Re: Scaling noise

[Valdis . Kletnieks]

On Wed, 03 Sep 2003 11:07:55 PDT, Larry McVoy <lm@xxxxxxxxxxxx>  said:
> On Wed, Sep 03, 2003 at 11:07:02AM -0700, William Lee Irwin III wrote:

> > You're thinking single-application again. Systems run more than one
> > thing at once.
> 
> Then explain why hyperthreading is turned off by default in Windows.

I haven't actually checked, but is it possible that the Windows HT support
suffers from the same scaling issues as the rest of the Windows innards?  To
tie  this in with what Mike Dell said - perhaps the reason he's selling mostly
1/2/4 CPU boxes is because the dominant operating system blows chunks with
more, and in the common desktop scenario enabling HT was actually slower than
leaving it off?

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