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

LinuxCNC pc tests, version 20200922, started 29.09.2020 12:19:14 ******************************************************************************** General info: Dell Inc., OptiPlex FX160 Bios version A13, dated 01/19/2012 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 330 @ 1.60GHz cpu cores : 2 stepping : 2 cache size : 512 KB ================================================================================ RAM related data: Maximum Capacity: 4 GB Size: 2048 MB Size: 2048 MB ================================================================================ GPU related data: product: 771/671 PCIE VGA Display Adapter configuration: latency=0 ================================================================================ Parallel port related data: number of parallel ports is 0 ================================================================================ Os related data: PRETTY_NAME="Debian GNU/Linux 10 (buster)" Windowmanager = Xfwm4 ================================================================================ Kernel related data: Kernel 4.9.0-12-rt-amd64 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" Cpu idle driver: intel_idle ================================================================================ Kernel modules data: Check if pcspkr is loaded: No, which is good! Check if snd modules are loaded: No, which is good! ================================================================================ Keyboard & Mouse related data: Number of mice: 2 Mouse 0 : Logitech USB Receiver Mouse 1 : Logitech USB Receiver Mice attached to USB: Logitech, Inc. Cordless Mouse Receiver Logitech, Inc. Cordless Mouse+Keyboard Receiver Keyboards attached to USB: Logitech, Inc. Cordless Mouse+Keyboard Receiver ================================================================================ 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 ck -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee -a 1601374738.lat &" Latency testing loop started Di Sep 29 12:19:46 CEST 2020, should end after Di Sep 29 14:19:46 CEST 2020 ================================================================================ Swap useage: prerun: 0, running: 0 ================================================================================ CPU core temperatures: Core 0: Tmin: 57.0°C, Tmax: 68.0°C, (crit = +125.0°C) Core 1: Tmin: 59.0°C, Tmax: 69.0°C, (crit = +125.0°C) ================================================================================ last latency data is as follows:. 7202 secs servo min:-396.400 uS max: 400.800 uS sdev: 16.100 uS 7203 secs servo min:-396.400 uS max: 400.800 uS sdev: 16.100 uS

LinuxCNC pc tests, version 20200930, started 29.09.2020 21:43:31 ******************************************************************************** General info: LENOVO, 20EGS01900 Bios version GNET79WW (2.27 ), dated 03/16/2016 Chipset: Intel Corporation 8 Series/C220 Series Harddisk is non-rotational, ie. SSD The amount of swap currently used is 0 ================================================================================ CPU related data: model name : Intel(R) Core(TM) i7-4810MQ CPU @ 2.80GHz cpu cores : 4 stepping : 3 cache size : 6144 KB ================================================================================ RAM related data: Maximum Capacity: 32 GB Size: 8192 MB Size: No Module Installed Size: No Module Installed Size: 8192 MB ================================================================================ GPU related data: product: GK106GLM [Quadro K2100M] product: 4th Gen Core Processor Integrated Graphics Controller configuration: driver=nouveau latency=0 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 = Xfwm4 ================================================================================ Kernel related data: Kernel 4.9.0-12-rt-amd64 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" Cpu idle driver: intel_idle ================================================================================ 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, alternatively, you can run "./block-snd-modules" which has just now been created for your convenience. ================================================================================ Keyboard & Mouse related data: Number of mice: 3 Mouse 0 : SynPS/2 Synaptics TouchPad Mouse 1 : TPPS/2 IBM TrackPoint Mouse 2 : Logitech USB Receiver Mice attached to USB: Keyboards attached to USB: Holtek Semiconductor, Inc. Keyboard ================================================================================ 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 27263329 ================================================================================ Command for latency test is: su ck -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee -a 1601408609.lat &" Latency testing loop started Di Sep 29 21:43:45 CEST 2020, should end after Di Sep 29 23:43:45 CEST 2020 ================================================================================ Swap useage: prerun: 0, running: 0 ================================================================================ CPU core temperatures: Core 0: Tmin: 55.0°C, Tmax: 89.0°C, (high = +84.0°C, crit = +100.0°C) Core 1: Tmin: 53.0°C, Tmax: 86.0°C, (high = +84.0°C, crit = +100.0°C) Core 2: Tmin: 54.0°C, Tmax: 85.0°C, (high = +84.0°C, crit = +100.0°C) Core 3: Tmin: 49.0°C, Tmax: 83.0°C, (high = +84.0°C, crit = +100.0°C) ================================================================================ last latency data is as follows:. 7199 secs servo min: -56.000 uS max: 54.500 uS sdev: 4.300 uS 7200 secs servo min: -56.000 uS max: 54.500 uS sdev: 4.300 uS

... ================================================================================ Parallel port related data: number of parallel ports is 1 parport0: PC-style at 0x3000 (0x3008), irq 18 [PCSPP,TRISTATE,EPP] ================================================================================ ...

grep -Ei "4\.19|4\.9|4\.14|secs" *.hw 1601429748.hw:Kernel 4.9.0-12-rt-amd64 1601429748.hw: 1815 secs base min: -44.100 uS max: 54.500 uS sdev: 1.400 uS 1601429748.hw: 1815 secs servo min: -43.400 uS max: 38.800 uS sdev: 2.300 uS 1601433289.hw:Kernel 4.14.174-rtai-amd64 1601433289.hw: 7202 secs base min: -49.900 uS max:11963.200 uS sdev: 42.700 uS 1601433289.hw: 7202 secs servo min:-999.900 uS max:11374.800 uS sdev: 10.900 uS

Dell Inc., OptiPlex 980 Windowmanager = Xfwm4 Kernel 4.14.174-rtai-amd64 7204 secs base min: -34.900 uS max:19005.400 uS sdev: 34.300 uS 7204 secs servo min:-1014.900 uS max:9272.000 uS sdev: 31.500 uS

LinuxCNC pc tests, version 20200930, started 01.10.2020 17:42:30 ******************************************************************************** General info: Dell Inc., OptiPlex 980 Bios version A05, dated 11/03/2010 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) i7 CPU 870 @ 2.93GHz cpu cores : 4 stepping : 5 cache size : 8192 KB ================================================================================ RAM related data: Maximum Capacity: 16 GB Size: 2048 MB Size: 2048 MB Size: 2048 MB Size: 2048 MB ================================================================================ GPU related data: product: RV710 [Radeon HD 4550] configuration: driver=radeon latency=0 ================================================================================ Parallel port related data: number of parallel ports is 1 parport0: PC-style at 0x378 (0x778), irq 7 [PCSPP,TRISTATE,EPP] ================================================================================ Os and desktop related data: PRETTY_NAME="Debian GNU/Linux 10 (buster)" Should the info below not match with your machine, kindly post the output of pstree here, including a brief desciption of your desktop environment, window manager and display manager. Tia https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency Desktop environment : kdeconnectd Windowmanager : KWin Displaymanager : sddm ================================================================================ Kernel related data: Kernel 4.19.0-11-rt-amd64 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=3" Cpu idle driver: intel_idle ================================================================================ Kernel modules data: Check if pcspkr is loaded: No, which is good! Check if snd modules are loaded: No, which is good! ================================================================================ Keyboard & Mouse related data: Number of mice: 1 Mouse 0 : Logitech MX Anywhere 2 Mice attached to USB: Keyboards attached to USB: Dell Computer Corp. Dell QuietKey Keyboard ================================================================================ 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 54526119 ================================================================================ Command for latency test is: su ck -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee -a 1601566940.lat &" Latency testing loop started Do Okt 1 17:42:45 CEST 2020, should end after Do Okt 1 19:42:45 CEST 2020 ================================================================================ Swap useage: prerun: 0, running: 0 ================================================================================ CPU core temperatures: Core 0: Tmin: 39.0°C, Tmax: 71.0°C, (high = +83.0°C, crit = +99.0°C) Core 1: Tmin: 35.0°C, Tmax: 68.0°C, (high = +83.0°C, crit = +99.0°C) Core 2: Tmin: 36.0°C, Tmax: 67.0°C, (high = +83.0°C, crit = +99.0°C) Core 3: Tmin: 34.0°C, Tmax: 69.0°C, (high = +83.0°C, crit = +99.0°C) ================================================================================ last latency data is as follows:. 7204 secs base min: -16.100 uS max: 16.000 uS sdev: 3.200 uS 7204 secs servo min: -11.900 uS max: 11.700 uS sdev: 0.300 uS

... ================================================================================ GPU related data: product: RV620 LE [Radeon HD 3450] configuration: driver=radeon latency=0 ================================================================================ ... >>>Unexpected realtime delay on task 0 with period 50000<<< ================================================================================ Swap useage: prerun: 0, running: 0 ================================================================================ CPU core temperatures: Core 0: Tmin: 40.0°C, Tmax: 53.0°C, (high = +83.0°C, crit = +99.0°C) Core 1: Tmin: 36.0°C, Tmax: 51.0°C, (high = +83.0°C, crit = +99.0°C) Core 2: Tmin: 36.0°C, Tmax: 50.0°C, (high = +83.0°C, crit = +99.0°C) Core 3: Tmin: 35.0°C, Tmax: 52.0°C, (high = +83.0°C, crit = +99.0°C) ================================================================================ last latency data is as follows:. 52 secs base min: -44.800 uS max: 45.800 uS sdev: 0.300 uS 52 secs servo min: -3.500 uS max: 4.100 uS sdev: 0.100 uS

product: RV710 [Radeon HD 4550] (left here just for reference) "latency-histogram --bbinsize 1000 --base 25000 --sbinsize 1000 --nox" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=3" 7204 secs base min: -16.100 uS max: 16.000 uS sdev: 3.200 uS 7204 secs servo min: -11.900 uS max: 11.700 uS sdev: 0.300 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=3" 7202 secs base min: -7.100 uS max: 17.300 uS sdev: 2.500 uS 7202 secs servo min: -8.500 uS max: 8.600 uS sdev: 0.100 uS >this one looks very good:< GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1,2,3" 7200 secs servo min: -7.800 uS max: 7.900 uS sdev: 0.300 uS 7201 secs base min: -7.100 uS max: 13.000 uS sdev: 1.200 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0" 25 secs base min: -20.800 uS max: 23.700 uS sdev: 1.500 uS 25 secs servo min: -17.800 uS max: 17.500 uS sdev: 1.700 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0,1" 51 secs base min: -24.500 uS max: 19.700 uS sdev: 2.400 uS 51 secs servo min: -23.100 uS max: 22.800 uS sdev: 10.300 uS >this one looks very good, too:< GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0,1,3" 7203 secs base min: -7.100 uS max: 12.400 uS sdev: 1.400 uS 7203 secs servo min: -8.000 uS max: 8.200 uS sdev: 0.200 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=0,1,2" 20 secs base min: -21.400 uS max: 33.000 uS sdev: 2.100 uS 20 secs servo min: -16.000 uS max: 15.700 uS sdev: 2.100 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=1,2,3" 7202 secs base min: -7.100 uS max: 12.800 uS sdev: 1.500 uS 7202 secs servo min: -12.800 uS max: 12.500 uS sdev: 0.200 uS GRUB_CMDLINE_LINUX_DEFAULT="quiet splash isolcpus=2,3" 7200 secs base min: -7.100 uS max: 17.900 uS sdev: 1.900 uS 7200 secs servo min: -10.600 uS max: 11.000 uS sdev: 0.200 uS

7204 secs base min: -16.100 uS max: 16.000 uS sdev: 3.200 uS 7204 secs servo min: -11.900 uS max: 11.700 uS sdev: 0.300 uS

7203 secs base min: -7.100 uS max: 12.400 uS sdev: 1.400 uS 7203 secs servo min: -8.000 uS max: 8.200 uS sdev: 0.200 uS

lspci | grep -i ether 00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I217-V (rev 04)