Re: MSI to memory?
From: Helge Hafting
Date: Wed Jul 07 2004 - 07:44:00 EST
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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