Messages in this thread | | | From | "Etienne Lorrain" <> | Date | Tue, 11 Aug 1998 15:17:03 +0001 | Subject | Re: interrupt latency |
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> I reall wish this wasn't the case because I would dearly > love to be able to have interrupt latency as a benchmark > test in lmbench. Are you sure there is no way to do this > in software? What if you had some way to generate interrupts > essentially continuously?
Hi,
What you could do is to look at how drivers auto-detect the interrupts of their hardware, there is often few bits to change in I/O space to trigger an IRQ (different for each video/serial/IDE... boards and ISA/PCI bus).
So unload the module managing the card, setup the interrupt handler, store the time from the Pentium timestamp, generate the IRQ by changing the special I/O bits, store the time in the interrupt handler, clean the hardware and reload the module.
Have fun, Etienne.
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