International Business Machines Corporation

David Har

Charles Otto Schulz

Kwok-Ken Mak

Robert Brett Tremaine

T Basil Smith, Iii

R Brett Tremaine

In a processing system having a main memory, wherein information is stored in a compressed format for the purpose of gaining additional storage through compression efficiencies, a method and apparatus for providing compressed data integrity verification to insure detection of nearly any data corruption resulting from an anomaly anywhere in the logical processing or storage of compressed information. A cyclic redundancy code (CRC) is computed over a compressed data block as the data enters the compressor hardware, and the CRC is appended to the compressor output block before it is stored into the main memory. Subsequent read access results in comparing the CRC against a recomputation of the CRC as the block is uncompressed from the main memory. Any CRC miscompare implies an uncorrectable data error condition that may be used to interrupt the system operation.

Method and apparatus for high integrity hardware memory compression

In a processing system having a main memory wherein information is stored in a compressed format for the purpose of gaining additional storage through compression efficiencies, a method and apparatus for enabling termination of a pending compression operation for the purpose of writing the data directly to the main memory, bypassing the compressor hardware during stall conditions. Memory space (compressibility) is sacrificed for higher system performance during these temporary write back stall events. A background memory scrub later detects and recovers the &ldquo;lost&rdquo; compressibility by recycling the uncompressed data back through the compressor during idle periods.

Computer memory compression abort and bypass mechanism when cache write back buffer is full

A highly-efficient system and methodology for organizing, storing and/or transmitting compressed data that achieves optimum compression throughput, enhances overall data compressibility, and reduces decompression latency.

Highly-efficient compression data format

System and method for efficiently merging compressed data

In a high-speed computer system using multiple compression and decompression engines, a method and apparatus for coding and parsing compressed data in the decompressor in order to avoid bottlenecks within the decompressor that prevent it from achieving optimum latency and throughput acceptable to the system processor.

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David Har