Re: [Xen-ia64-devel] Event channel vs current scheme speed [wasvIOSAPIC and IRQs delivery]

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 09 Mars 2006 21:02, Tian, Kevin a écrit :
> Anyway, good discussion by far though still some way to go for
> consensus. :-)
>
> Maybe we want to look at this from another way - fairness.
[...]
> Regarding current model, there seems to be an issue about fairness
> between physical interrupts and "xen events". Taking current 0xE9 for
> example, it's lower than timer but higher than all external device
> interrupts. This means "xen events" will always preempt device interrupts
> in this case, which is unfair and not what we want.
To my understanding, this is also true for x86.
With event channel, real physical IRQs use events 0-255, while Xen events use 
events 256-511.

So what is the difference ?

Tristan.


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