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    SubjectRe: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64
    On 07/17/2014 12:59 AM, H. Peter Anvin wrote:
    > On 07/16/2014 03:40 PM, Andy Lutomirski wrote:
    >> On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski <luto@amacapital.net> wrote:
    >>> My personal preference is to defer this until some user shows up. I
    >>> think that even this would be too complicated for KASLR, which is the
    >>> only extremely early-boot user that I found.
    >>>
    >>> Hmm. Does the prandom stuff want to use this?
    >>
    >> prandom isn't even using rdrand. I'd suggest fixing this separately,
    >> or even just waiting until someone goes and deletes prandom.
    >
    > prandom is exactly the opposite; it is designed for when we need
    > possibly low quality random numbers very quickly. RDRAND is actually
    > too slow.

    Yep, prandom() is quite heavily used in the network stack where it's
    traded for speed.


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