[RC5] run rc564 and rc5des?

Jim C. Nasby nasby at enteract.com
Wed Jan 14 21:03:55 EST 1998


> "Jim C. Nasby" <nasby at enteract.com> said
> >Well, I did some calculations yesterday on RC5:
> >Assume:
> >Key rate increase for DES clients is 4x (conservative)
> I don't even get double the RC5 key rate on my PPro 200s. This is the key
> rate
> after cracking overnight (mostly idle machines.)


> Should I really be seeing 4x keyrates ?

On a PC client, no. 4x was the _average_ from what I heard on IRC. From 
I've been told, the Sun's do 10x, other RISC cpu's fair similarly. 
that RC5 requires a barrel roll to the left, and many CPU's don't have an
explicit instruction to perform that. Those CPUs do horribly at RC5, but 
kick ass at DES ... :)



          /^\            Jim C. Nasby (aka Decibel!)
        /     \          nasbjim at charlie.acc.iit.edu
      /----+----\        Freelance lighting designer and database 
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   +-------+-------+     Sports Car Club of America, Triangle Fraternity

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