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Radu Berinde 2f83f42554 crypto: limit md5 or sha256 blocks processed at once in assembly 
This change limits the amount of data that can be hashed at once - the
assembly routines are not preemptible and can result in large latency
outliers when part of a larger system.

Benchmarks for sha256 (on an arm64 M1):

name                  old speed      new speed      delta
Hash8Bytes/New-10      178MB/s ± 0%   178MB/s ± 0%  +0.16%  (p=0.002 n=9+8)
Hash8Bytes/Sum224-10   154MB/s ± 0%   154MB/s ± 0%    ~     (p=0.287 n=9+10)
Hash8Bytes/Sum256-10   156MB/s ± 0%   157MB/s ± 0%  +0.13%  (p=0.004 n=9+8)
Hash1K/New-10         2.28GB/s ± 0%  2.28GB/s ± 0%    ~     (p=0.968 n=10+9)
Hash1K/Sum224-10      2.20GB/s ± 0%  2.21GB/s ± 0%  +0.30%  (p=0.001 n=9+9)
Hash1K/Sum256-10      2.21GB/s ± 0%  2.21GB/s ± 0%  +0.26%  (p=0.000 n=9+8)
Hash8K/New-10         2.37GB/s ± 2%  2.40GB/s ± 0%    ~     (p=0.289 n=10+10)
Hash8K/Sum224-10      2.39GB/s ± 0%  2.39GB/s ± 0%    ~     (p=0.983 n=8+9)
Hash8K/Sum256-10      2.39GB/s ± 0%  2.39GB/s ± 0%    ~     (p=0.905 n=9+10)
Hash256K/New-10       2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.250 n=9+10)
Hash256K/Sum224-10    2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.093 n=8+9)
Hash256K/Sum256-10    2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.211 n=10+9)
Hash1M/New-10         2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.963 n=8+9)
Hash1M/Sum224-10      2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.173 n=10+8)
Hash1M/Sum256-10      2.42GB/s ± 0%  2.42GB/s ± 0%    ~     (p=0.743 n=9+8)

Note that `Hash8K` shows that a 8K block size is sufficient to achieve
peak bandwidth, so the 64KB maxAsmSize should be plenty.

Benchmarks for md5:

name       old speed     new speed     delta
Hash1M-10  669MB/s ± 0%  669MB/s ± 0%   ~     (p=0.965 n=8+10)
Hash8M-10  667MB/s ± 0%  666MB/s ± 0%   ~     (p=0.356 n=10+9)

Fixes #64417
 		2025-05-09 15:50:49 -07:00
.github .github: update language change proposal template 2024-08-08 19:02:29 +00:00
api log/slog: export Source method in Record for custom handler support 2025-05-06 03:58:07 -07:00
doc runtime: remove GODEBUG=runtimecontentionstacks 2025-05-07 12:22:24 -07:00
lib lib/time: build with Ubuntu backward compatibility options 2025-02-06 17:10:15 -08:00
misc misc/linkcheck: remove unused tool 2025-03-20 04:38:55 -07:00
src crypto: limit md5 or sha256 blocks processed at once in assembly 2025-05-09 15:50:49 -07:00
test cmd/compile: improve multiplication strength reduction 2025-05-01 09:33:31 -07:00
.gitattributes
…
.gitignore runtime,internal: move runtime/internal/sys to internal/runtime/sys 2024-07-23 19:05:35 +00:00
CONTRIBUTING.md doc: normalize proposal-process links 2023-03-29 22:00:27 +00:00
LICENSE LICENSE: update per Google Legal 2024-08-09 14:54:31 +00:00
PATENTS
…
README.md README: fix CC BY license name 2024-07-22 17:45:27 +00:00
SECURITY.md SECURITY.md: update the Reporting a Vulnerability link 2023-09-22 21:17:24 +00:00
codereview.cfg codereview.cfg: add codereview.cfg for master branch 2021-02-19 18:44:53 +00:00
go.env cmd/go: additional doc-inspired tests and bug fixes 2023-06-06 19:18:46 +00:00

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