Apparatus and method for single pass entropy detection on data transfer
First Claim
1. An apparatus comprising:
- a memory unit configured to store an input data stream; and
a processor coupled to said memory unit, said processor configured to;
compute a hash value for a subset of data of said input data stream;
compare the hash value computed for the subset of data of said input data stream with a stored hash value in a hash table;
update a counter value if the hash value matches the stored hash value;
determine, based on the counter value, an entropy level for the subset of data of said input data stream, and perform a data reduction operation responsive to said entropy level.
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Accused Products
Abstract
Embodiments of the present invention include a memory unit and a processor coupled to a memory unit. The processor is operable to group a plurality of subsets of data from an input data stream and compute a first hash value corresponding to a first grouped subset of data. Additionally, the processor is operable to detect a match between the first hash value and a second hash value stored in a hash table. Furthermore, the processor is also configured to monitor a hash value match frequency for the input data stream in which the processor is operable to increment a counter value responsive to a detection of the match and determine an entropy level for the input data stream based on the counter value relative to a frequent hash value match threshold. The processor can generate an instruction to either initialize performance of a data compression operation when the counter value meets or exceeds the frequent hash value match threshold or refrain from the performance of the data compression operation when the counter value fails to meet the frequent hash value match threshold.
46 Citations
19 Claims
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1. An apparatus comprising:
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a memory unit configured to store an input data stream; and a processor coupled to said memory unit, said processor configured to; compute a hash value for a subset of data of said input data stream; compare the hash value computed for the subset of data of said input data stream with a stored hash value in a hash table; update a counter value if the hash value matches the stored hash value; determine, based on the counter value, an entropy level for the subset of data of said input data stream, and perform a data reduction operation responsive to said entropy level. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-implemented method to detect entropy of an input data stream, said method comprising:
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receiving an input data stream; computing a hash value for a subset of data of said input data stream; comparing the hash value computed for the subset of data of said input data stream with a stored hash value in a hash table; updating a counter value if the hash value matches the stored hash value; determining, based on the counter value, an entropy level for the subset of data of said input data stream; and performing a data reduction operation responsive to said entropy level. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a processor; a memory storing sequences of instructions, which when executed by the processor, causes the processor to perform; storing an input data stream; computing a hash value for a subset of data of said input data stream; comparing the hash value computed for the subset of data of said input data stream with a stored hash value in a hash table; updating a counter value if the hash value matches the stored hash value; and determining, based on the counter value, an entropy level for the subset of data of said input data stream and performing a data reduction operation responsive to said entropy level. - View Dependent Claims (16, 17, 18, 19)
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Specification