Andrew Hammond wrote:
On 2/7/07, Nicole Harrington <[EMAIL PROTECTED]> wrote:
Hello all,
I have been building/using servers that were dual CPU
AMD Opteron systems for some time. (usually 246
Opteron cpu's)
Now of course the world is shifting to Dual Core.
Using FreeBSD, what is really the difference, besides
power and ability to shove in more memory, between
having the two seperate CPUS's?
Well, you also have two additional HT buses for memory access. And one
additional HT bus for peripheral access although most motherboard
manufacturers don't actually do anything with it.
What if I did 2, Dual Core cpu's? Would the SMP
overhead and sharing to a [Giant Locked] disk and or
network erase any benefits?
Benefits to what? Your computer can idle quite effectively with a 386
processor while consuming less power, producing less heat and
requiring much less capital outlay than any Opteron box.
I'm not sure where you got that info, but for the Pentium processor line
at least, you're MUCH better off getting a Core Duo compared to the
Pentium 4 HT enabled equivalent.
Intel's power system (at least at the hardware level) is pretty good
about shutting down cores when not in use, and actually it's better
power wise to get a dual core processor compared to a dual processor
machine, since on a dual processor machine both processors are fired up
at the same time.
Besides, with dual cores it's a shorter path electrically core to core,
compared to a processor. The only OS that actually performs better with
a dual single core processor setup compared to a single dual core
processor would be Mac OSX (believe it or not). But that's because they
use a mach kernel instead of a monolithic kernel like FreeBSD, Linux,
and Windows.
Look up previous discussions on this list for the mach kernel and OSX if
you're curious, or just look up the article on wikipedia.
-Garrett
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