Messages in this thread |  | | Date | Fri, 12 Jan 2001 19:16:01 +0100 (CET) | From | Ingo Molnar <> | Subject | Re: QUESTION: Network hangs with BP6 and 2.4.x kernels, hardware |
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On Fri, 12 Jan 2001, Manfred Spraul wrote:
> The PPro local apic documentation says: > <<<<<<< > The processor's local APIC includes an in-service entry and a holding > entry for each priority level. To avoid losing interrupts, software > should allocate no more than 2 interrupt vectors per priority. > >>>>>>>> > > Ok, we must reorder the vector numbers for our own interrupts > (0xfb-0xff), but that doesn't explain our problems: we don't loose > reschedule interrupts, we have problems with normal interrupts - and > there we only use 2 irq at the same priority level.
we *already* reorder vector numbers and spread them out as much as possible. We do this in 2.2 as well. We did this almost from day 1 of IO-APIC support. If any manually allocated IRQ vector creates a '3 vectors in the same 16-vector region' situation then thats a bug in hw_irq.h..
the 'loss of interrupts' above does not include external interrupts, only local interrupts (such as the APIC timer interrupt) can get lost in such a situation.
(nevertheless there is something going on.)
Ingo
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