Surya-
You can do this with a two channel scope by measuring the IRQ on one channel and a
digital output on the other.
I put an old ISA modem (the kind with the IRQ jumpers) with a wire soldered to the
interrupt pin on the modem in the PC. Within your ISR, toggle a discrete pin (the
parallel port will do). Measure the difference on your scope. I know there is a
little additional latency exercising the digital out but this was close enough for me.
Garth Gaddy
>>> "Surya P Kommareddy" <[EMAIL PROTECTED]> 11/29/99 11:21PM >>>
Hi,
Does any one have a working code for measuring interrupt latency on
RTLinux2.0? It would be nice if someone can pass on it to me. Are there any
improvement in the interrupt and scheduling latencies in this version? BTW I
am using Redhat6.1 with 2.2.13 kernel and RTLinux2.0.
Thanks in anticipation,
Surya.
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