On Feb 9, 2006, at 11:10, Ben Scott wrote:
Unfortunately, that's not really much help. First of all, clock rates are a really poor way to compare CPUs of different architectures.
If you have straight integer code (Rijndael is all table lookups, shifts, and XOR's) and the CPU's are of similar architectures (scalar-type, bits, dispatch types), in the same price category (affects caches and such) typically clock speed is proportional to performance, well within an order of magnitude, despite the flavor of instructions. In the case of MIPS32 (WRT54G) and StrongARM (Sonicwall) Rijndael runs in 730 and 690 clocks respectively, so pretty close. Of course, a Cell processor will do it in under a hundred, so it's all a matter of context.
More importantly, a lot of VPN appliances use ASICs that off-load the crypto from the CPU. The WRT54G has no such accelerator. So you're comparing apples to orange juice. :)
You're right - the Sonicwall does have a VPN ASIC to offload VPN processing, so it's at least apples to Sunny Delight, maybe artificially-flavored orange Pez.
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