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| author | LEROY Christophe <christophe.leroy@c-s.fr> | 2013-11-22 21:28:29 +0400 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-01-08 05:11:20 +0400 |
| commit | 189046981b0bb122cba1d1e559bbd69d0b128cb5 (patch) | |
| tree | 96ff4036ede482cf31bc6e524716f06dcf38f9ef /arch/powerpc/configs/mpc885_ads_defconfig | |
| parent | 8a6be2bdb608dec6b988d2b9a875a88f8b684bfb (diff) | |
| download | linux-189046981b0bb122cba1d1e559bbd69d0b128cb5.tar.xz | |
powerpc 8xx: defconfig: slice by 4 is more efficient than the default slice by 8 on Powerpc 8xx.
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.leroy@c-s.fr>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'arch/powerpc/configs/mpc885_ads_defconfig')
| -rw-r--r-- | arch/powerpc/configs/mpc885_ads_defconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/configs/mpc885_ads_defconfig b/arch/powerpc/configs/mpc885_ads_defconfig index 9e146cdf63de..3f47d00a10c0 100644 --- a/arch/powerpc/configs/mpc885_ads_defconfig +++ b/arch/powerpc/configs/mpc885_ads_defconfig @@ -78,3 +78,4 @@ CONFIG_DEBUG_KERNEL=y CONFIG_DETECT_HUNG_TASK=y CONFIG_DEBUG_INFO=y # CONFIG_RCU_CPU_STALL_DETECTOR is not set +CONFIG_CRC32_SLICEBY4=y |