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authorAnton Blanchard <anton@samba.org>2016-07-01 08:19:45 +1000
committerHerbert Xu <herbert@gondor.apana.org.au>2016-07-05 23:05:19 +0800
commit6dd7a82cc54ebd2936763befd3dcd4beb727a704 (patch)
tree4077ad30a801a6e7dcc0b915612e2c815239fd9b /crypto
parent151f25112ff7befc134ed3fc58b0ff8792b3169e (diff)
crypto: powerpc - Add POWER8 optimised crc32c
Use the vector polynomial multiply-sum instructions in POWER8 to speed up crc32c. This is just over 41x faster than the slice-by-8 method that it replaces. Measurements on a 4.1 GHz POWER8 show it sustaining 52 GiB/sec. A simple btrfs write performance test: dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096 sync is over 3.7x faster. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 62fcbb923753..a9377bef25e3 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -437,6 +437,17 @@ config CRYPTO_CRC32C_INTEL
gain performance compared with software implementation.
Module will be crc32c-intel.
+config CRYPT_CRC32C_VPMSUM
+ tristate "CRC32c CRC algorithm (powerpc64)"
+ depends on PPC64
+ select CRYPTO_HASH
+ select CRC32
+ help
+ CRC32c algorithm implemented using vector polynomial multiply-sum
+ (vpmsum) instructions, introduced in POWER8. Enable on POWER8
+ and newer processors for improved performance.
+
+
config CRYPTO_CRC32C_SPARC64
tristate "CRC32c CRC algorithm (SPARC64)"
depends on SPARC64

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