On Thu, Mar 01, 2001 at 10:44:41PM -0500, C. W. Wright (1698) wrote:
> After I did this, everything worked properly. I wrote a very simple irq
> program which simply writes 0xff, 0x00 to the printer port so I could
> observe the interrupt response time. THe typical time from the rising
> edge of my interrupt generator, to the rising edge of the printer pulse is
> about 9-microseconds. This with no load, on a 600mHz athlon using a 2.2.18
> and rtlinux-3.0 both of which I downloaded from the rtlinux site two days
> ago. When I did this same test two or three years ago with a 200mhz
> pentium and linux-2.0.27, some early rtl patch, I got nominal response
> times of about 2-microseconds. It's strange that its slower now. Perhaps
> the motherboard?
Everything seems slower these days, but I bet it's the motherboard.
We are getting wider and wider divergence in results as more and more
wierd designs appear. Try changing the mode of the printer port to EPP
and see what happens.
>
> C. Wayne Wright
>
>
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