which ubuntu dapper kernel better fits a xeon dual core?

Discussion in 'Server Operation' started by lyndros, Jan 8, 2008.

  1. lyndros

    lyndros New Member

    hi guys,

    two questions:
    1)
    wich kernel better fits dapper on xeon dual core with ubuntu dapper ?
    Currently i am using 2.6.15.29-server, smp supports seems working fine, 2 cpus brought up (2 cores), top shows only one cpu but seems a top issue because htop shows both cores.

    i don't like wasting time compiling kernels wich is the best? 686-smp ? etc

    2)
    i have read that enabling hyperthreading make the server slower, that's true?


    thks again :)
     
  2. falko

    falko Super Moderator

    What does
    Code:
    cat /proc/cpuinfo
    show?
     
  3. lyndros

    lyndros New Member

    here we go:

    $cat /proc/cpuinfo

    processor : 0
    vendor_id : GenuineIntel
    cpu family : 6
    model : 15
    model name : Intel(R) Xeon(R) CPU 3050 @ 2.13GHz
    stepping : 2
    cpu MHz : 2133.597
    cache size : 2048 KB
    physical id : 0
    siblings : 1
    core id : 255
    cpu cores : 1
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 10
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
    bogomips : 4271.58

    processor : 1
    vendor_id : GenuineIntel
    cpu family : 6
    model : 15
    model name : Intel(R) Xeon(R) CPU 3050 @ 2.13GHz
    stepping : 2
    cpu MHz : 2133.597
    cache size : 2048 KB
    physical id : 1
    siblings : 1
    core id : 255
    cpu cores : 1
    fdiv_bug : no
    hlt_bug : no
    f00f_bug : no
    coma_bug : no
    fpu : yes
    fpu_exception : yes
    cpuid level : 10
    wp : yes
    flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm pni monitor ds_cpl vmx est tm2 cx16 xtpr lahf_lm
    bogomips : 4267.11

    Both kernels -server & -686 brought me up 2 cpus, so cores seem to be running fine, but wich are the differences, wich better fix a dual core xeon.

    thks in advanced :)
     
  4. edge

    edge HowtoForge Supporter

    Not sure if it will help you, but within TOP you can press 1 to toggle SMP view.

    I'm using 2.6.8-3-686-smp on my dual Xeon servers (running Debian Edge)

     
  5. falko

    falko Super Moderator

    That's hard to tell. I think the -server kernel has some optimizations for servers, so I'd go with that one, I think.
     
  6. Hans

    Hans Moderator

    I use the Linux kernel 2.6.8-12-em64t-p4-smp.
    This kernel is for Intel EM64T SMP systems and works flawless on my Dell servers with Intel dual Xeon processors and Debian Etch.

    How i installed the kernel for Debian is decribed here": http://www.howtoforge.com/forums/showthread.php?t=19465
     
    Last edited: Jan 15, 2008
  7. lyndros

    lyndros New Member

    the problem is that ubuntu by default runs -server kernel so i am afraid that this is the most compatible so some enhancements has been disabled.

    wow i dont know that about top, pressing 1 to toggle (thks)

    thk u very much guys :)
     

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