--- On Sun, 5/23/10, Grant <emailgrant@xxxxxxxxx> wrote: > > > ehci-hcd has a module parameter named log2_irq_thresh. > Is that > > what you're interested in? It is the Interrupt > Threshold Control value > > in the EHCI USBCMD register. > > What function does the USB Interrupt Threshold Control > value have? See the EHCI spec. Basically, it affects how long the hardware waits before reporting interrupts. Longer waits mean slower response times and worse throughput. Leave it alone. > I'm actually more interested in tuning OHCI than > EHCI. It looks like > log2_irq_thresh can be applied to usbcore No it can't. as well as > ehci-hcd, but I > can't find mention of it related to ohci-hcd. It's EHCI-specific, and unrelated to OHCI. The OHCI driver has no tuning knobs like that EHCI value. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
