[THIN] Re: Hyperthreading

  • From: "Brian Madden" <brian@xxxxxxxxxxxxxxx>
  • To: <thin@xxxxxxxxxxxxx>
  • Date: Thu, 30 Sep 2004 11:33:48 -0400

The main problems in W2K with Hyperthreading are:

(1) Stability. I haven't seen this personally, but it's something that
everyone says
(2) W2K doesn't realize that 4 hyperthreaded processors are really two
physical processors. The problem is that the system might try to "load
balance" some work evenly across processors 0 and 1, thinking it's doing
a good job but not realizing that they're really going to the same
place, all while procs 2 and 3 are sitting idle. Multiply this by
several billion ticks per second and it could in theory lead to worse
performance.

Again, it's only a few percentage points, and if someone is gung-ho for
THE on W2K, I won't stand in their way.

Brian

Brian Madden
brian@xxxxxxxxxxxxxxx
+1.202.302.3657
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-----Original Message-----
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On
Behalf Of Bob
Sent: Thursday, September 30, 2004 10:57 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Hyperthreading

Thanks, Jim... great article on the benefits of HTE

-but-

Intel is criminally terse in their statement that it should be
disabled on Win2k.  I can't tell if their rationale is functional or
political.  I'm about to rock the boat here, and I'm going to be asked
tough questions.  I'm hoping somebody will weigh in with some personal
trials.

Thanks,
Bob



----- Original Message -----
From: Jim Kenzig http://thethin.net <jimkenz@xxxxxxxxxxxxxx>
Date: Thu, 30 Sep 2004 07:06:52 -0700 (PDT)
Subject: [THIN] Re: Hyperthreading
To: thin@xxxxxxxxxxxxx


See
http://www.2cpu.com/articles/42_1.html
http://thethin.net/faqs2.cfm?id=444&category=1&sortby=score
Leave it off for Win2K!
http://thethin.net/faqs2.cfm?id=443&category=1&sortby=score
 
Regards,
Jim Kenzig
http://thin.net


 

Bob <bobmails@xxxxxxxxx> wrote:


Has anybody experimented with Hyperthreading On -vs- Off on Win2k
servers? I've heard rumblings that it can be problematic, and perhaps
decrease performance. I noticed that most SpecInt. winners have it
disabled. I'm considering disabling it on one of my farm servers to
observe the results. If anybody else has experimented I'd love to
hear about it.

Thanks in advance,
Bob
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