Messages in this thread | | | Date | Wed, 6 Jun 2018 11:34:43 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: question about the limited interrupt vector resource on a single cpu |
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On Wed, 6 Jun 2018, Pingfan Liu wrote:
> On Wed, Jun 6, 2018 at 5:15 PM, Thomas Gleixner <tglx@linutronix.de> wrote: > > On Wed, 6 Jun 2018, Pingfan Liu wrote: > > > >> For x86, there is around 200 vectors left for external device on a > >> single logic cpu. > >> > >> Is there any case that we exhaust them in real world, and is it worth to fix? > > > > Exhaustion is unlikely, but how would you fix it? The vector space per CPU > > is limited by hardware not software. > > > Playing some trick on iommu, we can use it to identify the irq requester.
But what's the point? If you have more than 200 device interrupts on a single CPU, then you surely have other problems than that.
What kind of problem are you trying to solve?
Thanks,
tglx
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