Re: controlling ACPI IRQ routing

[Lee Howard <faxguy@howardsilvan.com>]

Shaohua Li wrote:
> Currently vector is allocated when pci_enable_device is called. So which
> vector is allocated depends on how many drivers already called the
> routine. The first vector is 0x31, later higher priority (higher) vector
> will be allocated. In latest kernel, a vector of a irq could be variable
> when irq affinity is set, so it's much complex. There is no existing
> method to reserve a vector for a device.

The systems I've been using are all single-processor AMD x86 or x86_64 
systems.  So I doubt that IRQ affinity applies in these cases.

I've made the driver get "preloaded" through mkinitrd/initrd on 
boot-time, but that doesn't seem to make a difference in device performance.

Is it possible to see in 'dmesg' output which vector was allocated to 
which IRQ/device?

Thanks,

Lee.