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> that by repeating reading (as a user) I should be able to
> get the inter-IRQ timing down to a few tens of microseconds,

& (as per add_timer_randomness) on all non-i386's and some
i386's, I actually only need to get the time within one jiffy.
Do this on 4 successive IRQ's, and that's 12 bits of 'false'
entropy. But the point is, it's no worse for network than
for the rest.

Alex Bligh
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