Low random entropy

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I am use to low random entropy on my arm boards, not an intel.

On my Lenovo x120e,

cat /proc/sys/kernel/random/entropy_avail

reports 3190 bits of entropy.

On my armv7 with Centos7 I would get 130 unless I installed rng-tools and then I get ~1300. SSH into one and it drops back to 30! for a few minutes. Sigh.

Anyway on my new Zotac nano ad12 with an AMD E-1800 duo core, I am seeing 180.

I installed rng-tools and no change. Does anyone here know how to improve the random entropy?

thanks

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