Tomas Svensson wrote: | | Some OpenSSL-algorithms are slower on x64, like RSA. SHA1 and RC4 seem to | be faster [...]
Cases where an OpenSSL algorithm is slower on AMD64 than on i386 are almost always due to a substandard AMD64 implementation. For example, some algorithms are written using hand-coded assembly when compiled for i386, and a generic (slower) C language implementation when compiled for AMD64. Fortunately, such cases are becoming less and less common, as more and more algorithms are being optimized for AMD64 (for instance I contri- buted an assembly version of MD5 for AMD64, new in 0.9.8). But I think that more work is needed, as about 50% of the algorithms are still faster on i386. You said that RSA is slower on AMD64 ? This is unmistakably wrong, or at least, something must have gone terribly wrong during your benchmark. RSA heavily benefits from 64-bit arithmetic and by consequent AMD64 has a clear advantage over i386 (it is usually up to 3x faster). -- Marc Bevand http://epita.fr/~bevand_m Computer Science School EPITA - System, Network and Security Dept. ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List openssl-dev@openssl.org Automated List Manager [EMAIL PROTECTED]
