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Subject: Re: SURPRISING RESULTS P4 Xeon dual 2.8Ghz

Author: Gian-Carlo Pascutto

Date: 08:40:37 12/17/02

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On December 17, 2002 at 10:31:02, Robert Hyatt wrote:

>It doesn't necessarily get slower.  And once you move to windows .new, or
>the new linux kernel gets fixed, this won't happen at all as both of these
>systems will understand that two threads need to run on two physical processors
>rather than on two logical processors on the same physical processor...
>
>what is your point?  This is a sudden revellation to you?  :)

Yes. The thing is, Microsoft is _specifically_ advertising Windows XP
(which was used for this test) as 'HyperThreading optimized'.

This test shows that that should be taken with a few mountains
of salt, considering the OS cannot even schedule correctly!

This means that _right now_, there are severe issues with HT
on a dual system. And they won't be resolved until a next generation
of OS comes out.

--
GCP



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