Re: Hyperthreading/Dual core CPU's

From: Richard Miguel San Martín (rmiguel_at_senamhi.gob.pe)
Date: 11/11/05

  • Next message: Jeff Boyce: "HDD monitoring advice" 
    To: General Red Hat Linux discussion list <redhat-list@redhat.com>
Date: Fri, 11 Nov 2005 11:12:34 -0500

    Yes, i have disabled HT on my machines too, but that is because i dont have
    any application that use this feature. I dont have Dual core processors, but
    i think acquire some machines next year. In my case, i have meteorological
    applications, this is the principal reason.

    Cheers,

    R. MIguel

    On Fri, 11 Nov 2005 09:55:45 -0600, Rhugga Harper wrote
    > I would disable hyper-threading. We have 24k+ hosts (Mostly 2650's
    > and 2850's) and saw nothing but problems with hyperthreading on
    > nearly every distro: RH AS 2.1, 3 and SLES 9. In many cases it
    > actually inhibited performance. There is a very small niche of
    > applications that can benefit from hyperthreading. (Our hosts are
    > mostly oracle rac's, application servers, and other various middle-
    > tier applications) Note that the problems with hyper-threading
    > surface under heavy enterprise loads, which of course is where you
    > would need it.
    >
    > Go with AMD and their HypeTransport / dual-core. Much better performance
    > accross the boards IMHO.
    >
    > -rhugga
    >
    > On 11/11/05, Mike Ault <mike@ault.cc> wrote:
    > >
    > > As long as you load the SMP version it should see them. If not there is a
    > > relink option to turn on hyperthreading for the CPUs.
    > >
    > > Mike
    > >
    > > -----Original Message-----
    > > From: redhat-list-bounces@redhat.com [mailto:
    > > redhat-list-bounces@redhat.com]
    > > On Behalf Of Robert
    > > Sent: Friday, November 11, 2005 10:13 AM
    > > To: redhat-list@redhat.com
    > > Subject: Hyperthreading/Dual core CPU's
    > >
    > > Hi list,
    > > We have plans to buy HP DL380's and put Redhat AS 4.0, anyone know how the
    > > Hyperthreading works on Redhat, can we enable it on Redhat? does it see 2
    > > CPU's if there is only one CPU board?.
    > > In Windows 2003 we have enabled Hyperthreading and OS sees 4 CPU's (2 CPU
    > > boards).
    > > Thanks in advance
    > >
    > >
    > >
    > >
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    ------------------------------
    Richard Miguel San Martin
    Administrador de Sistemas
         CPN - SENAMHI
    Telf. 6141414 Anexo 464
    Cel. 98540364
    ------------------------------ 

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