From 6dd7a82cc54ebd2936763befd3dcd4beb727a704 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Fri, 1 Jul 2016 08:19:45 +1000 Subject: 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 Signed-off-by: Herbert Xu --- crypto/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'crypto') 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 -- cgit v1.2.3-58-ga151