On Fri, Sep 04, 2009 at 04:56:21PM +0100, Richard Smith wrote:
> Within my UML guest kernel, I'm finding that between 5% and
> 10% of reads from /dev/hwrng block, seemingly indefinitely.
> (I've certainly seem reads block for more than 12 hours.)
> All other reads complete in significantly less than 1
> second.
Make sure that the host has entropy. hwrng relies on that, and will
block until the host can fork over some bits.
> I.e. we appear to be blocking in the host
> kernel. My obvious first thought is that the host kernel's
> entropy is depleted, although it seems hard to believe that
> this could explain the guest blocking for 12+ hours.
>
> The host is running rngd which seems to be effective at
> preventing the UML guests from depleting the host kernel's
> entropy pool. If I monitor the available host entropy, I
> see:
Can you actually dd bits out of the host's /dev/random?
Jeff
--
Work email - jdike at linux dot intel dot com
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