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SubjectRe: MSI to memory?
Davide Rossetti wrote:

> Rajesh Shah wrote:
>
>> What type of usage model did you have in mind to have the
>>
>> device write to memory instead of using MSI for interrupts?
>>
>>
> for instance for a fast wake-up trick. the driver loops on a memory
> location until the MSI write access changes the memory content...

Won't that put a bad load on the bus? Someone else might need it:
* Another cpu in a smp system
* Any device doing bus-master transfers, even in a UP system

That polling loop had better be guaranteed to be _very_ short.

Helge Hafting
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