freebsd-performance Digest, Vol 3, Issue 11

David O'Brien obrien at
Thu May 22 10:56:32 PDT 2003

On Thu, May 22, 2003 at 09:14:45AM +0200, Pavel Kraynyukhov wrote:
> As far as i know HyperThreading is an Intel trademark and technologie as
> well.
> AMD has something similar for them processors, but i have no idea is such
> feature supported by FreeBSD for AMD processors.

I can tell you with upmost authority that AMD does not have something
like HyperThreading in its CPU's -- not even in K8.

> > I gotta question. I am contemplating buying the new AMD Opteron for a
> > newer FreeBSD server. I am certain because of it's x86 compatibility
> > running FBSD won't be a problem,

Nope, no problems:

FreeBSD 5.1-BETA #9: Thu May 22 09:20:08 GMT 2003
    root at

CPU: AuthenticAMD AMD64 Class Processor
  Origin = "AuthenticAMD"  Id = 0xf40  Stepping = 0
AMD Features=0xe0500000<<b20>,AMIE,<b29>,DSP,3DNow!>

# file /boot/kernel/kernel
/boot/kernel/kernel: ELF 64-bit LSB executable, AMD x86-64, version 1 (FreeBSD),
 dynamically linked (uses shared libs), not stripped

> > and I know that there is a 64Bit Apache
> > underways, but is there any 64 bit MySQL Server on the way? Or does MySQL
> > compile with that option? I am certain it can be built with Hyper
> > Threading, but can that help performance on a single 64 bit CPU? Please
> > help! (before I invest :-))

It will perform very well -- HyperThreading does is not the same as
having two real processors.  Some apps do perform better on a
HyperThreaded CPU, others don't.

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