hyperthreaded processors running on win2k

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From: Mark (maxmann_at_kc.rr.com)
Date: 04/18/04

  • Next message: Dejan Sarka: "Re: Error: 3624 - SQL Server Assertion" 
    Date: Sun, 18 Apr 2004 01:44:20 -0500

    My company is currently deploying new hardware for our new hosting site. We
    have all new servers. 4 of them are running Win2k standard server and are
    web servers, and 3 of them are win2k advanced servers running SQL Server
    2000.
    These servers have dual Xeons, so if hyperthreading is on, win2k sees 4
    procs.

    We have been working on tracking down speed issues for quite a while and
    recently realized (by accident) , that the webservers run WAY faster when
    hyperthreading is turned off. We are using MS Application Center Test for
    load testing, so that's how we determined the performance gain.

    I've been trying to find a clear cut answer about whether or not you should
    use hyperthreading on win2k server, but I haven't found one. Although I have
    seen several references to this issue and seen posts of people saying to
    shut if off. It seems win2k doesn't know the difference between logical and
    physical processors, so maybe that's why it's not good for win2k. ?

    Does anyone know where I could find more info on this? We're going to turn
    off hyperthreading on the webservers obviously because they perform better,
    but I'm wondering if we will see performance gains by also shutting of
    hyperthreading on the win2k SQL Servers. ?

    Any insight into this would be great.

    Thanks.

  • Next message: Dejan Sarka: "Re: Error: 3624 - SQL Server Assertion"

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