Let the test run for at least 15 minutes (it has been suggested that the longer the better let it run for a day or overnight for instance) while you run glxgears or a similar application to stress the cpu. Move around windows, surf the web, copy files, play music etc.
If you have a multi-cpu machine, it is helpful to report results with the isolcpus boot parameter set appropriately (see elsewhere in this wiki).
Note that the numbers reported in this test are extremely precise but not necessarily extremely reproducible. Results may vary by 1000 ns from one invocation to another (e.g., by a few microseconds).
If you want to add information to this page or add a new page, follow some BasicSteps.
So, what do the results mean? If your "Max Jitter" number is less than about 15-20 microseconds (15000-20000 nanoseconds), the computer should give very nice results with software stepping. If the Max Jitter is more like 30-50 microseconds, you can still get good results, but your maximum step rate might be a little disappointing, especially if you use microstepping or have very fine pitch leadscrews. If the numbers are 100 uS or more (100,000 nanoseconds), then the PC is not a good candidate for software stepping. Numbers over 1 millisecond (1,000,000 nanoseconds) mean the PC is not a good candidate for LinuxCNC, regardless of whether you use software stepping or not.
What can be done about improving latency? See these pages:
FixingSMIIssues
TroubleShooting
If you are going to use software stepping, then read this:
TweakingSoftwareStepGeneration
Motherboard | CPU | Other hardware comments | Max Interval (1.0 ms thread) | Max Jitter(ns) 1.0 ms thread | Max Interval (25 us thread) | Max Jitter (25 us thread) | Realtime flavour |
Gigabyte A320M-S2H AM4 | AMD 7th Gen A8-9600 APU | 4GB Ram, onboard display, 500gb SSD, LiveCD? linuxcnc-2.7-wheezy.iso, "isolcpus=2,3", with "cpu hog" running, 2 GLXGEARS, disabled= Core performacnce boost, turbo performance boost, cool& quite, SVM Mode, C6 Mode | 1022205 | 9997 | 31798 | 7110 | 3.4.9-rtai-686-pae |
ABIT KT7A-RAID | AMD Athlon Thunderbird 1200+ (1.2GHz) | ATI 3D Rage IIC AGP Card. Disable RAID in BIOS. SIIG LPT2 ISA Card. 3COM Fast Etherlink XL PCI. 2x 256MB Kingston RAM (512 MB). Sinlge HDD and CD-ROM. VESA driver. | 1006520 | 10206 | 39454 | 16567 | |
ABIT KT7A-RAID | AMD Athlon Thunderbird 1200+ (1.2GHz) | ATI Radeon RV100 QY (VE/7000) AGP Card. Disable RAID in BIOS. SIIG LPT2 ISA Card. 3COM Fast Etherlink XL PCI. 2x 256MB Kingston RAM (512 MB). Sinlge HDD and CD-ROM. VESA driver. | 1006741 | 10815 | 40234 | 17746 | |
Acer 5900pro PC | Intel P4 1.8GHz dual core | 4GB RAM, Ubuntu 10.04 LTS, EIST off, C1E off, Spread Spectrum off, Disable Audio and network support, On-board video, Running GLXGEARS and reading PDFs | 1001347 | 5347 | 29795 | 5001 | |
Acer M3970G | Intel i5-2320 @ 3.0 GHz | 4GB Ram, Radeon HD 7350, Seagate Barracuda 1TB 7200rpm, Ubuntu 12.04.4 LTS, GRUB 1.99-21ubuntu3.14, "isolcpus=1,2,3", with "cpu hog" running, 3 GLXGEARS, surfing web, listening to music, system monitor running, and making this entry. Roughly 2 hour test. Also tested with no CPUs isolated, but running four "cpu hogs". That performed about twice as good as no "cpu hogs", but it performed best as shown here with one CPU maxed out. | 995395 | 1275 | 27350 | 2497 | 3.4.55-rtai-2 |
Advantech PCM-9588 | Celeron @ 1.0 GHz | Intel 910GMLE Video Card, 1g RAM, Mesa 4i65, Award BIOS | 1004842 | 8337 | 36363 | 12058 | |
ASRock K10N78FullHD-hSLI R3.0 | Athlon 64 X2 6000+ and NVidia 9800GTX+ | 4GB Ram + Booted from 8.04 LiveCD + 10*Glxgears + 1hour | 1005000 | 6811 | 39818 | 15513 | |
ASRock H61M-HVS | Intel Celeron G530 | 4GB Ram, isolcpus=1, C1E/C3/C6 suspend states disabled in BIOS, ATI Radeon 2400HD w/ "radeon" driver. Full details: http://sourceforge.net/mailarchive/forum.php?thread_name=5b3301cccd23%241a33e5e0%244e9bb1a0%24%40d-silva.org&forum_name=emc-users | 992204 | 4364 | 29631 | 4935 | |
ASRock P4i65G | Intel Pentium 4 @ 3.0 Ghz | using onboard video 1 GB RAM | 1007169 | 11193 | 36043 | 11738 | |
ASRock PV530A-ITX | VIA PV530@1.8GHz, 4GB Ram | ATI Radeon 9200 Pro (256 MB) PCI card. Networking OFF. Ubuntu 10.04. Kingston SSD. glxgears running @ 390 fps. Note: Axis choked using on-board video. Measured 33 Watts total power draw by Mini-ITX computer running LinuxCNC | 1001094 | 5934 | 33281 | 9325 | |
ASRock FM2A88M-HD+ | AMD A4-4000 Dual Core 3.2GHZ Max Turbo, 3.0 GHZ Base, | 10.04, All Power saving features disabled in BIOS, Bios updated to VER 2.40, ISOLCPUS Enabled, IRQBalance un-installed, Disabled/Turned? Off spread spectrum, turbo core, APM, C6, cool'n'quiet, SVM, cpu throttle, suspend to RAM | 1011623 | 13758 | 32252 | 7966 | |
ASRock E350M1 mini-itx | AMD Dual-Core Zacate E350/E350D APU 1.6GHz | 12.04, 3.4.55 RTAI, All power management disabled in BIOS, Disabled Spread Spectrum, Turbo Core, APM, C6, Cool'n'quiet, SVM, Cpu Throttle, Suspend to RAM, Kernel options "isolcpus=1 acpi_irq_nobalance noirqbalance", Upstart script "irq-affinity.conf" to /etc/init | 998163 | 5365 | 2714 | 2176 | |
ASRock E350M1 mini-itx | AMD Dual-Core Zacate E350/E350D APU 1.6GHz | 12.04, 3.4.9 RTAI, default BIOS, default kernel options. SSD, 2 GB 667 MHz RAM. Multiple YouTube? videos, glxgears, file operations, etc for approx 20 min | 1005722 | 13553 | 37753 | 13358 | |
ASUS AT5NM10-I | Intel D510 1.66GHz | Ubuntu10.04LTS 2.6.32-122-rtai kernel 2GB RAM, 30GB SATA/SSD, hyperthreading disabled, PS/2 keyboard and mouse, no isolcpus parameter, test ran 15m with 2Xglxgears, web surfing, taking directory listing of external USB HD, playing movie from external HD in VLC | 1005425 | 12225 | 39555 | 15616 | |
ASUS AT5NM10-I | Intel D510 1.66GHz | Ubuntu10.04LTS 2.6.32-122-rtai kernel 2GB RAM, 30GB SATA/SSD, hyperthreading disabled, PS/2 keyboard and mouse, isolcpus=1 parameter, same test as above | - | 6395 | - | 9073 | |
ASUS AT5NM10-I | Intel D510 1.66GHz | Ubuntu10.04LTS 2.6.32-122-rtai kernel 2GB RAM, 30GB SATA/SSD, hyperthreading disabled, no keyboard and mouse, isolcpus=1 parameter, running headless with Gnome and X shut down, same test as above while logged in via ssh -Y from remote computer | 996411 | 3211 | 27885 | 3222 | |
ASUS M4N78-SE | AMD Athlon II X2 250 - 3.0GHz | Asus HDATI 3450 256MB graphics card | 1004855 | 8403 | 38677 | 14372 | |
ASUS P4P800-VM | Intel Pentium 4 - 3.0GHz | Bios A.M. 1014.006, 1GB SDRam, Intel 82865 controller on board video/network/serial/parallel/usb/AC97 sound | 1006527 | 10196 | 35768 | 12023 | |
ASUS P4S800D-X | 2.6GHZ Pentium 4 | GeForce MX4000 AGP | 1005493 | 8988 | 35368 | 12443 | |
ASUS P3C2000 | 600MHZ Pentium III | ATI Rage AGP (might be on the edge) | 1029886 | 33381 | 49221 | 24916 | |
ASUS P5B DELUXE | INTEL PENTIUM D915 2800Mhz | ASUS ATI RADEON EAH2400XT, 1Gb RAM | 1021102 | 24597 | 55135 | 30830 | |
ASUS P5B DELUXE | Core2Duo E6600 2x2.4 GHz | Radeon X300 with 128MB, 4 GB Corsair PC2-800 CL4 RAM, 80GB Samsung IDE HDD, applied tweaks for multicore IRQ remapping (http://www.linuxcnc.org/index.php/german/forum/18-computer/25927-reducing-latency-on-multicore-pcs-success?start=10#36865), tested for 1 hour with 5 glxgears and full HD video playback | 998780 | 3313 | 28048 | 3206 | |
ASUS PC-DL | Dual Xeon 3.06 (HT Off,P4 style) | Nvidia 6600GT with binary driver, on SMP kernel, Note there is a ~40k latency spike when *starting* openGL windows, all results are with GLX gears running, as well as xchat and firefox while installing a bunch of software | 993562 | 6471 | 27011 | 2458 | |
ASUS E35M1-I | AMD Fusion E-350 Dual Core 1.6GHz | 8GB RAM, LinuxCNC liveCD 10.04, BIOS disabled auto over clocking & C6 (aggressive sleep mode), burn in with 4 hour stress test (I'm a programmer) stress -c 16 -i 16 -m 16 -t 14400" | 1001512 | 12009 | 34003 | 9198 | |
Asus M488T-M | AMD Athlon II X4 640 3GHz | 10.04LTS installed from LiveCD, onboard ATI Radeon 4250 video, 4GB RAM, C1E off in bios, 3-hour latency-test run with usual torture tests | 1004378 | 7258 | 29312 | 4384 | |
Asus M488T-M | AMD Athlon II X4 640 3GHz | 10.04LTS installed from LiveCD, onboard ATI Radeon 4250 video, 4GB RAM, C1E off in bios, isolcpus=3, 3-hour latency-test run with usual torture tests | 1001521 | 4401 | 27306 | 2378 | |
Asus M5A78L-MLX Plus | AMD Sempron 2.8Ghz | 10.04LTS, Defaults in BIOS glxgears, Surf web, youtube videos | 1005953 | 8833 | 33097 | 8169 | |
Asus M5A88-M EVO | AMD Athlon II X2 250 3GHz | 10.04LTS, ATI/AMD Radeon XFX HD 5450 512MB C1E off in bios, instances of "gzip -c /dev/urandom > /dev/null" to load up CPUs to 100% | 1002993 | 4513 | 27267 | 2305 | |
Asus M5A88-M EVO | AMD Athlon II X2 250 3GHz | 10.04LTS, onboard Graphics 512MB, C1E off in bios, instances of "gzip -c /dev/urandom > /dev/null" to load up CPUs to 100% | 1003210 | 4730 | 28967 | 4005 | |
Asus A7N8X | AMD Athlon-XP Barton @2.3GHz | Gentoo x86, GeForce2 MX400 nv 2x512MB | 1007436 | 7796 | 33046 | 8055 | |
Asus P5P41D | Intel Core2Duo E7400 2.8GHz | Ubuntu 10.01 Live CD, PNY PCI-E GeForce 7300 256mb | 1010178 | 20111 | 42055 | 22584 | |
Asus P5G41-M LE/CSM | Intel Core2Duo E6550 2.3GHz | Ubuntu 10.04 LTS, 2G DDR2 1066 Ram (2) 1g sticks, Mesa 5i20, onboard Intel GMA X4500 Video, Intel G41 Chipset, Disabled ACPI, everything just worked | 1033641 | 37161 | 41631 | 16719 | |
Biostar M7VIG 400, rev. 7.3 | AMD Athlon XP 2600+ | 512mB RAM, AGP video card running "vesa" driver (STG4000 [3D Prophet Kyro Series] (rev 01)) | 1,006,353 | 9,848 | 39,247 | 15,099 | |
Commell FS-97DXG2 | Intel Core2Duo E6750 2.66Ghz | PICMG CPU card, backplane = 14xISA 4xPCI, 2x1GB DDR2 800 (dual channel), 8GB 266x CF via SATA->CF (DMA active), LVDS+VGA via Intel G35 (onboard), C1E OFF, APIC 1.4 ON, PWR SAV @ MIN, Mesa 5i20, 10.04 LTS with 2.5.4, ISOLCPUS=1, 14 hour run of glxgears x6, "gzip -c /dev/urandom > /dev/null" (thanks for idea), pdfs, firefox video, DVD playing via USB etc. Pleasing numbers, I thought. | 1000048 | 3998 | 29405 | 4493 | |
Compaq Deskpro EN | 1GHZ Pentium III | Onboard video - Di/sable power saving in bios - Nice machine | 1011400 | 14895 | 35748 | 11876 | |
Dell D600 w/SMI fix, Dapper | 1.7GHz | Firefox, Ooo 3.0, Boot with wireless PCMCIA card seems to give immediate unacceptable results (>1.8ms), requires more checking - should check latency-test after boot | 1010992 | 14770 | 43575 | 19270 | |
Dell Dimension 2400 Intel 845GV chipset BIOS ver.A05 | 2.66GHz Pentium 4 512KB cache | 1GB RAM - Integrated Intel 3D Extreme Graphics | 1006298 | 9905 | 35597 | 11875 | |
Dell Dimension 3100 | 3GHz P4 | Intel 915G chipset, BIOS ver.A04, 512MB, Only 2 PCI slots No Built in Serial or Parallel Ports!!! Onboard video - must disable SMI | 1009636 | 13135 | 41260 | 19167 | |
Dell Dimension XPS T450 Intel 440BX AGPset BIOS ver.A04 | 450MHz Pentium III 512KB cache | 384MB RAM ATI Rage 128 AGP | 1020462 | 25170 | 40680 | 16375 | |
Dell Dimension 4100 | Intel 866 PIII | Intel 815 chipset, nVidea NV34 GeForce FX5200 AGP 128mb video(upgrade), Admtek NC100 10/100 network, 512Mb PC133 ram, legacy usb=disabled and PNP OS=YES, COM1=enabled, LPT=Bidirectional in bios | 1010073 | 13863 | 37657 | 13352 | |
Dell Inspiron 530S | Intel(R) Celeron(R) CPU 450 @ 2.20GHz | open glxgears two dozen times and rescaled a small image to 10000 its size | 1009695 | 13833 | 38635 | 14386 | |
Dell Inspiron 3000 | INTEL N3530 Pentium CPU 2.17 GHz | 4GB RAM, Running LinuxCNC 2.6 from live USB. Using integrated GPU, No parport - Not suitable at all | 1281160 | 290360 | 322030 | 297260 | |
Dell Inspiron 8500 | Intel Pentium Mobile 2GHz | FixingSMIIssues | 1006175 | 12080 | 36855 | 12735 | |
Dell Optiplex GX270 | 2.8GHZ Pentium 4 | Onboard video - must disable SMI | 1006360 | 9952 | 35976 | 11689 | |
Dell Optiplex 360 | E7200 @ 2.53 GHz | Intel G31 onboard Video. SMP Kernel | 1010913 | 16443 | 39908 | 14966 | |
Dell Optiplex 380 | E8400 @ 3 GHz | Intel 4 series onboard Video. SMP Kernel. kernel options: isolcpus=1 lapic quiet rootdelay=5 intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll. Ran irq-affinity.conf as a root script. 12 Hours 6*glxgears, youtube video stream, Xfci screensaver Off (no sleep), Bios: Dell A07[latest],Audio disabled,fronside USB disabled,Virtualizaion support off, dual core enabled | 1007529 | 8999 | 37069 | 12092 | |
Dell Optiplex GX240 | 1.8GHZ Pentium 4 | Ati Rage AGP must disable SMI Caveat:- later versions used the 82801BA_12 chipset which is not one of the ones causing SMI problems. Check the chipset by running lspci -vv and run latency tests before automatically trying to load the rtai_smi module | 1010203 | 13698 | 38875 | 14714 | |
Dell Optiplex GX150 | P3 1GHz | remote access, NOT using onboard video | 1004741 | 8236 | 39224 | 14919 | |
Dell Optiplex 745 | Intel Core2 Duo 6300 1.86GHz | 3GB RAM, onboard Intel graphics, no bios adjustments or cpu isolation, 1-hour latency-test run from LiveCD?, usual torture tests | 163063 | 63823 | 49578 | 24597 | |
Dell D600 | 1.6GHz + ATI Mobility | 2GB Ram; Ubuntu 8.04 installed from LiveCD + SMI Fix + 10*Glxgears + 1hour | 1703642 | 707137 | 103020 | 78715 | |
Dell D600 | 1.6GHz + ATI Mobility | 2GB Ram; Ubuntu 8.04 installed from LiveCD + without SMI fix + 10*Glxgears -> unusable | 37066563 | 36070058 | 36060747 | 36036442 | |
Dell Optiplex 745 SFF | Dual Core 2.13 Ghz | 2 GB Ram, 10.04 Live CD (8.04 gave blank screen) | 1064158 | 64918 | 49610 | 24629 | |
Dell Precision 390 | Dual Core 1.86 E6300 | Debian Wheezy, 2 GB Ram, ATI RV530, 160GB SATA, isolcpus 1, All BIOS power savings disabled, on board audio disabled, running 20x HD Mpeg videos, applying cubism filter to 6400 X 4000 image in GIMP | 1165971 | 167411 | 169888 | 144924 | |
ECS KM400-M2 (V1.0) | Sempron 2200 | On-board Video | 1,005,717 | 9,460 | 33,956 | 9,930 | |
ECS Goal3 | AMD Athlon 64 3200+ | Ati radeon HD 4650 pci-e video card - on board video seems to work OK for latency but has issue with on screen 'noise' at higher res/color depths | 1001253 | 5044 | 29867 | 6203 | |
eMachines ET1331-45 | Athalon II X2 255 dual core - 64 bit (3.1GHz) | Asus GeoForce 210 1GB DDR3 (EN210SILENTDI3) video (proprietary driver "current") + PC 3GB DDR2 RAM + PCI parport Manhattan 158220 - 20 hr test max spike numbers 30% more than typical for all numbers. Spike coincides w/ maximizing flash video window in Firefox. Anything else keeps lower numbers. Before installing video card (using on board video), typical numbers were similar, but with spikes ~2X current max numbers. | 1008590 | 14710 | 36912 | 13582 | |
Fujitsu-Siemens Green PC | Pentium 4 2.4 GHz | Low profile desktop with mini ATX board and Intel 82801EB/ER (ICH5/ICH5R) chipset & 82865G graphics. Running 8.04 with stock 2.6.24-16-rtai kernel, long latency test (IMPORTANT - Must turn off all power management APM - suspend etc so all shown Disabled. Also set fan to Enhanced - on all the time so no temp sensing- otherwise will have 64 sec spikes like smi, but smi module will not work with this chipset) | 1003341 | 6836 | 33958 | 9653 | |
Fujitsu-Siemens ESPRIMO P5905 (i945G) | Pentium 4 3.0 GHz | Debian Wheezy, 2 GB RAM, Mainboard D2151 μATX, onboard GPU, Mesa 5i25 (Sound, LAN, PWM, DVD, Floppy, Card reader, Frontpanel & unused Ports disabled) | 1003780 | 6100 | 33063 | 8241 | |
Gigabyte F2A85X-UP4 | AMD A8 5600K 3.9GHz Quad Core | Gentoo 3.4.55 RTAI, 8GB RAM with PAE, All power management disabled in BIOS, Disabled Spread Spectrum, Turbo Core, APM, C6, Cool'n'quiet, SVM, Cpu Throttle, Suspend to RAM | 999004 | 4978 | 29532 | 4981 | |
Gigabyte GA-MA785GM-UD2H | Athlon Dual Core 4850e and onboard graphic | 6GB Ram + Booted from 8.04 LiveCD + 10*Glxgears + 1hour | 1005612 | 9141 | 34062 | 9757 | |
Gigabyte GA-MA785GSM-US2H | Phenom II X4 920 2.8GHz | Onboard graphics, 8GB Ram, 10.04, 2.6.32 RTAI, All power management disabled in BIOS, Kernel options "isolcpus=1 acpi_irq_nobalance noirqbalance", Upstart script "irq-affinity.conf" to /etc/init | 1000452 | 5492 | 31920 | 7046 | |
Gigabyte GA-P35-S3G | E4600 Core Duo- 2.4GHz | XFX GeForce 8400GS 256mb graphics card | 1002443 | 5982 | 34275 | 9970 | |
Gigabyte GA-P35-S3G | E4600 Core Duo- 2.4GHz | Asus GeForce 8600GT 512mb graphics card | 1006082 | 9577 | 34775 | 10580 | |
Gigabyte GA-E350N mini-ITX | AMD E-350D/A45/rev3.0 Dual 1.6 GHz | 3.2 GB RAM, Integrated AMD HD 6310 graphics with 384 MB, AMD Catalyst Version 10.12., Ubuntu 10.04, 2.6.32-122-rtai kernel, isolcpus=1, 1 hour test | 995422 | 7468 | 29337 | 4869 | |
Gigabyte GA-E350N v3.0 mini-ITX | AMD E-350D/A45 Dual 1.6 Ghz | 4 GB Kingston KHX1600C9D3K2/4GX RAM, 64GB OCZ Agility SSD, applied tweaks for multicore IRQ remapping, tested for 24 hours with 2 glxgears and flash/text firefox browser running | 992803 | 4603 | 28321 | 3669 | |
Gigabyte GA-D525TUD mini-ITX | Atom D525 1.8Ghz | 2 GB RAM, BIOS:CPU MULTI=DISABLED CPU SMARTFAN=DISABLED Azealea and other unused devices=DISABLED, noirqbalance grub mod, 2 glxgears for 2 hours | 1011281 | 4142 | 15390 | 17561 | |
Gigabyte H61M-S2PH Micro-ATX | Intel Pentium G860 3.0Ghz | 4 GB RAM, BIOS:CPU advance CPU settings all disabled, SMI enabled, no isolcpu used, tested with burnP5 and a big glxgears for 20 minutes | 992291 | 4615 | 35582 | 11887 | |
Gigabyte H61M-S2PH Micro-ATX | Intel Pentium G2010 3.0Ghz | 4 GB RAM, BIOS:CPU advance CPU settings all disabled, SMI enabled, no isolcpu used, tested with burnP6 and 4 GLX gears, and focing the cpu in other ways with flash, and moving big files | 992629 | 5996 | 33616 | 9457 | |
Gigabyte P35-DS4 | Intel Core 2 Quad CPU Q6600 2.40GHz | 2 GB DDR2 800 Mhz. Reducing clock multiplicator from 9 to 8 improved latency. VT enabled. ATI Radeon HD 2600XT, Open Source driver (OpenGL? xserver), isolcpus=3; Load: stress -c 16 -i 1 -m 1 -t 36000, watch dvd and youtube, browse, virtual windows machine (vmware player) | 1000079 | 4079 | 30494 | 5632 | |
Gigabyte P35-DS4 rev1.0 | Intel Core 2 Duo E8400 3.0GHz | Wheezy 7.9 from LiveCD? installed on WD HDD; Windowmanager: i3 because xfce gives 17k latency spikes; 4x1GB RAM, Club3D ATI Radeon X300 256MB; nohalt nohz=off isolcpus=0 acpi_irq_nobalance noirqbalance lapic; irqs mapped to cpu0 (set-irq-affinity 1); BIOS: everything from auto to manual, disable every powersaving/overclocking feature, disable every peripheral except LPT and LAN; Load: 5xglxgears, 1080p video in VLC, a bit of firefox surfing, tested for 3h:45m | 1002908 | 6887 | 31725 | 6818 | |
Gigabyte J1800 and J1900 | Mini ITX Intel Atom | WARNING - Rev 2 of BIOS does not work with anything but Win 8 and unable to detect any file systems. Even when updated reports of complete incompatibility with rtai kernels, usb does not work etc. etc.UPDATE:- USB issue fixed with Debian Wheezy based distro with 3.4.55-4-rtai kernel - still be aware that BIOS upgrade may be required before it can be used with linux | |||||
HP Compaq 315eu MT | AMD Athlon II X2 245, 2Gb Ram Radeon HD 3000 onboard video @1280x1024 | LinuxCNC 2.7 wheezy image (downloaded 23.nov 2017), "noapic pnpbios=0 acpi=0 isolcpus=1", not usable without grub boot argument tweaking. Very nice values while running firefox /streaming youtube videos, running glxgears, cat /dev/urandom and more. 100% cpu load while running latency tests. | 1002193 | 3713 | 28933 | 3971 | |
HP Compaq 8100 Elite CMT PC, HP 304Bh | i7-860 @ 2.80GHz | 10.04LTS LiveCD, nVidia GT215(GeForce GT 240), HT enabled in BIOS, 8 CPUs shown to OS. many instances of "gzip -c /dev/urandom > /dev/null" to load up CPUs to 100%, ran test for 10-15min | 991469 | 9885 | 30647 | 5934 | |
HP Paviliion t3000 on-board graphic (Radeon Xpress G800) | AMD2.4 GHz | Jitter increased dramatically with network use. I won't have a network connection to the machine. | 1014699 | 17649 | 43168 | 18448 | |
HP DC7600 | P4 3Ghz | 4GB RAM, On board video, Ubuntu 10.04 LTS installed from LiveCD?, HT Disabled in BIOS, 2x glxgears running, snd kernel modules disables, SMI disabled | 1000587 | 6107 | 31292 | 6430 | |
HP DC5000 Micro Tower | P4 3.0 GHz | 2 GB Ram, Ubuntu 10.04 | 1009254 | 14863 | 47866 | 23004 | |
HP DC5000 Micro Tower | P4 3.0 GHz | 2 GB Ram, Ubuntu 8.04, same machine as above. Latency was higher than 10.04 but nonetheless it ran the 201 Gecko much better than 10.04 | 1021854 | 25349 | 63558 | 39253 | |
HP DC5000 Micro Tower #2 | P4 3.0 GHz | 1 GB Ram, 8.04 Live CD (wouldn't run 10.04) | 1045225 | 48720 | 63985 | 39680 | |
HP DC5000 Micro Tower #2 | P4 3.0 GHz | 1 GB Ram, 8.04 installed to HD | 1020793 | 24288 | 58052 | 33747 | |
HP DC5000 Micro Tower #2 | P4 3.0 GHz | 1 GB Ram, Debian Wheezy live USB, note ran decent on 8.04 but crap on Wheezy | 1642741 | 647541 | 193858 | 168978 | |
HP DC7600 (UK) | P4 (531) 3Ghz | 4GB Ram (same results using 1GB). On-board i915 graphics. LinuxCNC 10.04 installed to 40GB Sata (same results with 8.04 AND Debian Wheezy with custom kernels). BIOS settings: load defaults and set "Idle Power Saving" = Normal and Hyperthreading = Disable and "Device Security > System Audio" = hidden. Disabling ACPI/networking/etc gave no improvement. Tested SMI fix but NOT required on 82801GB chipset. Will run <7K with minimal loading (as reported above). Given a more realistic test by opening/closing Firefox approx 10 - 15 times - this will produce worst-case latency within minutes. | 1004998 | 6598 | 50383 | 25423 | RTAI |
HP / Compaq DC7800 SFF | Core 2 Duo (E6750) 2,66Ghz | 4GB Ram. On-board Intel GMA graphics. Disabled all energy saving parameters in BIOS. Disabled Audio and the 2 serial ports. System has onboard parallel port with EPP+ECP set. If you let the Computer run for about 30 min. jitter values will increase (around 5-7%). Disabeling of components doesn't have to much impact. Installed from Live CD (Debian, LinuxCNC 2.6, Sept. 2014). Values are approx. | 1032000 | 34500 | 36000 | 12500 | |
HP Compaq elite 8300 CMT | i5-3570 quad-core 3.40GHz | Onboard display 1920x1200 32GB ram KDE dphys-swapfile - Kernel commandline "quiet text isolcpus=2,3" - Buster PREEMPT_RT | 1005664 | 5920 | 33517 | 8517 | |
IBase MB896IL | Pentium M x 1,73GHz | 1 GB RAM, Debian Wheezy on HDD,Dissabled Onboard Sound&COM Ports, Disabled energy saving modes | 1007936 | 9416 | 37066 | 12267 | |
IBM MT-M 8215 9AU | P x 2 3.4 GHz | 2 GB Ram, Debian Wheezy live USB, this box didn't run well on 8.04 or 10.04, either | 1275970 | 281450 | 328707 | 303844 | |
IBM PC 300GL | PII 400 MHz 128MB RAM Ubuntu804 | S3Trio 3D graphics Networking disabled | 1004298 | 7793 | 32224 | 7995 | |
IBM Thinkpad T40 (Type 2373) | Intel(R) Pentium(R) M processor 1500MHz | 749MB RAM, 6GB HD, port 0x3BC, must boot with lapic option (details http://support.lenovo.com/en_US/detail.page?LegacyDocID=MIGR-58185) | 1008062 | 12822 | 45352 | 20955 | |
IBM Thinkpad 600X w/ Bios version 1.11 | PIII 500 MHz | 320mb RAM. Runs great with Ubuntu 8.04. Lousy with 6.06. | 1009205 | 12700 | 42175 | 17870 | |
Lenovo ThinkCentre? M58 - 7359AWG w/ BIOS 5CKT50AUS | Core 2 Duo E7400 @ 2.8GHz | 4Gb RAM. Audio disabled. No Legacy set. isolcpus set to 1. Running Wheezy. Test run for 7h with glxgears (and screensaver). USFF but three SATA, one 5.25 bay, one 3.5 bay. One PCI slot takes one low-profile card only (Mesa 5i25 fits fine). Detailed spec https://www.cnet.com/products/lenovo-thinkcentre-m58-7359-core-2-duo-e7400-2-8-ghz | 1011201 | 23296 | 36882 | 17201 | 3.4.9-rtai-686-pae |
Intel D425KT Mini ITX | Intel Atom D425 single core 1.8GHz | 2GB RAM, disabled Hyperthreading, disabled onboard audio, LinuxCNC liveCD 10.04, 4 x glxgears + firefox running for 10 hours | 1010059 | 14915 | 43769 | 20283 | |
Intel D201GLY Mini-ITX Integrated SiS Mirage 1 graphics SiS662 Northbridge SiS964L Southbridge | Integrated Intel Celeron 215 1.33GHz CPU w/Heatsink and Fan | Shared video mem set to 128Mb Marginal for use with software step generation? | 1086886 | 90381 | 66527 | 42222 | |
Intel DG33BU | E6850 Core 2 Duo, 3 GHz | Asus GeForce 8200 graphics card | 1004554 | 8879 | 35151 | 13099 | |
Intel D945GCLF2 mini-ITX | Atom 330 2x 1.6Ghz | Specifications: http://www.intel.com/products/desktop/motherboards/D945gclf2/D945gclf2-overview.htm Note: Tested using xubuntu | 1002816 | 6484 | 30998 | 7148 | |
Intel ITX ECS 945GCD-CI | Atom 230 1,6GHz | ITX ECS 945GCD-CI DDR2 Atom 230 1,6GHz, 1GB - 533GHz RAM (GoodRam? ), running from USB flash stock iso (linuxcnc-2.7-wheezy.iso), opened only file manager, (in brackets measure - glxgears at half screen) | 996272 (1002739) | 4912 (14499) | 42260 (43884) | 17664 (19770) | |
Intel D525MW mini-ITX | Atom D525 1.8Ghz | Note: Tested using ubuntu 10.04 | 1010065 | 15595 | 36800 | 11921 | |
Intel D945GCLF2 mini-ITX | Atom 330 2x 1.6Ghz 1 GB DDR 667 | Linux 2.6.30.5 + RTAI 3.7.1 with SMP support hyperthreading is disabled from BIOS 2nd core is isolated from GRUB with "isolcpus=1" Debian Lenny from LiveUSB (no harddisk) onboard video with Intel driver | 996381 | 5101 | 30121 | 5428 | |
Intel D945GCLF2 mini-ITX | Atom 330 2x 1.6Ghz 1 GB DDR 667 | Debian Wheezy installed, hyperthreading turned off, audio turned off, 07_rtai added to grub | 1003177 | 12613 | 40873 | 17347 | |
Dell 745 | Intel Core2 2.13Ghz x 2, 2Gb Ram | Debian Wheezy | 1058625 | 61745 | 45967 | 21045 | |
Dell 745 | Intel Core2 2.13Ghz x 2, 2Gb Ram | 10.04 | 1060868 | 61628 | 48102 | 23121 | |
Jetway J7F2WE1G | 1.0Ghz Via | Via Unichrome on-board 256M ram - vesa driver via driver has opengl issues | 1005013 | 8902 | 32938 | 9020 | |
Jetway J7F2WE1G5D mini-ITX | VIA C7 1.5Ghz | Specifications: http://www.jetway.com.tw/jetway/system/productshow2 | |||||
MSI P4M890 | Intel Core 2 6600 | Note: tested with fresh install of linuxcnc 2.7.0 live, AGP Radeon 6450. Boot parameters "lapic quiet rootdelay=5 isolcpus=1 idle=poll acpi_irq_nobalance noirqbalance" and tweaked irq affinity as here (https://forum.linuxcnc.org/18-computer/25927-reducing-latency-on-multicore-pc-s-success?limitstart=0), "for" loop stripped from irq-affinity.conf and pasted to /etc/rc.local. Test time about three hours with 6 fullscreen glxgears, vlc fullscreen video loop (read from DVD) and reading linuxcnc doc with iceweasel pdf plugin. Before tweaking irq affinity, getting spikes of about 30000 ns max jitter | 1005137 | 9057 | 40159 | 15279 | |
Dell Optiplex 960 SFF | E8500 Core 2 Duo, 3Ghz | 4 GB Ram (DDR2 - 800), 80GB HDD, BIOS Version A18, LinuxCNC 2.7.8 before tweaking max jitter (1ms) at 22685 and max jitter (0,25ms) at 15651. Values got much better with tweaking, please follow the instructions here: https://forum.linuxcnc.org/18-computer/25927-reducing-latency-on-multicore-pc-s-success?limitstart=0 , SMI tweaking not done and required; BIOS Audio off, Raid off (set to legacy) Power saving deactivated; Warning: at using the displayport, the system does not accept any pcie I/O cards (parallel or Mesa) if the displayport used, it appears a message with the conflict! | 1001366 | 4246 | 29227 | 4299 | RTAI |
Dell Optiplex 7010 | Intel Core i5 | BIOS Settings changed to use only one core, all power saving options disabled. Onboard Graphics without problem DeLock? PCIe Parallel card @ 0xe010. Debian Wheezy | 991765 | 4233 | 32324 | 7626 | RTAI |
Dell Optiplex GX620 | Pentium D 2.8GHZ 2 MB Ram | BIOS rolled back to version A10, all power saving options disabled. Onboard Graphics without problem Debian Wheezy Went from jitter of over 1,000,000 to 25000 with the BIOS rollback. | 1004580 | 7210 | 50339 | 25402 | RTAI |
Dell Optiplex 780 | Core2Duo E8400 | Latest bios, Integrated Graphics (all three dedicated cards tried yielded results above 150k), 2GB RAM, SSD, dual parallell port pci card, multicore turned off (running single core style), all performance options but thermal monitor disabled in bios. Running 3.4-9-rtai-686-pae with idle=poll, rest stock settings. Testing for two days with CPU burn test, multiple glxgears, streaming youtube during whole test. Copied /usr around a couple of times for good measure. | 23848 | 24598 | 2.4.9-rtai-686-pae | ||
[Optiplex 755] | Core(TM)2 Duo CPU E6550 @ 2.33GHz + 4GB | Test load and machine configuration as per: https://copr.fedorainfracloud.org/coprs/dwrobel/kernel-rt/ | 1021392 | 21392 | 41900 | 16900 | 5.6.14-200rt7.fc31 |
Asus Prime A520M-E | Ryzen 3 3100X | Dual Ethernet card, dual parport card, Radeon HD3450, 2 ram sticks. Everything disabled in bios. CPU undervolted to reduce baseclock to 2.8GHz to keep cooler with idle=poll and cstate. Boot params "isolcpus=2,3 idle=poll processor.max_cstate=0" running synthetic benchmarks overloading the machine during test for 5+ hours | 1002006 | 2006 | 29596 | 4596 | 4.19.0-13-rt |