powerpc 8xx: defconfig: slice by 4 is more efficient than the default slice by 8...
authorLEROY Christophe <christophe.leroy@c-s.fr>
Fri, 22 Nov 2013 17:28:29 +0000 (18:28 +0100)
committerScott Wood <scottwood@freescale.com>
Wed, 8 Jan 2014 01:11:20 +0000 (19:11 -0600)
commit189046981b0bb122cba1d1e559bbd69d0b128cb5
tree96ff4036ede482cf31bc6e524716f06dcf38f9ef
parent8a6be2bdb608dec6b988d2b9a875a88f8b684bfb
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>
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