02-01-2012
I'm sure it's interrupt-based -- powertop on my laptop would show the USB driver if it were polling all the time, it certainly showed my network driver doing so -- but nobody except people who write device drivers for USB can tell you much more. You might have more luck looking at specification sheets, like the
EHCI specification.
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URL(4) BSD Kernel Interfaces Manual URL(4)
NAME
url -- Realtek RTL8150L USB Ethernet driver
SYNOPSIS
url* at uhub?
urlphy* at mii?
DESCRIPTION
The url driver provides support for USB Ethernet adapters based on the Realtek RTL8150L USB-ether bridge chip.
The url driver supports the following adapters:
CompUSA USBKR100
GreenHouse GH-USB100B
Melco Inc. LUA-KTX
Sitecom LN013
For more information on configuring this device, see ifconfig(8).
DIAGNOSTICS
url%d: watchdog timeout A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the
transmission before a timeout expired.
url%d: no memory for rx list The driver failed to allocate an mbuf for the receiver ring.
SEE ALSO
arp(4), mii(4), netintro(4), usb(4), ifconfig(8)
HISTORY
The url device driver first appeared in NetBSD 1.6.
AUTHORS
The url driver was written by Shingo WATANABE <nabe@nabechan.org>.
BSD
September 18, 2006 BSD