This is an attempt to record the good, bad, and the ugly of various motherboard and cpu combinations and how they work with EMC.

news 2008 05 18

This page was a great idea, tho others had different ideas and began another list

Please use THIS test , just run 'latency-test' from a terminal

Please use THIS page to post results http://wiki.linuxcnc.org/cgi-bin/wiki.pl?Latency-Test

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If you happen to have a motherboard/cpu combination already listed, please do NOT edit/delete any existing entry, but just add your own test results.

Please use the 'RTAI Latency test' listed on this page to collect the results of your system: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?TroubleShooting#RTAI_Latency_test

Runs the test for at least 15 minutes, 24 hours is better, especially on laptops.

OVL MAX of 20,000 nS is good, less is better.

ANY overrun is bad, and the system should not be used with EMC.

Mobo or PC Mfg	Model, Revision	BIOS Ver	CPU Type, Speed, Bus, Cache	Video Card, Driver	EMC Version	OVL MAX (in nS)	Date Added (yyyy-mm-dd)
Example: Acme	1000, R1	3.45	Pentium 14, 1PHz, 10KHz, 512KB	Trident 1000 onboard	EMC 99.3.1	9000	1776-07-04
Via	EPIA PX Pico-ITX	1.04	C7, 1GHz	VIA Unichrome Pro II 3D/2D AGP onboard	2.2.4 livecd	> 100,000 + overruns	2008-05-17
Tyan	S2518 (Thunder LE-T)	1.09	Dual P3 370, 1GHz, 100MHz, 256K	ATI Rage XL 4MB onboard	2.1.7	14488	2008-05-17

Update: Tyan S2518 has a known (undocumented) issue with BIOS not retaining it's setting between power cycles. Tested on three boards, replacing battery on all three.