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Re: [Xen-devel] XEN 4.0 + pvops kernel : system crashes on sta

To: Yuvraj Agarwal <yuvraj@xxxxxxxxxxx>
Subject: Re: [Xen-devel] XEN 4.0 + pvops kernel : system crashes on starting 155th domU
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 27 Apr 2010 11:51:43 -0700
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On 04/27/2010 12:41 AM, Yuvraj Agarwal wrote:
> Hi All,
> We are setting up a system with a large number of very small VMs for a
> project. We worked through a number of limitations, including those
> imposed by blktap2 devices and the number of dynamic IRQ (set kernel
> config NR_CPUS) etc. After these changes we were able to get to  154
> domUs (!), but as soon as we start up the 155^th domU the system crashes.

How does the system crash?  You mean the dom0 kernel crashes?

> Does anyone know where this limit of 155 domU is coming from and how
> we can fix/increase it?

What does /proc/interrupts look like before the crash?  How many network
and block devices do you have in dom0?


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