Herbert Xu wrote:
On Wed, Mar 15, 2006 at 10:00:09PM +0100, Dag Arne Osvik wrote:

Using the best average encryption time per block from tcrypt's speed tests gave these numbers:

ECB on Intel    288.5
ECB on AMD      286.1

CBC on Intel    510.4
CBC on AMD      334.2

Sorry for the confusion.. All of these numbers are for code currently in the kernel. However, it seems like only ECB on Intel used the assembly version. With the asm module running also on the AMD machine, time for ECB on AMD dropped to 187.5 cycles per block, though CBC still runs at 334.2 per block.


Is the 187.5 figure with your code or the existing x86-64 asm module?
If it's the existing one, what are the figures above then?

187.5 is for the existing x86-64 asm module running on an AMD Athlon 64. None of the above numbers are for my code, since I haven't made a kernel module of it just yet, and hence can't report tcrypt testing results for it.

The only real news I'm presenting is that my code performs CBC-like encryption in about 233 cycles on a 64-bit Intel Celeron. Apart from that, I was very surprised that CBC-mode encryption in the kernel is so slow compared to ECB. The difference is really just four xor operations per block.


  Dag Arne

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