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 Sign up now for BriForum 2005: A 100% technical, 100% independent server-based computing conference from April 11-12, 2005. Visit www.briforum.com for details. -----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 ******************************************************** This Weeks Sponsor RTO Software Do you know which applications are abusing your CPU and memory? Would you like to learn? -- Free for a limited time! Get the RTO Performance Analyzer to quickly learn the applications, users, and time of day possible problems exist. http://www.rtosoft.com/enter.asp?id=320 ********************************************************** Useful Thin Client Computing Links are a vailable at: http://thin.net/links.cfm *********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thin.net/citrixlist.cfm ******************************************************** This Weeks Sponsor RTO Software Do you know which applications are abusing your CPU and memory? Would you like to learn? -- Free for a limited time! Get the RTO Performance Analyzer to quickly learn the applications, users, and time of day possible problems exist. http://www.rtosoft.com/enter.asp?id=320 ********************************************************** Useful Thin Client Computing Links are available at: http://thin.net/links.cfm *********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thin.net/citrixlist.cfm ******************************************************** This Weeks Sponsor RTO Software Do you know which applications are abusing your CPU and memory? Would you like to learn? -- Free for a limited time! Get the RTO Performance Analyzer to quickly learn the applications, users, and time of day possible problems exist. http://www.rtosoft.com/enter.asp?id20 ********************************************************** Useful Thin Client Computing Links are available at: http://thin.net/links.cfm *********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thin.net/citrixlist.cfm