On 10/12/05, Art Fore art.fore@comcast.net wrote:
The PCI interrupt line was monitored with a scope. Driver was the same in both cases.
Ok so you are watching for the IRQ ack from the IRQ driver. I don't know a whole lot about the deep internals of the windows irq stack. Does the system ACK the IRQ and pass up up a notification or when you hook the IRQ is your driver responsible for all that.
By driver I meant the chipset driver so they can't be the same. Via vs nvidia. I would guess that the difference is in the way the chipset driver deals with interrupts.
Unless you can somehow track it down to a setting in the chipset I doubt linuxbios will be much help.
Are you using some type of RTOS extensions for XP? I wasn't aware that you could get response times that small with XP.
-- Richard A. Smith