On PPC_8xx, CRC32_SLICEBY4 is more efficient (almost twice) than CRC32_SLICEBY8, as shown below:
With CRC32_SLICEBY8: [ 1.109204] crc32: CRC_LE_BITS = 64, CRC_BE BITS = 64 [ 1.114401] crc32: self tests passed, processed 225944 bytes in 15118910 nsec [ 1.130655] crc32c: CRC_LE_BITS = 64 [ 1.134235] crc32c: self tests passed, processed 225944 bytes in 4479879 nsec With CRC32_SLICEBY4: [ 1.097129] crc32: CRC_LE_BITS = 32, CRC_BE BITS = 32 [ 1.101878] crc32: self tests passed, processed 225944 bytes in 8616242 nsec [ 1.116298] crc32c: CRC_LE_BITS = 32 [ 1.119607] crc32c: self tests passed, processed 225944 bytes in 3289576 nsec Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr> diff -ur a/arch/powerpc/configs/adder875_defconfig b/arch/powerpc/configs.new/adder875_defconfig --- a/arch/powerpc/configs/adder875_defconfig 2013-11-22 18:20:10.342968268 +0100 +++ b/arch/powerpc/configs.new/adder875_defconfig 2013-11-22 18:17:46.499686457 +0100 @@ -70,3 +70,4 @@ CONFIG_DETECT_HUNG_TASK=y CONFIG_DEBUG_INFO=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set +CONFIG_CRC32_SLICEBY4=y diff -ur a/arch/powerpc/configs/ep88xc_defconfig b/arch/powerpc/configs.new/ep88xc_defconfig --- a/arch/powerpc/configs/ep88xc_defconfig 2013-11-22 18:20:10.286961148 +0100 +++ b/arch/powerpc/configs.new/ep88xc_defconfig 2013-11-22 18:17:41.992113565 +0100 @@ -72,3 +72,4 @@ CONFIG_DETECT_HUNG_TASK=y CONFIG_DEBUG_INFO=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set +CONFIG_CRC32_SLICEBY4=y diff -ur a/arch/powerpc/configs/mpc866_ads_defconfig b/arch/powerpc/configs.new/mpc866_ads_defconfig --- a/arch/powerpc/configs/mpc866_ads_defconfig 2013-11-22 18:20:10.323965853 +0100 +++ b/arch/powerpc/configs.new/mpc866_ads_defconfig 2013-11-22 18:17:32.480904735 +0100 @@ -55,3 +55,4 @@ CONFIG_CRC_CCITT=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set # CONFIG_CRYPTO_ANSI_CPRNG is not set +CONFIG_CRC32_SLICEBY4=y diff -ur a/arch/powerpc/configs/mpc885_ads_defconfig b/arch/powerpc/configs.new/mpc885_ads_defconfig --- a/arch/powerpc/configs/mpc885_ads_defconfig 2013-11-22 18:20:10.326966235 +0100 +++ b/arch/powerpc/configs.new/mpc885_ads_defconfig 2013-11-22 18:17:25.760050546 +0100 @@ -78,3 +78,4 @@ CONFIG_DETECT_HUNG_TASK=y CONFIG_DEBUG_INFO=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set +CONFIG_CRC32_SLICEBY4=y diff -ur a/arch/powerpc/configs/tqm8xx_defconfig b/arch/powerpc/configs.new/tqm8xx_defconfig --- a/arch/powerpc/configs/tqm8xx_defconfig 2013-11-22 18:20:10.317965090 +0100 +++ b/arch/powerpc/configs.new/tqm8xx_defconfig 2013-11-22 18:17:14.926673681 +0100 @@ -84,3 +84,4 @@ CONFIG_DETECT_HUNG_TASK=y CONFIG_DEBUG_INFO=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set +CONFIG_CRC32_SLICEBY4=y -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
