[Bug string/30994] REP MOVSB performance suffers from page aliasing on Zen 4

[bmerry at sarao dot ac.za]

https://sourceware.org/bugzilla/show_bug.cgi?id=30994

--- Comment #7 from Bruce Merry <bmerry at sarao dot ac.za> ---
Here's what I get on the Zen 4 system with the same parameters. I haven't had a
chance to look at what it all means:

+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 -r5
80.6649 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 2 4 6 8 10 12 14 16
18 20 22 -r5
954.928 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
1883.1 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 -r5
48.7753 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 2 4 6 8 10 12 14
16 18 20 22 -r5
570.385 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
676.928 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 -r5
3.54696 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 2 4 6 8 10 12 14 16
18 20 22 -r5
42.5706 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
85.0753 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 -r5
3.50689 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 2 4 6 8 10 12 14
16 18 20 22 -r5
41.5237 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
81.8951 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 -r5
102.05 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 2 4 6 8 10 12 14 16
18 20 22 -r5
1206.81 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
2415.47 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 -r5
49.4859 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 2 4 6 8 10 12 14
16 18 20 22 -r5
583.279 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 0 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
1066.54 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 -r5
97.1753 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 2 4 6 8 10 12 14 16
18 20 22 -r5
991.128 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 2113 -p 100000 -D 15 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
2257.42 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 -r5
49.3362 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 2 4 6 8 10 12 14
16 18 20 22 -r5
571.026 GB/s
+ ./memcpy_loop -t mmap -f memcpy -b 524287 -p 100000 -D 15 0 1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 -r5
1075.03 GB/s

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