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xen-ia64-devel
Re: [Xen-ia64-devel] Event channel vs current scheme speed [wasvIOSAPIC
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To: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx>, "Dong, Eddie" <eddie.dong@xxxxxxxxx>, "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx>, <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-ia64-devel] Event channel vs current scheme speed [wasvIOSAPIC and IRQs delivery] |
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From: |
Tristan Gingold <Tristan.Gingold@xxxxxxxx> |
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Date: |
Mon, 13 Mar 2006 10:31:53 +0100 |
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Mon, 13 Mar 2006 09:28:51 +0000 |
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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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