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 <[email protected]> Signed-off-by: Herbert Xu <[email protected]>
rtvt123 · Jun 5, 2013 · 3ef91f2 · 3ef91f2
1 parent de614e5
commit 3ef91f2
Showing 1 changed file with 1 addition and 0 deletions.
diff --git 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