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

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6 years 1 month ago #183896 by txtrone
What are the key parameters to discern usable vs unusable when running this test?

What does this line tell me?

7200 secs servo min:-223.200 uS max: 212.400 uS sdev: 12.100 uS

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6 years 1 month ago #183951 by tommylight
It tells that it might still be usable for ethernet Mesa cards, but that can only be confirmed by actually using it for longer periods of time.
It still might have latency excursions over that value when in use as laptops have way to many power saving stuff crammed in.

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6 years 1 month ago #184003 by txtrone
Same Lenovo E430 running Buster.
Code:
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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6 years 1 month ago #184021 by txtrone
Same Lenovo E430, but I replaced the 7200rpm HDD with a SanDisk SSD
Code:
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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6 years 1 month ago #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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6 years 1 month ago #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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