Re: RND_TYPE_RNG question concerning rate of random bits production

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Wed, Jan 15, 2014 at 05:26:34PM -0600, Frank Zerangue wrote:
> I am writing a driver for an arm random number generator accelerator to 
> provide a source of random bits to rnd_pool.
> 
> How does one know at what rate to supply random bits to the pool using 
> rnd_add_data()? Assume for a moment that more bits/sec can be generated than 
> are needed, what criteria should be used to decide the rate to provide bits 
> to the pool? Is there any feedback mechanism that can be used to govern the 
> flow?

You can arrange to be polled for entropy when it's needed.  Have a look
at the hifn, amdpm, or bcm2835 RNG drivers.

Thor