Re: Differences between AMD and Intel CPUs [was: Re: Dragonfly and Hyperthreading....]

[David Xu <davidxu@xxxxxxxx>]

EM1897@xxxxxxx wrote:

> If you paid that much for an SMP system running FreeBSD,
> then you're flying blind for certain. You've overpaid 
> because you don't know enough about hardware to know
> what you're doing. Your xeon systems "sound like jets"
> because you've bought something that sounds like a jet.
> A P4 system with a single blower (which is what we use)
> will likely outperform what you've bought for 1/5th the
> cost. (my current 5.3R benchmarks show that FreeBSD
> with 2 3.06Ghz xeons is actually slower than a single
> P4 processor system. They've done a helleva job!).

I wonder what benchmark you are running ? if you are
testing against libpthread, that might be the trouble.
I don't have a machine installed  5.3R, but with FreeBSD-CURRENT,
and libthread, the SMP performance is really increased, for example,
I have a test program from a book, the program recursivly searchs
a word concurrently in a directory by forking multiple threads,
on UP, it takes 11 seconds to complete, on SMP, it takes 7 seconds,
note that the machine is aged PIII SMP box, with a poor VIA 694T
chipset (can do SMP, but not performance wise).

David Xu