Back To: Kernel: Do_IRQ: 2.96 No Irq Handler For Vector (irq -1)

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I asked here a week or so ago, and referenced an older bug, but haven’t seen any comments. Googling, I see others asking about the same. Datum:
*every* one I’ve found is like this: they’re all HP DL580’s or DL380’s, or such.

This is being used for heavy-duty scientific computing. Does anyone know if it *will* it seriously affect throughput speed if I turn off irqbalance?

It’s running 6.4, btw.

mark

3 thoughts on - Back To: Kernel: Do_IRQ: 2.96 No Irq Handler For Vector (irq -1)

  • —– Original Message —–
    | I asked here a week or so ago, and referenced an older bug, but
    | haven’t
    | seen any comments. Googling, I see others asking about the same.
    | Datum:
    | *every* one I’ve found is like this: they’re all HP DL580’s or
    | DL380’s, or
    | such.
    |
    | This is being used for heavy-duty scientific computing. Does anyone
    | know
    | if it *will* it seriously affect throughput speed if I turn off
    | irqbalance?
    |
    | It’s running 6.4, btw.
    |
    | mark

    That really depends on the type of computing. If it’s memory or CPU intensive computing it should have little to no affect. However, if you are doing heavy I/O intensive operations, more specifically network intensive, then yes, disabling irqbalance will have a fairly significant affect on performance for those operations.


    James A. Peltier Manager, IT Services – Research Computing Group Simon Fraser University – Burnaby Campus Phone : 778-782-6573
    Fax : 778-782-3045
    E-Mail : jpeltier@sfu.ca Website : http://www.sfu.ca/itservices

    “A successful person is one who can lay a solid foundation from the bricks others have thrown at them.” -David Brinkley via Luke Shaw

  • Hi, Akemi,

    Akemi Yagi wrote:

    I’m checking with the system co-owner (the other co-owner is another Institute…), and that may take a while, because they’ve set up samba on it, so there’s a number of folks hitting this box.

    I see in the last message that I could set intremap=off on the grub kernel command line. It then mentions “If intr-remap is turned off, you’ll also have to add the kvm parameter to the boot line, or in an /etc/modprobe.d file, allow_unsafe_assigned_interrupts . Otherwise, kvm device assignment will fail.”. Now, the only kvm I know is the virtual machine package; as there are no VMs running on this system, is this relevant to me?

    mark

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