[dpdk-dev] [PATCH v6 00/10] update jhash function
Pablo de Lara
pablo.de.lara.guarch at intel.com
Wed Jun 10 17:25:17 CEST 2015
Jenkins hash function was developed originally in 1996,
and was integrated in first versions of DPDK.
The function has been improved in 2006,
achieving up to 35% better performance, compared to the original one.
This patchset updates the current jhash in DPDK,
including two new functions that generate two hashes from a single key.
It also separates the existing hash function performance tests to
another file, to make it quicker to run, and add new unit tests.
changes in v6:
- Use RTE_DIM macro, so it saves lines of code
- Correct mistaken performance improvement
- Add deprecated attribute, instead of printing a message calling it
- Add note stating the changes in release notes
changes in v5:
- Add functional tests (mainly to test that all functions
return the expected hash values)
- Modify range of key sizes to test
- Change order of output for perf tests, so it is clearer
to compare different hash functions for same key size/initial value
- Add new initial value to test in the hash functions
- Fix some errors caught by checkpatch
changes in v4:
- Simplify key alignment checks
- Include missing x86 arch check
changes in v3:
- Update rte_jhash_1word, rte_jhash_2words and rte_jhash_3words
functions
changes in v2:
- Split single commit in three commits, one that updates the existing functions
and another that adds two new functions and use one of those functions
as a base to be called by the other ones.
- Remove some unnecessary ifdefs in the code.
- Add new macros to help on the reutilization of constants
- Separate hash function performance tests to another file
and improve cycle measurements.
- Rename existing function rte_jhash2 to rte_jhash_32b
(something more meaninful) and mark rte_jhash2 as
deprecated
De Lara Guarch, Pablo (6):
test/hash: move hash function perf tests to separate file
test/hash: improve accuracy on cycle measurements
test/hash: update key size range and initial values for testing
test/hash: add new functional tests for hash functions
hash: add two new functions to jhash library
test/hash: verify rte_jhash_1word/2words/3words
test/hash: change order of loops in hash function tests
hash: update jhash function with the latest available
hash: remove duplicated code
hash: rename rte_jhash2 to rte_jhash_32b
app/test/Makefile | 1 +
app/test/test_func_reentrancy.c | 2 +-
app/test/test_hash.c | 4 +-
app/test/test_hash_functions.c | 321 ++++++++++++++++++++++++++++++++
app/test/test_hash_perf.c | 71 +------
doc/guides/rel_notes/new_features.rst | 5 +
lib/librte_hash/rte_jhash.h | 339 +++++++++++++++++++++++++---------
7 files changed, 584 insertions(+), 159 deletions(-)
create mode 100644 app/test/test_hash_functions.c
--
2.4.2
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