I ran the tests on a graviton2 instance and saw the improvement as
expected/desired:
length | before (MiB/s) | after (MiB/s) | delta
----------|----------------|----------------|----------
32768 | 233.19 | 247.61 | 6.18%
65536 | 443.44 | 468.68 | 5.69%
131072 | 852.52 | 895.00 | 4.98%
262144 | 1630.48 | 1704.48 | 4.54%
524288 | 2480.18 | 2601.47 | 4.89%
1048576 | 3900.73 | 4112.08 | 5.42%
I'll try to get some people to test some other arm64 systems before
calling this verification-done though.
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https://bugs.launchpad.net/bugs/1951032
Title:
AArch64: Backport memcpy improvements
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