On Thu, 9 Mar 2006, Lodewijk Vöge wrote:

> On 8-mrt-2006, at 23:11, Brian Hurt wrote:
>
>> Love to.  Wanna buy me the box?  :-}  Seriously- my code is attached, if 
>> someone wants to run it on other boxes and post the results, feel free. 
>> It's GNU-C/x86 specific, as I'm using GNU C's inline assembler and the 
>> rdtsc instruction to get accurate cycle counts.
>
> I don't know if rdtsc is accurate on 64bit, but this is what running it on a 
> dual opteron 250 running 64bit linux gives:

On 64-bit, I think rdtsc only sets the RAX register.  At least that's what 
I'm assuming is going on- 144 million clocks for a rdtsc seems a bit 
extreme.

Brian