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It turns out that "do LZ4 and zstd-1 both fail" is a great heuristic for "don't even bother trying higher zstd tiers". By way of illustration: $ cat /incompress | mbuffer | zfs recv -o compression=zstd-12 evenfaster/lowcomp_1M_zstd12_normal summary: 39.8 GiByte in 3min 40.2sec - average of 185 MiB/s $ echo 3 | sudo tee /sys/module/zzstd/parameters/zstd_lz4_pass 3 $ cat /incompress | mbuffer -m 4G | zfs recv -o compression=zstd-12 evenfaster/lowcomp_1M_zstd12_patched summary: 39.8 GiByte in 48.6sec - average of 839 MiB/s $ sudo zfs list -p -o name,used,lused,ratio evenfaster/lowcomp_1M_zstd12_normal evenfaster/lowcomp_1M_zstd12_patched NAME USED LUSED RATIO evenfaster/lowcomp_1M_zstd12_normal 39549931520 42721221632 1.08 evenfaster/lowcomp_1M_zstd12_patched 39626399744 42721217536 1.07 $ python3 -c "print(39626399744 - 39549931520)" 76468224 $ I'll take 76 MB out of 42 GB for > 4x speedup. Reviewed-by: Allan Jude <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: George Melikov <[email protected]> Reviewed-by: Kjeld Schouten <[email protected]> Reviewed-by: Ahelenia Ziemiańska <[email protected]> Signed-off-by: Rich Ercolani <[email protected]> Closes openzfs#13244
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