)
/0/19/2 memory 2GiB DIMM 800 MHz (1,2 ns)
/0/19/3 memory DIMM [empty]
/0/100 bridge 82G33/G31/P35/P31 Express DRAM Controller
/0/100/1 bridge 82G33/G31/P35/P31 Express PCI Express Root Port
/0/100/1/0 display Cypress PRO [Radeon HD 5850]
/0/100/1/0.1 multimedia Cypress HDMI Audio [Radeon HD 5830/5850/5870 / 6850/6870 Rebrand]
/0/100/1a bus 82801I (ICH9 Family) USB UHCI Controller #4
/0/100/1a/1 usb2 bus UHCI Host Controller
/0/100/1a/1/2 input USB Receiver
/0/100/1a.1 bus 82801I (ICH9 Family) USB UHCI Controller #5
/0/100/1a.1/1 usb4 bus UHCI Host Controller
/0/100/1a.2 bus 82801I (ICH9 Family) USB UHCI Controller #6
/0/100/1a.2/1 usb5 bus UHCI Host Controller
/0/100/1a.7 bus 82801I (ICH9 Family) USB2 EHCI Controller #2
/0/100/1a.7/1 usb1 bus EHCI Host Controller
/0/100/1b multimedia 82801I (ICH9 Family) HD Audio Controller
/0/100/1c bridge 82801I (ICH9 Family) PCI Express Port 1
/0/100/1c.1 bridge 82801I (ICH9 Family) PCI Express Port 2
/0/100/1c.1/0 eth1 network 82572EI Gigabit Ethernet Controller (Copper)
/0/100/1c.4 bridge 82801I (ICH9 Family) PCI Express Port 5
/0/100/1c.4/0 storage JMB363 SATA/IDE Controller
/0/100/1c.4/0.1 storage JMB363 SATA/IDE Controller
/0/100/1c.5 bridge 82801I (ICH9 Family) PCI Express Port 6
/0/100/1c.5/0 eth0 network RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
/0/100/1d bus 82801I (ICH9 Family) USB UHCI Controller #1
/0/100/1d/1 usb6 bus UHCI Host Controller
/0/100/1d/1/1 communication Bluetooth Dongle (HCI mode)
/0/100/1d.1 bus 82801I (ICH9 Family) USB UHCI Controller #2
/0/100/1d.1/1 usb7 bus UHCI Host Controller
/0/100/1d.2 bus 82801I (ICH9 Family) USB UHCI Controller #3
/0/100/1d.2/1 usb8 bus UHCI Host Controller
/0/100/1d.7 bus 82801I (ICH9 Family) USB2 EHCI Controller #1
/0/100/1d.7/1 usb3 bus EHCI Host Controller
/0/100/1d.7/1/2 scsi10 storage USB2.0 Card Reader
/0/100/1d.7/1/2/0.0.0 /dev/sdc disk Reader
/0/100/1d.7/1/2/0.0.0/0 /dev/sdc disk
/0/100/1e bridge 82801 PCI Bridge
/0/100/1e/6 bus TSB43AB23 IEEE-1394a-2000 Controller (PHY/Link)
/0/100/1f bridge 82801IR (ICH9R) LPC Interface Controller
/0/100/1f.2 storage SATA Controller [RAID mode]
/0/100/1f.3 bus 82801I (ICH9 Family) SMBus Controller
/0/1 scsi2 storage
/0/1/0.0.0 /dev/sda disk 250GB WDC WD2500AAJS-7
/0/1/0.0.0/1 /dev/sda1 volume 226GiB EXT4 volume
/0/1/0.0.0/2 /dev/sda2 volume 6141MiB Extended partition
/0/1/0.0.0/2/5 /dev/sda5 volume 6141MiB Linux swap volume
/0/2 scsi5 storage
/0/2/0.0.0 /dev/sdb disk 1TB TOSHIBA MG03ACA1
/0/2/0.0.0/1 /dev/sdb1 volume 925GiB EXT4 volume
/0/2/0.0.0/2 /dev/sdb2 volume 6141MiB Extended partition
/0/2/0.0.0/2/5 /dev/sdb5 volume 6141MiB Linux swap volume
Chimeno
The following user(s) said Thank You: seuchato, tommylight
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24 Jun 2020 09:49 #172557
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
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25 Jun 2020 03:21 - 18 Sep 2020 06:34 #172681
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Results for a hp 8300 sff, had to set interval for base thread to 50'000
Same pc, but with a servothread only gives
Above results repeatedly achieved several times. Why is it that latency on serothread is appr. 1.5 - 2x the value of a run with a base thread?
greez
chris
LinuxCNC pc tests, version 20200624, started 25.06.2020 03:10:35
********************************************************************************
General info:
Hewlett-Packard, HP Compaq Elite 8300 SFF
Bios version K01 v02.90, dated 07/16/2013
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) i5-3570 CPU @ 3.40GHz
cpu cores : 4
stepping : 9
cache size : 6144 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Size: No Module Installed
Size: 4096 MB
Size: No Module Installed
Size: 4096 MB
================================================================================
GPU related data:
product: Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Desktop: KDE, Session:
================================================================================
Kernel related data:
Kernel 4.19.0-9-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1,2,3"
Cpu idle driver: none
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, good!
Yes, may cause bigger latency.
Check if snd modules are loaded: snd_hda_codec_hdmi 57344 1
snd_hda_codec_realtek 122880 1
snd_hda_codec_generic 86016 1 snd_hda_codec_realtek
snd_hda_intel 49152 4
snd_hda_codec 151552 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
snd_hda_core 98304 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 114688 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_core
snd_timer 36864 1 snd_pcm
snd 102400 16 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_pcm
soundcore 16384 1 snd
Yes, may cause bigger latency.
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Logitech USB Receiver
Mice attached to USB:
Logitech, Inc. Cordless Mouse Receiver
Keyboards attached to USB:
MosArt Semiconductor Corp. Defender Office Keyboard (K7310) S Zodiak KM-9010
LinuxCNC related data:
LinuxCNC version is: 2.9.0~pre0.2245.g09397b8d3
================================================================================
Preparing for latency test:
Started glxgears No. 1
Started glxgears No. 2
Started glxgears No. 3
Started glxgears No. 4
Started glxgears No. 5
..........
Started firefox with 'https://vimeo.com/150574260'
================================================================================
Command for latency test is:
su ck -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee 1593047417.lat &"
Latency testing loop started Do Jun 25 03:10:49 CEST 2020,
should end after Do Jun 25 05:10:49 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7200 secs servo min: -39.000 uS max: 30.900 uS sdev: 3.400 uS
7201 secs base min: -31.500 uS max: 34.000 uS sdev: 0.600 uS
Same pc, but with a servothread only gives
... (hw summary see above)
================================================================================
Command for latency test is:
su ck -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee 1593024764.lat &"
Latency testing loop started Mi Jun 24 20:53:09 CEST 2020,
should end after Mi Jun 24 22:53:09 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7202 secs servo min: -63.400 uS max: 60.500 uS sdev: 3.800 uS
7203 secs servo min: -63.400 uS max: 60.500 uS sdev: 3.800 uS
Above results repeatedly achieved several times. Why is it that latency on serothread is appr. 1.5 - 2x the value of a run with a base thread?
greez
chris
Last edit: 18 Sep 2020 06:34 by seuchato. Reason: typo
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25 Jun 2020 08:59 #172695
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Same hp 8300 sff, but with kernel 4.9.0-12-rt-amd64, basthread again at 25⁰000
lookee lookee: no rt delays!
greez
chris
================================================================================
Kernel related data:
Kernel 4.9.0-12-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll isolcpus=1,2,3"
Cpu idle driver: none
================================================================================
...
================================================================================
Command for latency test is:
su ck -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1593058060.lat &"
Latency testing loop started Do Jun 25 06:07:55 CEST 2020,
should end after Do Jun 25 08:07:55 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7205 secs base min: -18.000 uS max: 18.700 uS sdev: 0.500 uS
7205 secs servo min: -47.200 uS max: 44.900 uS sdev: 0.900 uS
lookee lookee: no rt delays!
greez
chris
The following user(s) said Thank You: tommylight, johnmc1
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25 Jun 2020 14:54 #172735
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Still the same hp 8300 sff, same kernel, but this time w/o isolcpus. Got a realtime delay after 15 - 30 seconds, so the run below is for basthread interval 50'000 us
next, a run without base thread
Again: servo thread w/o base thread gets 1.5 to 2x the time as with base thread. I really wonder why?
Prel. conclusions:
isolcpus does not do too much on this machine
kernel matters
need to check preventing of loading of sound modules. (Unfortunately bios does not allow to disable audio)
looks like some useable pc, given it is gen 3 core cpu based, will probably be a good starting point for quite some time
greez
chris
Hewlett-Packard, HP Compaq Elite 8300 SFF
Bios version K01 v02.90, dated 07/16/2013
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) i5-3570 CPU @ 3.40GHz
cpu cores : 4
stepping : 9
cache size : 6144 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Size: No Module Installed
Size: 4096 MB
Size: No Module Installed
Size: 4096 MB
================================================================================
GPU related data:
product: Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller
configuration: driver=i915 latency=0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Desktop: KDE, Session:
================================================================================
Kernel related data:
Kernel 4.19.0-9-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=0 processor.max_cstate=1 idle=poll"
Cpu idle driver: none
================================================================================
...
Command for latency test is:
su ck -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee 1593077144.lat &"
Latency testing loop started Do Jun 25 11:26:10 CEST 2020,
should end after Do Jun 25 13:26:10 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7201 secs base min: -28.700 uS max: 26.900 uS sdev: 0.700 uS
7201 secs servo min: -37.800 uS max: 39.900 uS sdev: 1.100 uS
next, a run without base thread
================================================================================
Command for latency test is:
su ck -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee 1593088904.lat &"
Latency testing loop started Do Jun 25 14:42:08 CEST 2020,
should end after Do Jun 25 16:42:08 CEST 2020
Swap useage: prerun: 0, running: 0
================================================================================
last latency data is as follows:.
7200 secs servo min: -72.800 uS max: 68.900 uS sdev: 3.100 uS
7201 secs servo min: -72.800 uS max: 68.900 uS sdev: 3.100 uS
Again: servo thread w/o base thread gets 1.5 to 2x the time as with base thread. I really wonder why?
Prel. conclusions:
greez
chris
The following user(s) said Thank You: tommylight, johnmc1
Please Log in or Create an account to join the conversation.
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