>> Comments on http://www.openssl.org/~appro/OPENSSL_instrument_bus/ are >> welcomed. > > I'd be more comfortable with this if I understood what physical process > might be generating the entropy.
I would be too:-) This is the reason why there is question mark in subject and "apparent"s and "if"s everywhere. I mean I'm not suggesting any answers, rather seeking for them... > But here, I think you're measuring the difference between two clocks that > are derived from the same oscillator. That is worrisome. Yes, it appears so. Working theory is that it's result of jitter in clock multiplier, which can be subject to fluctuations. On the other hand I should point out that there ought to be multiple factors in play. I'd argue that multiplier jitter can't explain presence of such high spikes. Is it kind of interference pattern with DRAM refresh? For example note the sometimes they are higher and sometimes lower [in this particular case], which surely has something to do memory chips being accessed in specific pattern as subroutine progresses through output vector, doesn't it? ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List openssl-dev@openssl.org Automated List Manager majord...@openssl.org
