Messages in this thread |  | | Date | Thu, 4 Oct 2001 12:25:13 +0200 (CEST) | From | Ingo Molnar <> | Subject | Re: [announce] [patch] limiting IRQ load, irq-rewrite-2.4.11-B5 |
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On Thu, 4 Oct 2001, BALBIR SINGH wrote:
> Shouldn't the interrupt mitigation be on a per CPU basis? [...]
this was done by an earlier version of the patch, but it's wrong. An IRQ cannot arrive to multiple CPUs at once (well, normal device interrupts at least) - it will arrive either to some random CPU, or can be bound via /proc/irq/N/smp_affinity. (there are architectures that do soft-distribution of interrupts, but that can be considered pseudo-random)
But in both cases, it's the actual, per-irq IRQ load that matters. If one CPU is hogged by IRQ handlers that is not an issue - other CPUs can still take over the work. If *all* CPUs are hogged then the patch detects the overload.
Ingo
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