[THIN] Re: OT?: HyperThreading

Windows 2000 Server does not distinguish between physical and logical
processors on systems enabled with Hyper-Threading Technology; Windows 2000
simply fills out the license limit using the first processors counted by the
BIOS. For example, when you launch Windows 2000 Server (4-CPU limit) on a
four-way system enabled with Hyper-Threading Technology, Windows will use
the first logical processor on each of the four physical processors, as
shown in Figure 2; the second logical processor on each physical processor
will be unused, because of the 4-CPU license limit. (This assumes the BIOS
was written according to Intel specifications. Windows uses the processor
count and sequence indicated by the BIOS.)  
When examining the processor count provided by the BIOS, Windows .NET Server
distinguishes between logical and physical processors, regardless of how
they are counted by the BIOS. This provides a powerful advantage over
Windows 2000, in that Windows .NET Server only treats physical processors as
counting against the license limit. 

(Source:http://www.microsoft.com/windows2000/docs/hyperthreading.doc)


-----Original Message-----
From: Brad Crooks [mailto:tealblazer@xxxxxxxxxxx] 
Sent: Wednesday, June 04, 2003 4:19 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT?: HyperThreading


The only one missing is Embedded 2000.

ALL versions do not have the code to distingusih between logical and 
physical processors.    Plus there is a shorter wait state in W3K that makes

the process switching out the processes faster.


----Original Message Follows----
From: "Ryan Lambert" <rlambert@xxxxxxxxxxxxxxx>
Reply-To: thin@xxxxxxxxxxxxx
To: <thin@xxxxxxxxxxxxx>
Subject: [THIN] Re: OT?:  HyperThreading
Date: Wed, 4 Jun 2003 17:00:34 -0400

Advanced Server, Datacenter Server are *technically* different versions.
Different support for processing and memory.

-----Original Message-----
From: Ron Oglesby [mailto:roglesby@xxxxxxxxxxxx]=20
Sent: Wednesday, June 04, 2003 4:44 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT?: HyperThreading

Notice it does say Windows 2000 (All Versions) uh, there is only Pro and
Server versions. So why note ALL Versions

Its not like XP with Pro and Home. So all versions would seem to mean Server
and Pro.  Unless you know of any more 2k versions that are hiding out.

Ron Oglesby
Senior Technical Architect
=3D20
RapidApp
Office 312.372.7188
Mobile 815.325.7618
email roglesby@xxxxxxxxxxxx
=3D20

-----Original Message-----
From: Tim Mangan [mailto:tmangan@xxxxxxxxxxxx]=3D20
Sent: Tuesday, June 03, 2003 3:24 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT?: HyperThreading

I interpreted that to mean server forms of 2000 also.  From the testing I
have done I doubt that anything terribly wrong happens because of
HyperThreading -- it's just a question of what is more efficient for how you
use the server.  Here I am not talking about peak load, but about average
response time.

It's possible I might drop back to the 2000 server to run some tests there
-- I don't know yet.

tim

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Brian Murphy
Sent: Tuesday, June 03, 2003 3:11 PM
To: 'thin@xxxxxxxxxxxxx'
Subject: [THIN] Re: OT?: HyperThreading


This article specifies "desktops".  Did you find anything specific to
"server"?
Microsoft* Windows* Operating System Desktop Based PCs

I know the article references Windows 2000 (All Versions) but seems to be
indicating P4 based desktop machines.

I would be interested to see if there are any known issues with the Xeon
processor based server models and Citrix Metaframe (Windows 2000 Server).

-Murphy


-----Original Message-----
From: Tim Mangan [mailto:tmangan@xxxxxxxxxxxx]
Sent: Tuesday, June 03, 2003 8:32 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT?: HyperThreading


Ron,

My bad - sorry.  http://www.intel.com/support/platform/ht/os.htm

So far my testing indicates that lightly loaded servers perform better with
it turned off, heavily loaded servers with it turned on.  The OS gets fooled
into loading up logical processors on the same physical processor sometimes.
When I'm done I'll be getting this written up with the details.

If you have a handy link to the HP docs, please send.  I'll search for it if
you don't.

tim
-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Ron Oglesby
Sent: Tuesday, June 03, 2003 9:08 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: OT?: HyperThreading


Hey Tim, that link goes no where.

Ron Oglesby
Senior Technical Architect
=3D3D20
RapidApp
Office 312.372.7188
Mobile 815.325.7618
email roglesby@xxxxxxxxxxxx
=3D3D20

-----Original Message-----
From: Tim Mangan [mailto:tmangan@xxxxxxxxxxxx]=3D3D20
Sent: Tuesday, June 03, 2003 5:54 AM
To: Thin@Freelists. Org
Subject: [THIN] OT?: HyperThreading

 > I know we had a discussion on this a while back.  Someone indicated M$  >
folks were recommending disabling it in servers but didn't say why. Ran  >
across this link over the weekend.  Basically, Intel suggests disabling  >
HyperThreading on all WIn2K, NT, and prior operating systems. =3D3D20 = =3D
=3D3D20
 >      http://www.intel.com/support/platform/ht.os.htm
 >=3D3D20
 > I'm running tests against Server 2003/TS now.  I suspect you may want to
> disable it on 2003, depending on how you use the system.  Nothing bad  >
happens, but performance will be better in some cases with it turned off,  >
some cases with it on.  Has anyone seen anything written up about this?
>=3D3D20  > Timothy R. Mangan  > Founder TMurgent Technologies  >
tmangan@xxxxxxxxxxxx  > www.tmurgent.com  > +1 781-492-0403  >=3D3D20

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