Re: Patch: cprng_fast performance - please review.

[Markku-Juhani Olavi Saarinen <mjos%iki.fi@localhost>]

Hi,

Just one last thought: it will be on all *future* systems ?

Cheers,
- markku

Dr. Markku-Juhani O. Saarinen <mjos%iki.fi@localhost>  US +1 (424) 666 2713


On Fri, Apr 18, 2014 at 11:00 PM, Thor Lancelot Simon <tls%panix.com@localhost> 
wrote:
> On Fri, Apr 18, 2014 at 09:54:09PM +0100, Roland C. Dowdeswell wrote:
>> On Fri, Apr 18, 2014 at 08:23:11PM +0200, Markku-Juhani Olavi Saarinen wrote:
>> >
>>
>> > Agreed. AES is worse if you don't have AES-NI.
>> >
>> > It has been there on all new systems purchased in some last 3 years,
>> > so I would *guess* that it would be > 50% of systems fielded out
>> > there.
>>
>> It hasn't been there on all new systems purchased in the last 3
>> years.  My laptop is about 3 years old and doesn't have AES-NI.
>> Neither does my file server (1.5 years old, AMD CPU, IIRC.) nor my
>> mobile phone, iPad, last year's MacBook Air, etc.
>
> So, I'm typing this on "last year's MacBook Air".  It does have AES-NI.
>
> Unfortunately, the virtual machines on this laptop that I use for most
> NetBSD development don't expose the AES-NI instructions to guests, even
> when doing hardware assisted virtualization.  Not RDRAND neither, for
> that matter.  And of course, this *is* NetBSD, so assuming all the world's
> this year's latest x86 model from a particular manufacturer is not the
> greatest idea, either...
>
> Thor