On Wed, Oct 25, 2000 at 04:36:51PM +0200, Stephan Hoffmann wrote:
> Hello, all!
>
> I'm running RTL 2.2 with kernel 2.2.14 as downloaded from your site on a
> small
> device containing a AMD SC410 and 8 Mb RAM and a cs8900 ethernet
> controller. Running the measurements-program provided with the RTL gives
> me a jitter of about 100 microseconds, usually -100000 to 0.
> Surprisingly, this is affected by linux programs. Running "find /" on a
> telnet session gets measurements as much as about 50 microseconds too
> late. Also the readings are different depending on wether the monitor
> process runs or not. Interesting: with monitor, the values are more
> negative:-)
>
> Can anybody out there explain, why this happens? Normally, I would
> expect that there is no influence at all from linux processes on the rt
> threads, right?
We are good, but we have not yet figured out how to make slow bus and
piggy I/O not have an affect. 50 microseconds is almost certainly a
IDE bus transaction. Try turning on UDMA and see if it's better or worse.
>
> BTW: I compiled the kernel with APM off!
>
> Thanx for any comment on this.
>
> Stephan Hoffmann
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Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
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