54d7de7dd6
The algorithm is explained in the comments. The improvement in throughput is about 1.4x for buffers between 500b-4Kb and 2.5x-2.6x for larger buffers. Additionally, we no longer initialize the software tables if SSE4.2 is available. Benchmarks on a Haswell i5-4670 @ 3.4 GHz: name old time/op new time/op delta CastagnoliCrc15B-4 21.9ns ± 1% 22.9ns ± 0% +4.45% CastagnoliCrc15BMisaligned-4 22.6ns ± 0% 23.4ns ± 0% +3.43% CastagnoliCrc40B-4 23.3ns ± 0% 23.9ns ± 0% +2.58% CastagnoliCrc40BMisaligned-4 25.4ns ± 0% 26.1ns ± 0% +2.86% CastagnoliCrc512-4 72.6ns ± 0% 52.8ns ± 0% -27.33% CastagnoliCrc512Misaligned-4 76.3ns ± 1% 56.3ns ± 0% -26.18% CastagnoliCrc1KB-4 128ns ± 1% 89ns ± 0% -30.04% CastagnoliCrc1KBMisaligned-4 130ns ± 0% 88ns ± 0% -32.65% CastagnoliCrc4KB-4 461ns ± 0% 187ns ± 0% -59.40% CastagnoliCrc4KBMisaligned-4 463ns ± 0% 191ns ± 0% -58.77% CastagnoliCrc32KB-4 3.58µs ± 0% 1.35µs ± 0% -62.22% CastagnoliCrc32KBMisaligned-4 3.58µs ± 0% 1.36µs ± 0% -61.84% name old speed new speed delta CastagnoliCrc15B-4 684MB/s ± 1% 655MB/s ± 0% -4.32% CastagnoliCrc15BMisaligned-4 663MB/s ± 0% 641MB/s ± 0% -3.32% CastagnoliCrc40B-4 1.72GB/s ± 0% 1.67GB/s ± 0% -2.69% CastagnoliCrc40BMisaligned-4 1.58GB/s ± 0% 1.53GB/s ± 0% -2.82% CastagnoliCrc512-4 7.05GB/s ± 0% 9.70GB/s ± 0% +37.59% CastagnoliCrc512Misaligned-4 6.71GB/s ± 1% 9.09GB/s ± 0% +35.43% CastagnoliCrc1KB-4 7.98GB/s ± 1% 11.46GB/s ± 0% +43.55% CastagnoliCrc1KBMisaligned-4 7.86GB/s ± 0% 11.70GB/s ± 0% +48.75% CastagnoliCrc4KB-4 8.87GB/s ± 0% 21.80GB/s ± 0% +145.69% CastagnoliCrc4KBMisaligned-4 8.83GB/s ± 0% 21.39GB/s ± 0% +142.25% CastagnoliCrc32KB-4 9.15GB/s ± 0% 24.22GB/s ± 0% +164.62% CastagnoliCrc32KBMisaligned-4 9.16GB/s ± 0% 24.00GB/s ± 0% +161.94% Fixes #16107. Change-Id: I8fa827ec03f708ba27ee71c833f7544ad9dc5bc3 Reviewed-on: https://go-review.googlesource.com/24471 Reviewed-by: Keith Randall <khr@golang.org> |
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