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Patch 4: Interrupts/
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Michael D 2019-10-10 19:57:27 +02:00
parent 99e156101a
commit a047b17551
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Interrupts/linux-interrupts-7.md
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@ -159,7 +159,7 @@ In other way, when the `CONFIG_X86_IO_APIC` kernel configuration option is set,
We remember from the previous parts, that the amount of processors we can set during Linux kernel configuration process with the `CONFIG_NR_CPUS` configuration option: We remember from the previous parts, that the amount of processors we can set during Linux kernel configuration process with the `CONFIG_NR_CPUS` configuration option:
![kernel](http://oi60.tinypic.com/1zdm1dt.jpg) ![kernel](images/kernel.png)
In the first case (`CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT`), the `NR_IRQS` will be `4352`, in the second case (`CPU_VECTOR_LIMIT < IO_APIC_VECTOR_LIMIT`), the `NR_IRQS` will be `768`. In my case the `NR_CPUS` is `8` as you can see in the my configuration, the `CPU_VECTOR_LIMIT` is `512` and the `IO_APIC_VECTOR_LIMIT` is `4096`. So `NR_IRQS` for my configuration is `4352`: In the first case (`CPU_VECTOR_LIMIT > IO_APIC_VECTOR_LIMIT`), the `NR_IRQS` will be `4352`, in the second case (`CPU_VECTOR_LIMIT < IO_APIC_VECTOR_LIMIT`), the `NR_IRQS` will be `768`. In my case the `NR_CPUS` is `8` as you can see in the my configuration, the `CPU_VECTOR_LIMIT` is `512` and the `IO_APIC_VECTOR_LIMIT` is `4096`. So `NR_IRQS` for my configuration is `4352`: