Re: [PATCH 1/3] Make /dev/urandom scalable

From: Theodore Ts'o
Date: Fri Sep 25 2015 - 16:24:45 EST

On Fri, Sep 25, 2015 at 03:07:54PM -0400, Austin S Hemmelgarn wrote:
> Interestingly, based on what dieharder is already saying about performance,
> /dev/urandom is slower than AES_OFB (at least, on this particular system,
> happy to provide hardware specs if someone wants).

Yeah, not surprised by that. We're currently using a crypto hash
instead of AES, which means we're not doing any kind of hardware

Crazy applications that want to spend 100% of the CPU generating
random numbers instead of you know, doing _useful_ work
notwithstanding, /dev/urandom never had high performance as one of its
design goals. The assumption was that if you needed that kind of
performance, you would use a user-space cryptographic random number

- Ted
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