Re: [sched] [patch] migration-fixes-2.5.3-pre2-A1

Manfred Spraul (manfred@colorfullife.com)
Sun, 20 Jan 2002 15:26:23 +0100

> */
> #define SPURIOUS_APIC_VECTOR 0xff
> #define ERROR_APIC_VECTOR 0xfe
> #define INVALIDATE_TLB_VECTOR 0xfd
> #define RESCHEDULE_VECTOR 0xfc
> -#define CALL_FUNCTION_VECTOR 0xfb
> +#define TASK_MIGRATION_VECTOR 0xfb
> +#define CALL_FUNCTION_VECTOR 0xfa
>
Are you sure it's a good idea to have 6 interrupts at priority 15?
The local apic of the P6 has only one in-service entry and one holding
entry for each priority.

I'm not sure what happens if the entries overflow - either an interrupt
is lost or the message is resent.

<<<< Newest ia32 docu, vol3, chap. 7.6.4.3:
The P6 family and Pentium processor's local APIC includes an in-service
entryy and a holding entry for each priority level. Optimally, software
should allocate no more than 2 interrupts per priority.
<<<<<

<<< Original PPro, Vol 3, chap 7.4.2:
The processor's local APIC includes an in-service entry and a holding
entry for each proirity level. To avoid losing interrupts, software
should allocate no more than 2 interrupts per priority.
<<<<<

--
	Manfred
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/