USB_CLAIM_BANDWIDTH

Section: (9)
Updated: 13 April 2004
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NAME

usb_claim_bandwidth - records bandwidth for a periodic transfer

SYNOPSIS

void usb_claim_bandwidth (struct usb_device * dev, struct urb * urb, int bustime, int isoc);

ARGUMENTS

dev: source/target of request
urb: request (urb->dev == dev)
bustime: bandwidth consumed, in (average) microseconds per frame
isoc: true iff the request is isochronous

DESCRIPTION

Bus bandwidth reservations are recorded purely for diagnostic purposes. HCDs are expected not to overcommit periodic bandwidth, and to record such reservations whenever endpoints are added to the periodic schedule.

FIXME averaging per-frame is suboptimal. Better to sum over the HCD's entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable for EHCI (256/512/1024 frames, default 1024) and have the bus expose how large its periodic schedule is.

ABOUT THIS DOCUMENT

This documentation was generated with kernel version 2.6.1.

This document was created by man2html, using the manual pages.
Time: 11:22:03 GMT, April 13, 2004