[OpenWrt-Devel] Relatively insane getrandom blocking times on ARM/i.MX6 [Was: Re: [PATCH] openssl: Fix longer booting times by unblocking getrandom]

[Rosen Penev]

On Sat, Mar 23, 2019 at 3:16 PM Petr Štetiar <ynezz at true.cz> wrote:
>
> Few more real world issues.
>
> From FS#2202:
>
>  brcm63xx HG556a
>
>   [    1.034043] random: fast init done
>   [   53.820705] random: crng init done
>
> From FS#1951:
>
>  brcm63xx Livebox
>
>   [    1.037346] random: fast init done
>   [   53.974911] random: crng init done
>
> There's another reported issue with blocking getrandom on mvebu/armada38x
> (Turris Omnia) in FS#1979 as well, but it's missing both numbers, just the
> time for fast init:
>
>   [    7.125280] random: fast init done
>   [    ???     ] random: crng init done (I don't have this number yet)
[    2.919314] random: fast init done
[   21.845592] random: crng init done
on mine. Note that this is on kernel 4.19.

kernel 4.19 is really good for mvebu. There were a bunch of
improvements for the ethernet to deal with the low memory of the
Linksys devices (256MB) and to speed it up.
>
> I think, that in this case the entropy is being exhausted by unbound and thus
> preventing crng init forever.
>
> -- ynezz
>
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