Re: question about the limited interrupt vector resource on a single cpu

[Pingfan Liu]

On Wed, Jun 6, 2018 at 5:15 PM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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.

Regards,
Pingfan