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| author | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2013-06-02 19:51:47 +0300 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2013-06-05 16:33:22 +0800 |
| commit | 3ef91f21a66826cf1003bb7b3c51ac2de4c28182 (patch) | |
| tree | 70196d4c039d76131a86ca9e41d66ee1ad5d8262 | |
| parent | de614e561b9c633073caae8f86399aa8923ef85d (diff) | |
| download | lwn-3ef91f21a66826cf1003bb7b3c51ac2de4c28182.tar.gz lwn-3ef91f21a66826cf1003bb7b3c51ac2de4c28182.zip | |
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>
| -rw-r--r-- | crypto/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/crypto/Kconfig b/crypto/Kconfig index 622d8a48cbe9..27720af741b4 100644 --- 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 |