Re: [Xen-devel] Interrupts in Xen: Dynamic-irq and Phys-irq

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18 Jul 2005, at 13:07, John Que wrote:

> The "Dynamic-irq" also appears in Dom0 (for example, when you run
> "cat /proc/interrupts" and look at the  line containing "ctrl-if" or 
> "console").
> Besides it, In dom0 there is also "Phys-irq" ; for examples,after
> running "cat /proc/interruupts" in line containing "eth0" or "ide0" or 
> "ide1".
> what is the difference between these 2 types of interrupts ?
Phys-irq's relate directly to hardware IRQ lines (e.g., eth0, your disc 
controller, etc). Dynamic-irq's are perhaps better described as 
'virtual IRQs'. They have no direct relation to physical IRQ lines, but 
originate from things like timer events in Xen, or from the other half 
of a 'split' virtual block or network driver. We call them 'dynamic 
IRQs' because the IRQ numbers are dynamically allocated. :-)
 -- Keir


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