And Jake Oshins mentioned this here on this list a while back.
=====================
Mark Roddy
-----Original Message-----
From: Russ Poffenberger [mailto:xxxxx@nptest.com]
Sent: Tuesday, October 28, 2003 9:50 AM
To: Windows System Software Devs Interest List
Cc: xxxxx@inakicastillo.com
Subject: [ntdev] Re: Strange performance results on
hyperthreading systemAt 02:52 PM 10/28/2003 +0100, Inaki Castillo wrote:
>I have been checking a driver on a Hyperthreading machine
(one physical
>CPU) and have found the following strange results:
>
>- The best performance of my driver is achieved when I disable
>HyperThreading from BIOS (that is, no hyperthreding at all)
>- Second best is when I use the flag /ONECPU in BOOT.INI.
>- The worst, by far, is when I use HypertHreading and two
logical CPUs.You don’t mention which OS this is on, but I did come across
an article on
the MS web site a while back that mentions that HT is only properly
supported in XP and later (I assume this means 2003 server).
They recommend
turning it off on all previous OS’s (including W2K).Russ Poffenberger
NPTest, Inc.
xxxxx@NPTest.com
Questions? First check the Kernel Driver FAQ at
http://www.osronline.com/article.cfm?id=256
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