tagged queueing
<hardware> A method allowing a device or controller to process commands
received from a device driver out of order. It requires that the device driver
attaches a tag to each command which the controller or device can later use to
identify the response to the command.
Tagged queueing can speed up processing considerably if a controller serves
devices of very different speeds, such as an SCSI controller serving a mix of
CD-ROMs and high-speed disks. In such cases if a request to fetch data from the
CD-ROM is shortly followed by a request to read from the disk, the controller
doesn't have to wait for the CD-ROM to fetch the data, it can instead instruct
the disk to fetch the data and return the value to the device driver, while the
CD-ROM is probably still seeking.
(1997-07-04)
Nearby terms:
Tactile User Interface « tag « Tagged Image File
Format «
tagged queueing » tagged types » tag name » tail
circuit
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