Method for determining if data should be written at the beginnin

Details Method for determining if data should be written at the beginnin Method for determining if data should be written at the beginnin

1996-02-12

1999-01-26

Luu, Le Hien

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

395877, 711111, 711154, 711159, G06F 1300, G06F 1314

Patent

active

058647139

ABSTRACT:
A buffer, implemented in computer memory, that never wraps data around from the buffer end to the buffer beginning unless the amount of data being transferred exceeds the entire size of the buffer. Eliminating wrapping improves performance by eliminating the need for the reading device to reconstruct a contiguous block of data from multiple reads. In addition, when possible, only the beginning portion of the buffer is used, thereby minimizing the occurrence of virtual memory page faults during buffer use and increasing the probability that pages near the end of the buffer will be freed for uninterrupted use by other processes. In addition to the usual read and write pointers, the buffer in the invention adds two variables, a buffer end pointer and a marker. When necessary, the buffer end pointer indicates the end of a block of data. The marker is used to limit the use of the buffer memory to a few pages at the beginning of the buffer when possible. If a block of data is written past the marker, the next block of data is written at the beginning of the buffer.

REFERENCES:
patent: 5121114 (1992-06-01), Nagasawa et al.
patent: 5159681 (1992-10-01), Beck et al.
patent: 5210749 (1993-05-01), Firoozmand
patent: 5404511 (1995-04-01), Notarianni
patent: 5426639 (1995-06-01), Folletet et al.
patent: 5444853 (1995-08-01), Lentz
patent: 5636360 (1997-06-01), Courts et al.

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