[rtl] Re: *Fast* IRQ response ( 2.08us )

[Daniele Lugli <danlugli@tin.it>]

C. W. Wright (1698) wrote:

> Greetings,
>
>    I just measured the time from the leading edge of the IRQ signal to the
> leading edge of a pulse generated by my rt-linux handler at 2.08us most of
> the time and sometimes just under 4us.   The measurements made using a
> Lecroy 9384 1gHz digital scope with one probe on the irq signal and the
> other on the LPT port I'm pulsing.
>
> The system is 2.0.29 rtl 0.6, 200mhz p5 with 64mb ram, 3-4gb scsi drives,
> 500ms/s Gage PCI waveform digitizer, and an ISA board full of specialized
> PIC chips.
>
> Looking at the signals on the scope, they appear virtually jitter free and
> very clean.  Even when running  " find / -name dlfkldf -print " the
> signals remain stable.  This is just the opposite of how windoze reacts
> of course.

I am really very interested in your results and I would like to perform the
same test on my pc. Could you explain me where do you pick up the irq signal
and, if possible, send me a copy of your test program?
Best regards,
Daniele Lugli


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