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Re: [Xen-users] xend hangs if out of memory

To: Pim van Riezen <pi@xxxxxxxxxxxxx>
Subject: Re: [Xen-users] xend hangs if out of memory
From: Florian Heigl <florian.heigl@xxxxxxxxx>
Date: Wed, 9 Feb 2011 20:40:22 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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Hi Pim,

2011/2/2 Pim van Riezen <pi@xxxxxxxxxxxxx>:
> 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 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.

what was ballooned here? dom0?

if yes:
Do not
your dom0 ever

(unless it's just a test or dev workstation, there you may even say
"works for me".
Pin dom0 to a sane default and stick by it, disable it's ballooning.)


the purpose of libvirt is to provide an abstraction layer hiding all
xen features added since 2006 until they were finally understood and
copied by the kvm devs.

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