This might not be of any help to you but my home machine - an IBM E Series X
Server 205
is unusable for EMC because of the RTAI delay problems. I only run in Sim
mode at home
(duh!) but put up with and ignore the errors just to see how a job will run.
Running the latency test on this machine shows well over 1,000,000 (count
the zeros).
I think I've checked all the usual bios things to no avail. I will re-check
all those settings
and post back the results. This machine runs great for all other software
and I've never
noticed any glitches in day to day things I do. Some motherboards just don't
seem to be
suited for rtai.
-- Emory
On Sat, Sep 27, 2008 at 20:06, Peter Boyer <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> This is a first time posting so excuse my newbie-like characteristics. I
> just finished building a CNC router and am using EMC2 to control it on a
> Hardy Heron install. My computer is a P4 1.8Ghz Desktop, Matrox Video Card,
> with 512 MB ram. Presumably, I have an intel chipset.
>
> On my first occasion running the software on my router, I got the dreaded
> "Unexpected realtime delay; check dmesg for details" error. I ran the "RTAI
> latency calibration tool" and observed the kind of 64 second periodic ~150
> ms increases increases in latency typical of an SMI (System Mangement
> Interrupt) issue. After finding an article on the EMC2 wiki directly
> relating to turning off SMI, I felt very happy and proceeded to implement
> the solution.
>
> I "implemented the solution" by opening rtapi.conf and editing the file
> exactly as detailed in the wiki article called "Fixing Realtime problems
> caused by SMI on Ubuntu." I was somewhat confused by the article when it
> told me to skip to step 6, which instructs the user to copy the rtai_smi.ko
> module to the appropriate directory - as I understand it, I didn't need to
> do this on a Hardy Heron install as the module is already present. After
> installing the module, I ran EMC2 and gave the system a lsmod and saw that
> the rtapi_smi.ko was running as expected.
>
> HOWEVER, I still have (seemingly) the same latency issues as I had before.
> I still get the "Unexpected realtime delay; check dmesg for details" error.
>
> SO, my questions are:
>
> 1) Is there some other similar form of latency that would cause this same
> problem?
> 2) Might I need to actually compile another rtapi_smi.ko module in order
> to fix the problem?
> 3) I did just do something flat out wrong when I tried to fix the
> problem?
> 4) What is ACPI and APM? (I have not attempted to turn it off yet.)
>
> I'm pretty frustrated and don't really know where to turn. Any ideas?
>
> All the best,
> Peter
>
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