Re: question on incoming packets and scheduler

[Davide Libenzi]

On Tue, 14 Oct 2003, Chris Friesen wrote:

>
> I have a long-running cpu hog background task, and a high-priority
> critical task that waits on a socket for network traffic.  When a packet
> comes in, I'd like the cpu hog to be swapped out ASAP, rather than
> waiting for the end of the timeslice.  Is there any way to make this happen?
>
> The code paths that I managed to trace didn't seem to be calling the
> scheduler to force the context switch.  Hopefully I missed something.

What do you mean for high priority? Is it an RT task? The wakeup (AKA
inserion in the run queue) happen soon :
IRQ->do_IRQ->softirq->net_rx_action->ip_rcv->...
but if your task is not RT there no guarantee that it'll preempt the
current running.



- Davide

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