RC4 Code Achieves 319 MB/s On AMD64 Opteron

Marc Bevand writes "This recent paper is about optimizing RC4 for AMD64 processors. A working implementation is provided. Its encryption/decryption throughput reaches 319 MB/s on a single AMD Opteron x44 processor running at 1.8 GHz. This makes it, as of today, the world's fastest RC4 symmetric cipher implementation for general purpose CPUs. As the author of this work, I would like to point out that many CPU-hungry applications have not been optimized for AMD64 yet. In other words: such speedups can be expected in other areas." An anonymous reader adds some figures for the old implementation: "Opteron 244 1.8 GHz (32-bit) 163 MB/s; Opteron 244 1.8 GHz (64-bit) 135 MB/s."

Comments

Re:Optimisation is definately the key

[Savage-Rabbit]

it will be like upgradingin for free :)

Just don't get too excited. One of my coworkers made this same discovery a while back. Now he runs around the office wearing an "I love Opteron" T-Shirt and starts shouting"Intel is history - Power PC is dead!" everytime somebody mentions the words Opteron or AMD in a sentence. Worst of all he attacks anybody who disagrees and tries to bite them. We tried to knock him out with a dart gun after he savaged a visiting IBM sales rep but even heavy duty veterinary tranqulisers don't seem to have any effect.

:-D