DRI problems with ati/radeon on stable/7 r203425 [SEC=UNCLASSIFIED]

[Wilkinson, Alex]

    0n Wed, Feb 10, 2010 at 07:06:04AM -0800, David Wolfskill wrote: 

    >Well, I don't know what msi is, so I hadn't tried that.

It stands for Message Signaled Interrupts, and it's a new way for PCI
devices to generate interrupts.  Instead of asserting a hardware
signal on an interrupt line, the device does a write (using direct
memory access) to a special address.  The chipset sees the write and
generates an interrupt to the CPU.

The benefit ...

Fewer dedicated signal lines on the motherboard == lower cost.
Elimination of shared IRQs.  Guaranteed ordering between DMA
operations and the generation of the interrupt.


   -Alex

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