Re: [PATCH RFC v4 1/1] random: WARN on large getrandom() waits and introduce getrandom2()

Theodore Y. Ts'o
2019-09-20T13:16:20Z

On Fri, Sep 20, 2019 at 03:23:58AM +0500, Alexander E. Patrakov wrote:
> OTOH, I thought that at least part of the real entropy, if it exists, comes
> from the interference of the CPU's memory accesses with the refresh cycles
> that are clocked from an independent oscillator.

That's not a valid assumption; on *many* systems, there is only a
single master oscillator. It saves on power, parts cost, reduces the
amount of RF interference, etc.

- Ted