Hi Victor,
The version was RTAI-1.3 and Linux 2.2.14 on top of a RedHat 6.2, the
machine was an Inspiron 7000 with bios power saving disabled (disk power
down etc) but with APM support in the Linux kernel. I'll be running the
same test on RTLinux 2.3 and post the results.
Regards, Stuart.
[EMAIL PROTECTED] wrote:
>
> Stuart:
> What's the version information on this?
>
> On Thu, Jun 01, 2000 at 11:39:29AM +0100, Stuart Hughes wrote:
> > I always knew that APM was bad news for realtime (as it does cli etc),
> > but I was not aware that gettting the APM info from proc was also a
> > disaster. While running some jitter tests that normally give +/- 7usec
> > on a quite machine, I did a cat /proc/apm, this pushed the upper limit
> > to 7milliseconds. So beware, just running a little X helper like xapm
> > (now disapeared from the latest redhat) will cause your realtime to
> > miss-behave.
> >
> > Conclusion: If you have APM enabled at all, beware as your real-time
> > programs can go out to lunch (even things as innocent as plugging in the
> > power cable to your laptop).
> >
> > Regards, Stuart
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> --
> ---------------------------------------------------------
> Victor Yodaiken
> FSMLabs: www.fsmlabs.com www.rtlinux.com
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