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Re: [Xen-devel] Interrupt forwarding

On 12 Mar 2005, at 18:11, Ian Pratt wrote:

Shared interrupts aren't good news for performance, but they work OK.

If a driver domain locks up we can kill and restart it -- for safety we
don't rely on it to ack the interrupt.

Shared interrupts are slightly worse because the irq won't get unmasked until all receivers say their work is done. If one lock sup it starves the rest -- until this is detected and that domain gets blown away.

Fortunately the days of shared interrupts are numbered with MSI and PCI-Express.

 -- Keir

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