Re: [dpdk-dev] [PATCH v4 0/6] update jhash function

[Neil Horman <nhorman@tuxdriver.com>]

On Tue, May 12, 2015 at 12:02:32PM +0100, Pablo de Lara wrote:
> 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 60% 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.
> 
> 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
> 
> Pablo de Lara (6):
>   test/hash: move hash function perf tests to separate file
>   test/hash: improve accuracy on cycle measurements
>   hash: update jhash function with the latest available
>   hash: add two new functions to jhash library
>   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_func_perf.c  |  145 +++++++++++++++++
>  app/test/test_hash_perf.c       |   71 +--------
>  lib/librte_hash/rte_jhash.h     |  338 +++++++++++++++++++++++++++++----------
>  6 files changed, 402 insertions(+), 159 deletions(-)
>  create mode 100644 app/test/test_hash_func_perf.c
> 
> -- 
> 1.7.4.1
> 
> 
did you run this through the ABI checker?  I see you're removing several symbols
that will likely need to go through the ABI deprecation process.

Neil