On 16/06/15 22:12, Andy Polyakov wrote: >>>> With some experimentation, it turns out that if I *stop* using the >>>> crypto/bn/asm/bn/armv4-mont.pl generated asm "optimised" version, the time >>>> for >>>> a simplish test to establish and close a simple SSL connection went from 28 >>>> seconds to 18. (It's quite a slow target at any time). >>>> >>>> In other words, this "optimised" version has slowed things down >>>> dramatically. >>>> Has anyone queried the value of the asm of armv4-mont.pl any time in the >>>> last >>>> few years? [snip]
Hi Andy, I found the cause - although OPENSSL_BN_ASM_MONT was defined, I hadn't noticed that a colleague had put a #define OPENSSL_NO_ASM somewhere else (this isn't linux but a port to our own OS). It turns out that (surprisingly) this combination changes behaviour rather than barfing - it's even explicitly catered for in bn_asm.c. Regardless, the effect is that a different bn_mul_mont implementation gets used, and the armv4-mont.pl implementation gets ignored entirely. With that fixed, I now have greatly improved performance as expected. An unfortunate waste of time for us both, but thanks for the assistance. Jifl -- ------["Si fractum non sit, noli id reficere"]------ Opinions==mine _______________________________________________ openssl-dev mailing list To unsubscribe: https://mta.openssl.org/mailman/listinfo/openssl-dev
