> On 23 Jul 2015, at 08:59, Jeff Roberson <jrober...@jroberson.net> wrote: > >> >> OK - I?m sold! I?ll make a kernel option defaulting to off. :-) > > There are other sources that occur less frequently than millions of times > per-second that may still provide some usefull entropy while being less > performance critical under normal conditions.
I’m sure there are, and I’m keen to discover more! I’m not exactly the worlds best kernel hacker, so I’ll be requesting help. My own crappy benchmark is “make world” and for that, I notice very little. For Video at Ludicrous Speed(™), I’m well prepared to accept otherwise! For crypto purposes, UMA is brilliant, though (but that won’t stop me defaulting it to “compiled out”). > For example, context switches, traps, etc. I could also imagine wiring up a > pmc counter to something like cache misses or branch mispredicts that would > be more difficult to game, especially if the counter was cycled irregularly. Help requested here, please! If you could point out suitable harvesting points, I’ll see if the numbers from them look good. Thanks! M -- Mark R V Murray _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
