Hi Siddharth,
IRQ stands for Interrupt ReQuest, which is a request from a piece of
hardware (or software for that matter) to interrupt the processor to do
something for the requester. When an IRQ is made, the processor jumps to a
specific piece of code to handle the interrupt. Indeed the IRQ number
indicates the priority of the request. However, IRQs with a lower prio are
placed in a queue and handled when the high-prio request is done. In
principle hardware that needs to be handled very quickly should be a high
IRQ level, while hardware with low priority (like keyboard, IDE) can wait a
while before being handled. If your interfaces are heavily loaded and you
experience problems with the primary, in principle it would be advisable to
give it the highest prio. I think however, that the level of load that would
be required for this should allready generate plenty of other problems
before the IRQ issue kicks in. Of course, comments on this from others are
welcome.
Vriendelijke Groeten / Kind Regards,
Alexander van Luijpen
Philips Semiconductors Nederland
Test and Product Engineering
MOS4YOU - C075 OTP / Consumer Systems Nijmegen - BL Video
email: [EMAIL PROTECTED] email:
[EMAIL PROTECTED]
tel: (+31)-24-353 4639
tel: (+31)-24-378 9475
> -----Original Message-----
> From: Siddharth Srivastava [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, March 29, 1999 12:51 AM
> To: [EMAIL PROTECTED]
> Subject: IRQ priority?
>
>
> is it true that the IRQ's for the devices have priorities,i.e IRQ n has a
> higher prio than IRQ n+1.
> in that case if i have my NIC's at IRQ's 5,9 & 11,and am using all of
> them,how will the application(if at all) be affected by the different
> priorities at which the cards are being interrupted?
>
> further if my primary interface(eth0) is using IRQ 11, and others are at 5
> & 9 i.e higher priority,what are the consequences and how will user
> applications feel it?
>
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