> [email protected] wrote (18 Dec 2012 22:18:28 GMT) : >>> Hi, >>> >>> adrelanos wrote (16 Dec 2012 18:19:44 GMT) : >>>> - Do they block each other or result in even more entropy available? >>>> [...] >>>> haveged only ~1100 and ~4000 >>>> randomsound and haveged ~1100 and ~4000 >>> >>> Isn't this capped by /proc/sys/kernel/random/poolsize ? > >> No. >> https://www.kernel.org/doc/man-pages/online/pages/man4/random.4.html > > Thanks. > > The read-only file entropy_avail gives the available entropy. > Normally, this will be 4096 (bits), a full entropy pool. > > The file poolsize gives the size of the entropy pool. > The semantics of this file vary across kernel versions: > [...] > Linux 2.6: This file is read-only, and gives the size of > the entropy > pool in bits. It contains the value 4096. > > I admit I've not checked the code, but in my understanding of this > documentation, it confirms the available entropy is capped by the > entropy pool size.
cat /proc/sys/kernel/random/poolsize is always 4096. Unusable for benchmarking. cat /proc/sys/kernel/random/entropy_avail numbers always change. Depends on hardware (real or virtual). Also depending on which entropy related packages are installed they change even more. I didn't check the kernel sources either, but this is backed up by practical tests and instructions on how to benchmark it everywhere. There is a consensus. http://manyrootsofallevilrants.blogspot.co.at/2011/06/rng-utils-and-entropy-rhel6-style.html http://pthree.org/2012/09/14/haveged-a-true-random-number-generator/ _______________________________________________ tails-dev mailing list [email protected] https://mailman.boum.org/listinfo/tails-dev
