[Xen-users] Re: [Xen-devel] NR_IRQ limit

[Eric Windisch <eric@xxxxxxxxxxxx>]

On Feb 29, 2008, at 5:13 PM, Subrahmanian, Raj wrote:

> Eric,
>
> In that case, you will need to change the NR_DYNIRQS value in ./ 
> linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/irq_vectors.h and  
> recompile your Dom0.
Thank you.  I assume I'll still have to change NR_VECTORS in Xen  
itself, right?
> I think you are trying to boot large numbers of VMs.
I'm currently booting 80 guests, each with two vdb, one vif.   I am  
prevented from creating more at this time due to the limited number of  
IRQs (80*3=240 + various others for console/xenbus/etc).  Ultimately,  
I'd like to try bringing this up to 160, or even 320 guests if the  
hardware allows.
My kernels are compiling now, I'll test them out on my test machine,  
and hopefully I'll be able to get these changes into production  
tomorrow.
Regards,

Eric Windisch
GrokThis.net

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