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Kernel SMP and normal on SMP based processor

Discussion in 'General Discussion' started by Grzeslaw, Jul 12, 2007.

  1. Grzeslaw

    Grzeslaw Well-Known Member

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    Hello

    When I type: the yum update command, the result is following:
    Code:
    root@s74 [~]#  yum list updates
    Setting up repositories
    Reading repository metadata in from local files
    Excluding Packages in global exclude list
    Finished
    Updated Packages
    kernel.i686                              2.6.9-55.0.2.EL        update
    kernel-smp.i686                       2.6.9-55.0.2.EL        update
    
    Server has the Xeon processor, so the kernel should be SMP.
    My question is: what is the kernel.i686 package ? and can I safely update it? I am affraid that after update, the kernel changed to the version without SMP.
     
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  2. cooldude7273

    cooldude7273 Well-Known Member

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    A SMP kernel is only needed if you have more than one processor. That includes dual Xeons, dual core procs, and procs with Hyperthreading. So, if all you have is a single Xeon, with no HyperThreading, and not dual core, you can go with the normal kernel.i686.

    If you want some professional help updating your kernel, just let me know. (you have your PMs disabled, so I can't contact you.)
     
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  3. Grzeslaw

    Grzeslaw Well-Known Member

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    I know the idea of SMP kernels . I use the Intel(R) Xeon(TM) CPU 2.80GHz on server. I just wondering what do (and can i safely update) the package kernel.i686 when I use the SMP kernel by defaults.
    Code:
    root@s74 [~]# uname -pvr
    2.6.9-42.0.10.ELsmp #1 SMP Tue Feb 27 10:11:19 EST 2007 i686
    
    Regards
     
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  4. cooldude7273

    cooldude7273 Well-Known Member

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    I'm not sure why you would be using a smp kernel on a single proc server - it's not going to kill it, but it's not needed.

    I've never personally used yum to update a kernal as I wouldn't trust yum with something so critical. I've always just used the good old fashioned rpm method with a --force flag to make sure it switches from the smp to non-smp.
     
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    #4 cooldude7273, Jul 12, 2007
    Last edited: Jul 12, 2007
  5. Grzeslaw

    Grzeslaw Well-Known Member

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    Code:
    root@s74 [~]# cat /proc/cpuinfo
    processor       : 0
    vendor_id       : GenuineIntel
    cpu family      : 15
    model           : 4
    model name      : Intel(R) Xeon(TM) CPU 2.80GHz
    stepping        : 3
    cpu MHz         : 2801.725
    cache size      : 2048 KB
    physical id     : 0
    siblings        : 2
    core id         : 0
    cpu cores       : 1
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 5
    wp              : yes
    flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl cid xtpr
    bogomips        : 5603.96
    
    processor       : 1
    vendor_id       : GenuineIntel
    cpu family      : 15
    model           : 4
    model name      : Intel(R) Xeon(TM) CPU 2.80GHz
    stepping        : 3
    cpu MHz         : 2801.725
    cache size      : 2048 KB
    physical id     : 0
    siblings        : 2
    core id         : 0
    cpu cores       : 1
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 5
    wp              : yes
    flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl cid xtpr
    bogomips        : 5599.47
    
    processor       : 2
    vendor_id       : GenuineIntel
    cpu family      : 15
    model           : 4
    model name      : Intel(R) Xeon(TM) CPU 2.80GHz
    stepping        : 3
    cpu MHz         : 2801.725
    cache size      : 2048 KB
    physical id     : 3
    siblings        : 2
    core id         : 3
    cpu cores       : 1
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 5
    wp              : yes
    flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl cid xtpr
    bogomips        : 5599.61
    
    processor       : 3
    vendor_id       : GenuineIntel
    cpu family      : 15
    model           : 4
    model name      : Intel(R) Xeon(TM) CPU 2.80GHz
    stepping        : 3
    cpu MHz         : 2801.725
    cache size      : 2048 KB
    physical id     : 3
    siblings        : 2
    core id         : 3
    cpu cores       : 1
    fdiv_bug        : no
    hlt_bug         : no
    f00f_bug        : no
    coma_bug        : no
    fpu             : yes
    fpu_exception   : yes
    cpuid level     : 5
    wp              : yes
    flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe lm constant_tsc pni monitor ds_cpl cid xtpr
    bogomips        : 5599.63
    
    Isn't a dual xeon ?
    So I need SMP or not ?
     
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  6. cooldude7273

    cooldude7273 Well-Known Member

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    Yes, you do need SMP.
     
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  7. Grzeslaw

    Grzeslaw Well-Known Member

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    okey, but back to begining of the post.: is it safely to update the package kernel.i686 ? and why is it installed for, when i use the smp kernel :confused:
     
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  8. chirpy

    chirpy Well-Known Member

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    Go on, have a guess
    There's not need to install the the single-core kernel, just do the SMP one with:

    yum install kernel-smp
     
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  9. Grzeslaw

    Grzeslaw Well-Known Member

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    ok, so can I remove the previous kernel kernel.i686 - which yum wont's to update?
     
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  10. chirpy

    chirpy Well-Known Member

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    Yes, you can, just be careful when typing :)
     
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  11. Grzeslaw

    Grzeslaw Well-Known Member

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    thank you very mych ;)
     
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