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btrfs-progs: docs: recalculate checksumming performance

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There are new backends and builtin accelerated implementations.
Recalculate the table results, a different host than before, with SHANI
extension.

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Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-01-18 03:41:13 +01:00
parent 152cd4de97
commit 42f98fcc88
1 changed files with 19 additions and 12 deletions
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31
Documentation/ch-checksumming.rst
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@ -34,20 +34,27 @@ there's no increase. Each data block has a separate checksum stored, with
additional overhead of the b-tree leaves.
Approximate relative performance of the algorithms, measured against CRC32C
using reference software implementations on a 3.5GHz intel CPU:
using implementations on a 11th gen 3.6GHz intel CPU:
======== ============ ======= ================
======== ============ ======= ================================
Digest Cycles/4KiB Ratio Implementation
======== ============ ======= ================
CRC32C 1700 1.00 CPU instruction
XXHASH 2500 1.44 reference impl.
SHA256 105000 61 reference impl.
SHA256 36000 21 libgcrypt/AVX2
SHA256 63000 37 libsodium/AVX2
BLAKE2b 22000 13 reference impl.
BLAKE2b 19000 11 libgcrypt/AVX2
BLAKE2b 19000 11 libsodium/AVX2
======== ============ ======= ================
======== ============ ======= ================================
CRC32C 470 1.00 CPU instruction, PCL combination
XXHASH 870 1.9 reference impl.
SHA256 7600 16 libgcrypt
SHA256 8500 18 openssl
SHA256 8700 18 botan
SHA256 32000 68 builtin, CPU instruction
SHA256 37000 78 libsodium
SHA256 78000 166 builtin, reference impl.
BLAKE2b 10000 21 builtin/AVX2
BLAKE2b 10900 23 libgcrypt
BLAKE2b 13500 29 builtin/SSE41
BLAKE2b 13700 29 libsodium
BLAKE2b 14100 30 openssl
BLAKE2b 14500 31 kcapi
BLAKE2b 14500 34 builtin, reference impl.
======== ============ ======= ================================
Many kernels are configured with SHA256 as built-in and not as a module.
The accelerated versions are however provided by the modules and must be loaded