Re: [Xen-devel] Maximum number of domains and NR_IRQS

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 7/12/06 15:37, "Carb, Brian A" <Brian.Carb@xxxxxxxxxx> wrote:

> We successfully start 118 DOMUs, but when we try to start the 119th, the system panics with the following messages:
>   Kernel panic - not syncing: No available IRQ to bind to: increase NR_IRQS!
>   (XEN) Domain 0 crashed: rebooting machine in 5 seconds.
>  
> The documentation in include/asm-x86_64/irq.h suggests that the value of NR_IRQS under x86_64 is limited to 256. In fact, when we rebuilt xen-unstable with NR_IRQS set to 768, the kernel panics on boot (see below).
>  

It’s not Xen’s NR_IRQS you should increase; only Linux’s.

This out-of-IRQs condition shouldn’t crash the dom0 of course. I’ll look into that.

 -- Keir



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