[aclug-L] Re: IRQs (Was: Which X is your favorite)

[Jonathan Hall <jonhall@xxxxxxxxxxxx>]

> Is there a way to find out what IRQs are being used, and for what?  It 
> would be nice to be able to deconflict my setserial commands instead of 
> being a total guesser.

I should have answered this in my last e-mail, too.

Try this command:

  cat /proc/interrupts

This will show a list of all IRQs that are in use __by Linux__.  This will
not report all IRQ assignments, unless they are all actually being used.
For instance, you may have COM2 set to IRQ3, but unless/until you actually
begin using COM2, IRQ3 will not show up in this list.  This is still a
good place to look, though, and can be a wonderful troubleshooting tool.

There are many other files in /proc that are useful.  /proc/ioports is
very useful--just like /proc/interrupts, it shows all the I/O addresses
that are in use by various devices.  /proc/dma does the same thing for
DMAs in use. 

Hope that helps.


- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  Jonathan Hall  *  jonhall@xxxxxxxxxxxx  *  PGP public key available
 Systems Admin, Future Internet Services; Goessel, KS * (316) 367-2487
         http://www.futureks.net  *  PGP Key ID: FE 00 FD 51
         -=  Running Debian GNU/Linux 2.0, kernel 2.0.36  =-
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -