Re: kernel BUG at arch/x86/kernel/io_apic_64.c:357!

[Yinghai Lu]

On Tue, Jul 29, 2008 at 3:17 PM, Mike Travis <travis@xxxxxxx> wrote:
> Eric W. Biederman wrote:
>> "Yinghai Lu" <yhlu.kernel@xxxxxxxxx> writes:
>>
>>> On Tue, Jul 29, 2008 at 11:35 AM, Yinghai Lu <yhlu.kernel@xxxxxxxxx> wrote:
>>>> On Tue, Jul 29, 2008 at 9:09 AM, Dhaval Giani <dhaval@xxxxxxxxxxxxxxxxxx>
>>> wrote:
>>>>> Hi Ingo, Thomas,
>>>>>
>>>>> Hit this on 2.6.27-rc1
>>>>>
>>>>> (The kernel bug is at line 356 (Its 357 as I applied a debug patch to
>>>>> print out the irq) (Full dmesg and .config attached)
>>>> can you boot with "debug apic=verbose pci=routeirq"?
>>> please try attached patch
>
> I didn't follow this from the start but one reason why NR_IRQS based on
> NR_CPUS is a bad idea, is the huge (nearly 300Mb) increase in memory usage
> (that's mostly wasted.)  I believe there's another patch coming real soon
> now to make irq allocations dynamic.  (I had also hoped to look closer at
> your irq abstraction patch you sent a while back.  Does that also address
> this issue?)

Yes.

>
> But this would be a show stopper for SGI being able to ship systems if the
> distros do not want to waste this much memory and won't set NR_CPUS=4096.

wonder if nr_irqs need to be probed dynamically too.

YH
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