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Thread: Linux kernel no longer smp?

  1. #1
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    Jan 2008
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    Ubuntu 10.10 Maverick Meerkat

    Linux kernel no longer smp?

    I just noticed today that yesterday's (or maybe the day before's) upgrade leaves my desktop with only one processor. Which kernel do I need and how can I see which kernel was last installed?

    I now get:
    Code:
    tgrimley@tlomm-node1:~/Desktop$ uname -a
    Linux tlomm-node1 2.6.24-19-386 #1 Wed Jun 4 15:54:02 UTC 2008 i686 GNU/Linux
    I think it was running the 18-386 before (here's the relevant lines in menu.lst

    Code:
    title		Ubuntu 8.04, kernel 2.6.24-19-386
    root		(hd0,2)
    kernel		/boot/vmlinuz-2.6.24-19-386 root=UUID=de08483c-06f3-4347-b185-1023b16df07e ro quiet splash
    initrd		/boot/initrd.img-2.6.24-19-386
    quiet
    
    title		Ubuntu 8.04, kernel 2.6.24-19-386 (recovery mode)
    root		(hd0,2)
    kernel		/boot/vmlinuz-2.6.24-19-386 root=UUID=de08483c-06f3-4347-b185-1023b16df07e ro single
    initrd		/boot/initrd.img-2.6.24-19-386
    
    title		Ubuntu 8.04, kernel 2.6.24-18-386
    root		(hd0,2)
    kernel		/boot/vmlinuz-2.6.24-18-386 root=UUID=de08483c-06f3-4347-b185-1023b16df07e ro quiet splash
    initrd		/boot/initrd.img-2.6.24-18-386
    quiet
    
    title		Ubuntu 8.04, kernel 2.6.24-18-386 (recovery mode)
    root		(hd0,2)
    kernel		/boot/vmlinuz-2.6.24-18-386 root=UUID=de08483c-06f3-4347-b185-1023b16df07e ro single
    initrd		/boot/initrd.img-2.6.24-18-386

  2. #2
    Join Date
    Jan 2007
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    Hidden!
    Distro
    Ubuntu Development Release

    Re: Linux kernel no longer smp?

    Each time a kernel is introduced it is added to grub's boot menu. You can control what you see by editing menu.lst Fortunately, there is an easier and safer method, using StartUp-Manager. It will allow you to decide how many kernels to display at boot, which kernel to use, how long to display the menu, and much more.

    To learn more:
    HOWTO: Grub Menu Kernel Display Options & StartUp-Manager

    When you say you are left with only one processor, you can select how many kernels to display via StartUp-Manager.

    If you want to remove kernels from your machine, you can use synaptic to remove older images (linux-image-2.6.24-XXXX). Just make sure to keep the current one (and one other is recomended). Once a kernel is removed via synaptic the menu item for that kernel is automatically removed as well.
    Last edited by drs305; June 24th, 2008 at 06:59 PM.

  3. #3
    Join Date
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    Ubuntu 10.10 Maverick Meerkat

    Re: Linux kernel no longer smp?

    Am I crazy or was -18-386 smp enabled and -19-386 isn't?

  4. #4
    Join Date
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    Ubuntu 8.04 Hardy Heron

    Re: Linux kernel no longer smp?

    I don't think the -386 kernel has ever had SMP. You'll need the generic kernel:

    Code:
    sudo apt-get install linux-generic linux-headers-generic
    Then select the generic kernel at boot time.
    Don't try to make something "fast" until you are able to quantify "slow".

  5. #5
    Join Date
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    Kubuntu Development Release

    Re: Linux kernel no longer smp?

    There used to be a smp kernel, but it was rolled into one giant "generic" kernel.
    There are two mistakes one can make along the road to truth...not going all the way, and not starting.
    --Prince Gautama Siddharta

    #ubuntuforums web interface

  6. #6
    Join Date
    Jan 2008
    Location
    Santa Cruz, CA
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    147
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: Linux kernel no longer smp?

    Yeah, okay that makes sense. The description for generic didn't say it was SMP so I assumed I was losing my mind

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