Multiprocessor system VS one processor system

[Artem Koutchine]

> > of processes with short run periods you will get overal
> > perfomance somewhere near 5000Mhz. However, when i 
> > subsituted two 500Mhz CPUs with 1500Mhz one (even with
> > less 2nd level cache) on a heavy loaded web server i notice
> > that sites started to load faster. So, it seems as 
> > one 3X Mhz  CPU is faster that two X MHz CPUs, at least
> > for web server with sql base and many perl scripts.
> > 
> This is true as long there is no load until the CPU cache comes 
> into the game. It also depends on how the CPUs are connected to 
> the main memory.


Hm..
Let me make up  a case.
 Two boxes:
1) Dual CPU  X Mhz with Y KB of cache
2) Sinnge CPU with 2X Mhz and 2Y KB of cache

Which one is faster under FreeBSD? I think the
second one, because SMP overhead is gone.

Artem