http://www.microsoft.com/windows2000/server/evaluation/performance/reports/hyperthread.asp has a link to an article that has the BIOS requirement for logical CPU numbering (and start-up order).
Note: since Windows 2000 Server does support up to four CPU's, the task manager does display 4 CPU's on a hyperthreaded dual XEON computer.
Have Fun :)
david hill wrote:
Yes Redhat Advanced Server 2.1 does support hyperthreading.
Its not to bad either. I ran some tests and we get about a 15% increase in performance with hyperthreading turned on.
-----Original Message----- From: Michael Brown [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 26, 2003 8:09 AM To: Multiple recipients of list ORACLE-L Subject: RE: Oracle Licences Req on Intel Xeon CPU
2000 only shows 2 CPUs because it cannot take advantage hyperthreading. From what I have read (Intel's website, some others), hyperthreading requires both BIOS and OS support to be utilized. Currently, XP and the newer Linux releases are all that I have seen that will take advantage of it.
My research on this was fairly light since I was just after can Redhat Advanced Server support it, but I do remember seeing that W2K would not.
-- Michael Brown Glen Raven, Inc./Info Services Senior Oracle DBA 1831 N. Park Ave Phone: (336)586-1146 Glen Raven, NC 27217 Fax: (336)586-1382 [EMAIL PROTECTED]
-----Original Message----- Sent: Wednesday, March 26, 2003 3:44 AM To: Multiple recipients of list ORACLE-L
Depending on the OS, Microsoft has different CPU counts. The Windows
2000 family
counts each hyper thread as 1 CPU. In contrast, Windows XP and Windows
2003 Server
count each CPU instead of each hyper thread. Thus, the task manager in
Windows XP
Professional show 4 CPU's (on a dual XEON CPU computer with hyper threading
enabled) while Windows 2000 Professional only shows 2 CPU's in the task
manager.
Have Fun :)
[EMAIL PROTECTED] wrote:
>Hi all
>
>For those that are running or intending on running Oracle on
>Intel's Xeon CPU, the following information may be of interest to you.
>
>The Xeon CPU has a feature called Hyper Threading with double the number
>of registers. This feature when turned will present to the Operating
>Systems an additional virtual CPU. As far as the O/S is concern, it
>looks like there are _two_ CPUs. What does this mean to your software
>licensing?
>
>Microsoft says that it is one CPU. What does Oracle say?
>
>Well, it depends on who you speak to and what day of the week it is.
>Seriously, you will need to get some confirmation in writing from your
>account manager the next time you purchase Oracle S/w for Intel's Xeon
>
>ta
>tony
>
> _____ ________ / ____|Tony Jambu, Database&Web Consultant
> /_ _ /_ __ / |Wizard Consulting Pty Ltd
> /(_)/ )(_/ \_/(///(/_)/_( |IOUG's Select Asia-Pacific Tech. Editor
> \_______/ |EMAIL: TJambu @ wizard.cx (REMOVE Spaces from
email )
>----------------------------|PHONE: +61-419-TJAMBU(852628)
>
>
>
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