I found that USB controllers on the matherboard use lot of irqs (9, 10, 11, 5 on my DELL machine). Why is the USB system
using so many interrupts and can I eliminate a few?
Each separate controller has its own IRQ, and modern motherboards tend to have several USB 1.1 controllers as well as a USB 2.0 controller. Five controllers is not unknown, just on a south bridge.
If you have no high speed devices, you can usually save one IRQ by not loading the EHCI driver.
If you have no full/low speed devices, you can save multiple IRQs by not loading the UHCI or OHCI drivers.
Eventually, you can hook all those full/low speed devices up to a highspeed hub and just use EHCI; but not all the driver support is there yet, so you might not be able to do that.
- Dave
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