>> > 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. Can the value be read? - Grant >> 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
