On Sun, Aug 27, 2017 at 8:59 PM, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> wrote: > > > On 08/27/2017 03:31 PM, Peter Robinson wrote: >> >> On Sun, Aug 27, 2017 at 6:57 PM, Robert Moskowitz <rgm@xxxxxxxxxxxxxxx> >> wrote: >>> >>> I use: >>> >>> cat /proc/sys/kernel/random/entropy_avail >>> >>> To check on the amount of entropy for creating random stuff like keypairs >>> with openssl or random nonces and keys for TLS.. >>> >>> I am using a Cubieboad2. >>> >>> With Fedora-Xfce-armhfp-26-1.5-sda.raw.xz I was seeing numbers in the >>> 3,000. >>> I don't have that image running right now to get an actual number. >>> >>> I just built a system with: Fedora-Server-armhfp-26-1.5-sda.raw.xz >>> >>> I am seeing numbers only in the mid 800s: >>> >>> [root@C2 ~]# cat /proc/sys/kernel/random/entropy_avail >>> 866 >>> [root@C2 ~]# cat /proc/sys/kernel/random/entropy_avail >>> 803 >>> [root@C2 ~]# cat /proc/sys/kernel/random/entropy_avail >>> 828 >>> >>> >>> What is different between these two images? It is the same Cubieboard. >> >> Different images have different services enabled by default, is >> rng-tools intsalled by default on server image? > > > Just checked and > > Package rng-tools-5-9.fc26.armv7hl is already installed > > And after running dnf, entropy dropped to 324.... > > > >> >>> I have also installed rng-tools with some success, but not as much as >>> haveged. >> >> There's a quality difference between HW rng vs haveged which provides >> entropy but might not be as random as a proper HW rng >> > I could boot up the workstation Xfce image I have, but I was kind of hoping > there was some knowledge here on differences. > > Other than workstation running something like haveged, what else could be > the source of the entropy difference? Different services consuming the available entropy _______________________________________________ arm mailing list -- arm@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to arm-leave@xxxxxxxxxxxxxxxxxxxxxxx
