On Wed, 1 Mar 2017, Conrad Meyer wrote:
On my laptop (Intel(R) Core(TM) i5-3320M CPU ??? Ivy Bridge) I still see a little worse performance with this patch. Please excuse the ugly graphs, I don't have a better graphing tool set up at this time:https://people.freebsd.org/~cem/crc32/sse42_bde.png https://people.freebsd.org/~cem/crc32/sse42_bde_log.png
Try doubling the loop sizes. There shouldn't be any significant difference above size 3*LONG unless LONG is too small. Apparently it is too small for older CPUs. I now have a Sandybridge i5-2xxx laptop to test on, but don't have it set up for much yet. Bruce
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