Re: [Emc-users] Singular realtime delay error

[Jim C. <dru...@gm...>]

could it be fsb / memory and the like are the limiting factor, and not the
CPU speed?  i've been curious how overclocking would affect the speeds
attainable.  i've only ran emc on a slightly overclocked athlon XP
barton2500 system, i might have to get around to doing some more testing,
huh.

On Tue, Mar 4, 2008 at 12:21 AM, Gene Heskett <gen...@ve...>
wrote:

> On Monday 03 March 2008, Ed Nisley wrote:
> >Gene Heskett wrote:
> >> When starting emc on its own screen, I
> >> do get a realtime error, just one that never repeats.
> >
> >That just cropped up here after I updated to 2.2.3. There's
> >one realtime error when Axis starts up, then nothing else.
> >I run it either locally or through rdc, with the same
> >results.
>
> 2.2.3, AIUI, does its own latency test at startup, and apparently seems to
> detect a lag of some kind because something related to the video isn't
> quite
> ready at the time it is getting everything initialized.  I've been
> clearing
> it and otherwise ignoring it.  Its possible that the test could be moved
> someplace else so it was done after all the initial screen redraws have
> been
> done.  But my coding expertise is fading as the years pile up, 73 of them
> now
> and I never was up to the scale of a 32 bit linux framework, I did all of
> mine on 8 & 16 bit stuff 20 years ago, usually in assembly or even
> entering
> hex by hand in a monitor program.  1802/z80(spit)/and 6x09 stuff.
>
> >The info in dmesg looks like this:
> >
> >[  187.772175] I-pipe: Domain RTAI registered.
> >[  187.772183] RTAI[hal]: <magma> mounted over
> >IPIPE-NOTHREADS 1.3-00.
> >[  187.772186] RTAI[hal]: compiled with gcc version 4.0.3
> >(Ubuntu 4.0.3-1ubuntu5).
> >[  187.772192] RTAI[hal]: mounted (IPIPE-NOTHREADS,
> >IMMEDIATE (INTERNAL IRQs VECTORED), ISOL_CPUS_MASK: 0).
> >[  187.772194] PIPELINE layers:
> >[  187.772197] f8bca780 9ac15d93 RTAI 200
> >[  187.772200] c02d1680 0 Linux 100
> >[  187.791834] RTAI[malloc]: vmalloced extent f8c3e000, size
> >2097152.
> >[  187.791902] RTAI[malloc]: loaded (global heap
> >size=2097152 bytes).
> >[  187.793705] RTAI[sched_lxrt]: loaded (IMMEDIATE, UP,
> >USER/KERNEL SPACE <with RTAI TASKs>).
> >[  187.793716] RTAI[sched_lxrt]: hard timer type/freq =
> >8254-PIT/1193180(Hz); default timing mode is periodic;
> >linear ordering of timed lists.
> >[  187.793729] RTAI[sched_lxrt]: Linux timer freq = 1000
> >(Hz), CPU freq = 2392319000 hz.
> >[  187.793732] RTAI[sched_lxrt]: timer setup = 2010 ns,
> >resched latency = 2689 ns.
>
> Humm, lemme see what I'm getting for this, crazy but I get identical
> timings,
> but my cpu is a gigahertz slower.
>
>
> >[  187.843547] RTAI[math]: loaded.
> >[  188.027891] config string '0xecf8'
> >[  190.667837] RTAPI: ERROR: Unexpected realtime delay on
> >task 1
> >
> >Running the latency tests for an hour didn't turn anything
> >up, so it looks like a startup glitch.
> >
> >Suggestions?
>
> Ignore it till 2.2.4 maybe?
>
> --
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Hardware, n.:
>        The parts of a computer system that can be kicked.
>
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