Re: can not use all available memory

[Alexander Bienzeisler <chosi@amd.co.at>]

As Ian said, i did not disable autoballooning. It works with 
autoballooning=0.

Thanks everyone and sorry for wasting your time.

Am 23.11.2012 13:33, schrieb Ian Campbell:
> On Fri, 2012-11-23 at 12:28 +0000, Pasi Kärkkäinen wrote:
>> On Fri, Nov 23, 2012 at 12:21:32PM +0000, Ian Campbell wrote:
>>> This question belongs on xen-users.
>>>
>>> On Fri, 2012-11-23 at 11:35 +0000, Alexander Bienzeisler wrote:
>>>> Hello,
>>>>
>>>> i just tried to add a domU with 16 gigs of ram (maxmem = 16384, memory =
>>>> 16384) with free_memory : 28969 but got an error:
>>>>
>>>> libxl: error: libxl.c:3433:libxl_set_memory_target: new target 0 for
>>>> dom0 is below the minimum threshold
>>> The clue is in this message -- you cannot safely balloon down a guest
>>> (including dom0) to an arbitrarily small value relative to its initial
>>> size. The kernel will have certain fixed datastructures etc which are
>>> sized according to the maximum amount of RAM at start of day.
>>>
>>> If you were to balloon down too low then you would run out of RAM and
>>> the OOM killer would step in and start killing stuff, so xl includes a
>>> safety catch which prevents this.
>>>
>>> If you have a huge host and want a small dom0 use the dom0_mem option
>>> and disable xl's autoballoon option or whatever the equivalent xend
>>> option is.
>>>
>> I think he was already using dom0_mem. He had 28969 free in Xen as
>> reported by "xl info".
> Then he's missed disabling autoballoon.
>
>> -- Pasi
>>
>


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