Re: [Xen-users] Xen 4.0.1 hangs when trying to create vps

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Feb 21, 2011 at 10:52:49AM +0100, Pim van Riezen wrote:
> 
> On Feb 21, 2011, at 10:48 , Pasi Kärkkäinen wrote:
> 
> > On Wed, Feb 02, 2011 at 02:00:36PM +0100, Pim van Riezen wrote:
> >> Good day,
> >> 
> >> we recently migrated to Xen4.0.1 on one of our clusters. It solves a lot 
> >> of problem, but it also adds one. Whenever we try to xm create a guest 
> >> that oversteps the total amount of available memory, xend completely hangs 
> >> itself up and stops responding to any rpc calls..
> >> 
> >> The last lines in xend.log are:
> >> 
> >> [2011-02-02 10:00:22 8199] DEBUG (balloon:172) Balloon: tmem relinquished 
> >> -1 KiB of 20100116 KiB requested.
> >> [2011-02-02 10:00:22 8199] DEBUG (balloon:226) Balloon: 13454316 KiB free; 
> >> 0 to scrub; need 33554432; retries: 115.
> >> [2011-02-02 10:00:22 8199] DEBUG (balloon:226) Balloon: 13454316 KiB free; 
> >> 0 to scrub; need 33554432; retries: 210.
> >> 
> >> is there a way to recover from this?
> >> 
> > 
> > Did you dedicate fixed amount of memory for dom0?
> 
> Yes.
> 
> > Are you using tmem? 
> 
> No.
> 

Ok. Did you disable dom0 ballooning? 
http://wiki.xensource.com/xenwiki/XenBestPractices

It looks like xend is trying to balloon down dom0, which seems to fail and 
crash things.

-- Pasi


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