The PCI interrupt line was monitored with a scope. Driver was the same in both cases.
Richard Smith wrote:
On 10/11/05, Art Fore email@example.com wrote:
We have two machines with AMD 64 processors, one with Asus motherboard & Via chipset. Another with Asus motherboard with Nvidia chipset. On the one with the Via chipset using WinXP, when an external interrupt is received from a stargen chip, it takes 8 microseconds for the response to the interrupt. On the Nvida chipset, it takes 40 microseconds. Both machines are running the same program (In house developed driver).
What are you looking at to determine this? It may be a driver issue and not a hardware issue. Are you flipping a bit somewhere when the interrupt is acknowlegded in the driver or when your app responds?
-- Richard A. Smith