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)

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  • Taggers

    noun 1. a piece or strip of strong paper, plastic, metal, leather, etc., for attaching by one end to something as a mark or label: The price is on the tag. 2. any small hanging or loosely attached part or piece; tatter. 3. a loop of material sewn on a garment so that it can […]

  • Tagging

    noun 1. a piece or strip of strong paper, plastic, metal, leather, etc., for attaching by one end to something as a mark or label: The price is on the tag. 2. any small hanging or loosely attached part or piece; tatter. 3. a loop of material sewn on a garment so that it can […]



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