The HyperNews Linux KHG Discussion Pages

## How fast are IRQ's serviced

  Forum: Device Drivers
  Keywords: IRQ Interrupt-Handler Interrupt
  Date: Fri, 19 Sep 1997 07:44:55 GMT
  From: Tim Krieglstein <tstone@rbg.informatik.th-darmstadt.de>

I"m *trying* to write a device driver for a custom ISA-Card. The Hardware is very simple and produces an Interrupt every 20e-06 seconds. So the Interrupt should be serviced at least after 10e-06 seconds. After Browsing Kernel Code I saw that there are done some things *before* the custom Interrupt-Handler (set by request_irq) is called. My Question now is (there where to much moacros for me in K-Code): How long (on a P133 for example) does it take under Linux until the custom Interrupt-Handler is called? I've written an Handler under DOS already, wich works fine. So I know that my Maschine is fast enough to do the job... But it would be much better if it could be done under Linux. By the way: The KHG helped me a lot until now!

Messages

1. Sounds like you want hard real-time performance by Michael K. Johnson