Re: XEN 4.0 + 2.6.31.13 pvops kernel : system crashes on starting 155th domU

[Keir Fraser <keir.fraser@eu.citrix.com>]

I think nr_irqs is specifiable on the command line on newer kernels. You may
be able to do nr_irqs=65536 as a kernel boot parameter, or something like
that, without needing to rebuild the kernel.

 -- Keir

On 28/04/2010 02:02, "Yuvraj Agarwal" <yuvraj@cs.ucsd.edu> wrote:

> Actually, I did identify the problem (don’t know the fix) at least from
> the console logs. Its related to running out of nr_irq's  (attached JPG
> for the console log).
> 
> 
> -----Original Message-----
> From: xen-devel-bounces@lists.xensource.com
> [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of Keir Fraser
> Sent: Tuesday, April 27, 2010 5:44 PM
> To: Yuvraj Agarwal; xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel] XEN 4.0 + 2.6.31.13 pvops kernel : system crashes
> on starting 155th domU
> 
> On 27/04/2010 08:41, "Yuvraj Agarwal" <yuvraj@cs.ucsd.edu> wrote:
> 
>> Attached is the output of /var/log/daemon.log and /var/log/xen/xend.log,
> but
>> as far as we can see we don¹t quite know what might be going causing the
>> system to crash (no console access anymore and system becomes
> unresponsive and
>> needs to be power-cycled).  I have pasted only the relevant bits of
>> information (the last domU that did successfully start and the next one
> that
>> failed). It may be the case that all the log messages weren¹t flushed
> before
>> the system crashedŠ
>> 
>> Does anyone know where this limit of 155 domU is coming from and how we
> can
>> fix/increase it?
> 
> Get a serial line on a test box, and capture Xen logging output on it. You
> can both see if any crash messages come from Xen when the 155th domain is
> created, and also try the serial debug keys (e.g., try 'h' to get help to
> start with) to see whether Xen itself is still alive.
> 
>  -- Keir
> 
> 
> 
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