crypto: twofish - disable AVX2 implementation

It appears that the performance of 'vpgatherdd' is suboptimal for this kind of
workload (tested on Core i5-4570) and causes twofish_avx2 to be significantly
slower than twofish_avx. So disable the AVX2 implementation to avoid
performance regressions.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 622d8a48cbe9cd5861701320b7a83ec78c4428c8..27720af741b4b9778ce9d1d7273daea188161b01 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1299,6 +1299,7 @@ config CRYPTO_TWOFISH_AVX_X86_64
 config CRYPTO_TWOFISH_AVX2_X86_64
        tristate "Twofish cipher algorithm (x86_64/AVX2)"
        depends on X86 && 64BIT
+       depends on BROKEN
        select CRYPTO_ALGAPI
        select CRYPTO_CRYPTD
        select CRYPTO_ABLK_HELPER_X86