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- Join Date
- Apr 2006
Interrupt Scheduling @ Kernel 2.4.18
I need help.
I'm using Kernel 2.4.18 on an embedded Linux system (ARM) with 206 MHz.
When using UDP at the LAN interface there is a loss of telegrams when the number of telegrams is increased.
The LAN controller chip is a SMSC91C111 and uses interrupts.
I think that the Kernel scheduler does not handle all interrupts from the controller chip and so I need more information on how the Kernel scheduler works with special regard on interrupts.
May be there is a constant time for an interrupt handler of e.g. 1 ms and if there if there are 10 interrupts at the same time some are ignored, know what I mean? Or is this ********?
AFAIK, the linux kernel can be executing these 4 types of code:
1- Hardware interrupts
2- Software interrupts (like a timer)
3- Kernel code with no user process associated
4- Kernel code in user process context
The upper ones can preempt the lower ones, so if a hardware interrupt arrives, it has a higher priority than the other types of code. I'm not sure, but I don't think that the kernel looses some interrupts.