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

[Florian Heigl <florian.heigl@xxxxxxxxx>]

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
ballon
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.)

Flo

-- 
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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