[THIN] Re: Hyper-Threading (again!)

I suspect that with better hardware, the results would be different with
more processors as well. In essence, that quad 1.6Ghz looks like an 8-way
1Ghz.  The surroundings may not have been up to the task.  We all live with
the hardware we have.  So perhaps, with some older hardware it might not add
anything.  But if you bought a 4-way this year I would look at enabling the
Hyper-Threading.  I have been outspoken on this list against HT in the
past -- but my thinking has turned around 180 degrees.

While the additional processors does chew up some more memory, reduced
processor queue lengths are the bennefit.

tim

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Jim Kenzig
Sent: Friday, June 20, 2003 11:36 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyper-Threading (again!)


Ya, the bottom line of this doc is if you have 4 processors and turn it on
there isn't much worth to it. With 2 processors you get about 11%
performance increase. But looking at the charts it didn't seem very
significant in any one area and appeared that quite a bit less memory was
used if hyperthreading was turned off.
JK

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Angus Macdonald
Sent: Friday, June 20, 2003 11:24 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyper-Threading (again!)


Is it just me or are the graphs on that page some of the least informative
around?

-----Original Message-----
From: Jim Kenzig [mailto:jimkenz@xxxxxxxxxxxxxx]
Sent: 20 June 2003 16:14
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyper-Threading (again!)


I also found this recent doc from Citrix site:
CTX101880 How Hyper-Threading Affects User Capacity of Metaframe XP Servers
http://support.citrix.com/kb/entry!default.jspa?categoryID=118&entryID=2468&;
fromSearchPage=true

(link will probably wrap)
JK

-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx]On
Behalf Of Jim Kenzig
Sent: Friday, June 20, 2003 10:17 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyper-Threading (again!)


Hmm found this document on Hyperthreading support from MS
http://www.microsoft.com/whdc/hwdev/platform/proc/HT-Windows.mspx

In it states:
        All versions of the Windows 2000 operating system are fully
compliant with HT and should run without error on HT-enabled systems.
However, neither Windows 2000 nor any of its service packs support the
identification of HT processors. The type of modifications that are required
for HT processor identification and support are not typically supported in a
service pack. There are no plans to introduce this support in any future
Windows 2000 service pack.
        As a result, Windows 2000 treats each logical processor as if it
were an individual physical processor. The operating system attempts to
start each logical processor in the sequence in which it was listed by the
BIOS until the number of processors that have been started is equal to the
processor license limit for that version of the operating system. Table 1
shows the processor limits for Windows 2000 versions.

JK
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