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xen-devel
Re: [Xen-devel] XEN 4.0 + 2.6.31.13 pvops kernel : system crashes on sta
On Wed, Apr 28, 2010 at 03:51:19PM -0700, Yuvraj Agarwal wrote:
> I tried making the change in
> linux-2.6-pvops.git/arch/x86/include/asm/irq_vectors.h
>
> It was:
> #define NR_VECTORS 256
> I changed it to
> #define NR_VECTORS 1024
>
> I still get the same number of nr_irqs (dmesg | grep -i nr_irq) before and
> after the change.
>
> [ 0.000000] nr_irqs_gsi: 48
> [ 0.500076] NR_IRQS:5120 nr_irqs:944
That looks to be different from the previous bootup:
[ 0.000000] NR_IRQS:4352 nr_irqs:256
?
>
> Also, as earlier it crashes on the same number of domU (154). I didn’t
> mention earlier, this a dual core Nehalem machine -- 2 (sockets) * 4 cores
> per CPU * 2 (hyperthreading)
Lots of logical CPUs, weird that your nr_irqs initially was that much
lower.
Anyhow, you mentioned that you narrowed it down to not being enough IRQs
- how did you find that out? Was there an kernel message when you
started the 155th guest?
Oh, also you say that the /proc/interrupts showed the number descending
from 255 down to 89. With this it should have started at 944 and gone
down to 49? Which roughly means 175 guests?
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