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| author | Anton Blanchard <anton@samba.org> | 2016-07-01 08:19:45 +1000 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2016-07-05 23:05:19 +0800 |
| commit | 6dd7a82cc54ebd2936763befd3dcd4beb727a704 (patch) | |
| tree | 4077ad30a801a6e7dcc0b915612e2c815239fd9b /crypto | |
| parent | 151f25112ff7befc134ed3fc58b0ff8792b3169e (diff) | |
| download | linux-stable-6dd7a82cc54ebd2936763befd3dcd4beb727a704.tar.gz linux-stable-6dd7a82cc54ebd2936763befd3dcd4beb727a704.tar.bz2 linux-stable-6dd7a82cc54ebd2936763befd3dcd4beb727a704.zip | |
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/Kconfig | 11 |
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 |