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

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26 Jun 2020 10:57 #172788 by seuchato
Results of an old ASUS AT5MNI board: Got unexpected realtime delays even with base thread interval at 100'000! also the passive cooler on the board got very hot. So I guess, not useable at all.
LinuxCNC pc tests, version 20200624, started 25.06.2020 17:31:11
********************************************************************************
General info:
ASUSTeK Computer INC.,  System Product Name
Bios version 0214, dated 12/01/2009
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name      : Intel(R) Atom(TM) CPU D510   @ 1.66GHz
cpu cores       : 2
stepping        : 10
cache size      : 512 KB
================================================================================
RAM related data:
Maximum Capacity: 4 GB
Size: 1024 MB
Size: 1024 MB
================================================================================
GPU related data:
product: Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller
product: Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller
configuration: driver=i915 latency=0
configuration: latency=0
================================================================================
Os related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Desktop: KDE, Session: 
================================================================================
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"
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: No, good!
Yes, may cause bigger latency.
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : USB-compliant keyboard
Mouse 1 : 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~pre0.2258.gc90c1926d
================================================================================
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 100000 --sbinsize 1000 --nox 2>&1 | tee  1593099059.lat &"

Latency testing loop started Do Jun 25 17:31:32 CEST 2020, 
should end after Do Jun 25 19:31:32 CEST 2020

Unexpected realtime delay on task 0 with period 100000
should end after Do Jun 25 19:31:32 CEST 2020

Swap useage: prerun: 0, running: 0

================================================================================
last latency data is as follows:.
   15 secs   base min: -93.700 uS max: 121.000 uS sdev:   3.500 uS
   15 secs  servo min: -57.200 uS max:  59.600 uS sdev:   4.300 uS

Greez
chris

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26 Jun 2020 11:16 #172792 by tommylight
That might still be usable for running a Mesa board, be it PCI or PCI-E or Eth.
LinuxCNC does not stress the PC as much as latency histogram does, so there will be less heat, but at the risk of having a bit worse latency than the histogram showed. Still usable, as it seems from the results.

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26 Jun 2020 14:42 #172801 by seuchato
If, I would add a fan. The board has but one pci slot available. So it would be either pci or through an additional Nic eth. hang on to next post :-)

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26 Jun 2020 14:48 - 26 Jun 2020 17:00 #172802 by seuchato
This a test for a Fujitsu esprimo 920. There are no expansion slots that would allow for an LPT to be added. So there is only a serve thread. The machine has a ton of bios options available to play. For this run I just switched off everything that seemed suspicious to impair latency. The system felt really responsive, the most responsive I've tested so far.

LinuxCNC pc tests, version 20200624, started 26.06.2020 13:15:22
********************************************************************************
General info:
FUJITSU,  ESPRIMO Q920
Bios version V4.6.5.4 R1.37.0 for D3233-A1x, dated 08/06/2015
Chipset: Intel Corporation 8 Series 
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name      : Intel(R) Core(TM) i7-4765T CPU @ 2.00GHz
cpu cores       : 4
stepping        : 3
cache size      : 8192 KB
================================================================================
RAM related data:
Maximum Capacity: 16 GB
Size: 8192 MB
Size: 8192 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="Debian GNU/Linux 10 (buster)"
Desktop: KDE, Session: 
================================================================================
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"
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: No, good!
Yes, may cause bigger latency.
================================================================================
Keyboard & Mouse related data:
Number of mice: 2
Mouse 0 : USB-compliant keyboard
Mouse 1 : 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~pre0.2258.gc90c1926d
================================================================================
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 --nobase  --sbinsize 1000 --nox 2>&1 | tee  1593170098.lat &"

Latency testing loop started Fr Jun 26 13:15:35 CEST 2020, 
should end after Fr Jun 26 15:15:35 CEST 2020

Swap useage: prerun: 0, running: 0

================================================================================
last latency data is as follows:.
 7201 secs  servo min: -34.700 uS max:  37.300 uS sdev:   2.800 uS
 7202 secs  servo min: -34.700 uS max:  37.300 uS sdev:   2.800 uS

My (preliminary) conclusion:

  • If possible: get this pc! I'll be surely lurking around.

  • Greez
    chris

    Edit: Dunno, but I'll try the hp 8300 with more ram too, so stand by
    Last edit: 26 Jun 2020 17:00 by seuchato.

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    26 Aug 2020 21:19 - 27 Aug 2020 21:30 #179589 by tommylight
    HP 8300 Ultra Slim :
    LinuxCNC pc tests, version 20200624, started 26.08.2020 22:55:25
    ********************************************************************************
    General info:
    Hewlett-Packard,  HP Compaq Elite 8300 USDT
    Bios version K01 v02.05, dated 05/07/2012
    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) i5-3470S CPU @ 2.90GHz
    cpu cores	: 4
    stepping	: 9
    cache size	: 6144 KB
    ================================================================================
    RAM related data:
    Maximum Capacity: 16 GB
    Size: 4096 MB
    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="Linux Mint 20"
    Desktop: , Session: 
    ================================================================================
    Kernel related data:
    Kernel 4.9.0-13-rt-amd64
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
    Cpu idle driver: intel_idle
    ================================================================================
    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     49152  1
    snd_hda_codec_realtek    90112  1
    snd_hda_codec_generic    73728  1 snd_hda_codec_realtek
    snd_hda_intel          40960  2
    snd_hda_codec         135168  4 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
    snd_hda_core           90112  5 snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
    snd_hwdep              16384  1 snd_hda_codec
    snd_pcm               114688  4 snd_hda_intel,snd_hda_codec,snd_hda_core,snd_hda_codec_hdmi
    snd_seq_midi           16384  0
    snd_seq_midi_event     16384  1 snd_seq_midi
    snd_rawmidi            32768  1 snd_seq_midi
    snd_seq                65536  2 snd_seq_midi_event,snd_seq_midi
    snd_seq_device         16384  3 snd_seq,snd_rawmidi,snd_seq_midi
    snd_timer              32768  2 snd_seq,snd_pcm
    snd                    81920  15 snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_timer,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_seq_device,snd_hda_codec_realtek,snd_pcm
    soundcore              16384  1 snd
    Yes, may cause bigger latency.
    ================================================================================
    Keyboard & Mouse related data:
    Number of mice: 1
    Mouse 0 : PixArt USB Optical Mouse
    Mice  attached to USB:
    Keyboards attached to USB:
    Cherry GmbH G83 (RS 6000) Keyboard
    LinuxCNC related data:
    LinuxCNC version is: 2.9.0~pre0.2662.g3039a67a6
    ================================================================================
    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 cnc -c  "latency-histogram --nobase  --sbinsize 1000 --nox 2>&1 | tee  1598475314.lat &"
    
    Latency testing loop started Wed 26 Aug 2020 10:55:40 PM CEST, 
    should end after Wed 26 Aug 2020 11:07:40 PM CEST
    
    Swap useage: prerun: 0, running: 0
    
    ================================================================================
    last latency data is as follows:.
      720 secs  servo min: -93.100 uS max: 105.700 uS sdev:   9.600 uS
      720 secs  servo min: -93.100 uS max: 105.700 uS sdev:   9.600 uS
    The test was running for 20 minutes while i was watching other stuff on youtube at full HD video quality.
    Not shabby at all ! Thanks to PCW who mentioned this as a very nice LinuxCNC PC.
    Beware of the power brick, quad cores come with 180W power supply that is big and heavy ! :)
    Last edit: 27 Aug 2020 21:30 by tommylight. Reason: typo
    The following user(s) said Thank You: seuchato

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    26 Aug 2020 21:30 #179595 by seuchato
    Just one little thing: There is a hp 830 Elitebook. I guess you do not want your 8300 USDT to be held for the Elitebook?

    greez
    chris
    The following user(s) said Thank You: tommylight

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    26 Aug 2020 23:07 #179602 by aparecido
    1598479016.HW
    LinuxCNC pc tests, version 20200624, started 26.08.2020 18:56:58
    ********************************************************************************
    General info:
    Itautec S.A., Infoway
    Bios version 0110, dated 03/02/2009
    Chipset: Harddisk is rotational
    The amount of swap currently used is 16732
    ================================================================================
    CPU related data:
    model name : Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
    cpu cores : 1
    stepping : 10
    cache size : 3072 KB
    ================================================================================
    RAM related data:
    Maximum Memory Module Size: 4096 MB
    Maximum Total Memory Size: 8192 MB
    Maximum Capacity: 16 GB
    Maximum Memory Module Size: 4096 MB
    Maximum Total Memory Size: 8192 MB
    Installed Size: 1024 MB (Single-bank Connection)
    Enabled Size: 1024 MB (Single-bank Connection)
    Installed Size: Not Installed
    Enabled Size: Not Installed
    Size: 1024 MB
    Size: No Module Installed
    ================================================================================
    GPU related data:
    ================================================================================
    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: none
    ================================================================================
    Kernel modules data:
    Check if pcspkr is loaded: No, good!
    Yes, may cause bigger latency.
    Check if snd modules are loaded: No, good!
    Yes, may cause bigger latency.
    ================================================================================
    Keyboard & Mouse related data:
    Number of mice: 1
    Mouse 0 : ImPS/2 Generic Wheel Mouse
    Mice attached to USB:
    Keyboards attached to USB:
    LinuxCNC related data:
    LinuxCNC version is: 2.8.0~pre3.31.gb7c7ab5aa
    ================================================================================
    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 ' vimeo.com/150574260 '

    ================================================================================
    Command for latency test is:
    su aparecido -c "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox 2>&1 | tee 1598479016.lat &"

    Latency testing loop started qua ago 26 18:57:18 -03 2020,
    should end after qua ago 26 20:57:18 -03 2020

    Unexpected realtime delay on task 0 with period 25000
    should end after qua ago 26 20:57:18 -03 2020

    Swap useage: prerun: 16732, running: 27432

    ================================================================================
    last latency data is as follows:.
    23 secs servo min: -39.800 uS max: 52.100 uS sdev: 4.400 uS
    25 secs base min: -24.900 uS max: 74.600 uS sdev: 2.600 uS


    1598479016.lat
    Note: Using POSIX realtime
    Unexpected realtime delay on task 0 with period 25000
    This Message will only display once per session.
    Run the Latency Test and resolve before continuing.
    4 secs base min: -24.800 uS max: 28.300 uS sdev: 2.500 uS
    4 secs servo min: -15.200 uS max: 18.700 uS sdev: 4.800 uS
    5 secs base min: -24.800 uS max: 33.500 uS sdev: 2.400 uS
    5 secs servo min: -17.300 uS max: 19.700 uS sdev: 4.000 uS
    7 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    7 secs servo min: -29.700 uS max: 24.600 uS sdev: 3.900 uS
    8 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    8 secs servo min: -29.700 uS max: 24.600 uS sdev: 3.600 uS
    9 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    9 secs servo min: -29.700 uS max: 24.600 uS sdev: 3.500 uS
    11 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    11 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.400 uS
    13 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    13 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.600 uS
    14 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    14 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.700 uS
    16 secs base min: -24.800 uS max: 46.900 uS sdev: 2.600 uS
    16 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.800 uS
    17 secs base min: -24.800 uS max: 46.900 uS sdev: 2.500 uS
    17 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.700 uS
    19 secs base min: -24.900 uS max: 58.400 uS sdev: 2.500 uS
    19 secs servo min: -39.800 uS max: 52.100 uS sdev: 3.900 uS
    20 secs base min: -24.900 uS max: 58.400 uS sdev: 2.600 uS
    20 secs servo min: -39.800 uS max: 52.100 uS sdev: 4.200 uS
    22 secs base min: -24.900 uS max: 58.400 uS sdev: 2.600 uS
    22 secs servo min: -39.800 uS max: 52.100 uS sdev: 4.300 uS
    23 secs base min: -24.900 uS max: 74.600 uS sdev: 2.600 uS
    23 secs servo min: -39.800 uS max: 52.100 uS sdev: 4.400 uS
    25 secs base min: -24.900 uS max: 74.600 uS sdev: 2.600 uS

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    27 Aug 2020 11:43 #179679 by seuchato
    aparecido

    Your machine seems to work on swap: "Swap useage: prerun: 16732, running: 27432" Add ram! Add 2 ram bars of same size. I would not go under 4GiB.

    Greez
    chris
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    27 Aug 2020 18:43 - 27 Aug 2020 19:12 #179717 by shortcircuit48
    I am way out of my depth but have got confused. I am running test at moment and these are the results I am getting
    Max Interval & Max Jitter
    Servo 1ms , -- 10,571,476 , & 9,571,476
    Base 25 , --- 30,648,909 , & 30,623,909
    Do these make sense?

    Edit
    Having now read the topic on latency it would appear this machine is not suitable? When I first ran the test it was about 20,000 and I thought ok as it compared with the list of machines that are ok. Having set up the Ethernet to be onboard could that have upset the apple cart?
    Last edit: 27 Aug 2020 19:12 by shortcircuit48.

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    27 Aug 2020 19:38 #179728 by Bari
    More info required. What model and type of PC/laptop is this?

    What do you mean by "Having set up the Ethernet to be onboard"? Please elaborate.

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