Method and apparatus for implementing directory organization to selectively optimize performance or reliability
AssigneeInternational Business Machines Corporation
InventorsGerald Bartley, John Borkenhagen, William Hovis, Daniel Kolz
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Abstract
A method, and apparatus are provided for implementing a directory organization to selectively optimize performance or reliability in a computer system. A directory includes a user selected operational modes including a performance mode and a reliability mode. In the reliability mode, more directory bits are used for error correction and detection. In the performance mode, reclaimed directory bits not used for error correction and detection are used for more associativity.
Claims16
A method for implementing a directory organization to selectively optimize performance or reliability in a computer system comprising:
- receiving a user selected operational mode of a performance mode and a reliability mode;
- responsive to user selected operational mode of the reliability mode, providing directory rows having a predefined number of directory bits used for error correction and detection;
- and
- responsive to user selected operational mode of the performance mode, providing directory rows having fewer than said predefined number of directory bits used for error correction and detection.
Apparatus for implementing a directory organization to selectively optimize performance or reliability in a computer system comprising:
- a control register for receiving a user selected operational mode of a performance mode and a reliability mode;
- a predefined number of directory bits used for error correction and detection with a directory row for user selected operational mode of the reliability mode;
- and
- a smaller number than said predefined number of directory bits used for error correction and detection with a directory row for user selected operational mode of the performance mode.
Dependencies are inferred from the claim text.