Hi, ISA-L needs to define the macro to enable AVX512 feature: HAVE_AS_KNOWS_AVX512 And, according to this: https://lists.01.org/pipermail/isal/2017-November/000022.html It seems that only NASM supports avx512. Besides, I have one more question, do it need 64-byte alignment of buffer in ceph? Yufan Chen -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html