[CentOS] back to: kernel: do_IRQ: 2.96 No irq handler for vector (irq -1)

Thu Aug 15 17:19:54 UTC 2013
m.roth at 5-cent.us <m.roth at 5-cent.us>

Hi, Akemi,

Akemi Yagi wrote:
> On Thu, Aug 15, 2013 at 7:32 AM,  <m.roth at 5-cent.us> wrote:
>> 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.
> You referred to http://bugs.centos.org/view.php?id=6319 in your
> earlier post. If you believe you are hit by the bug reported there, I
> strongly urge you to test the centosplus kernel that has a patch (see
> note 17700 of the bug report).

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.
> Regarding the current status, upstream BZ (
> https://bugzilla.redhat.com/show_bug.cgi?id=887006 ) is open to the
> public. It is "on QA" at the moment. I suspect the fix will be in
> EL6.5 and possibly in a 6.4 kernel update.

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?