Re: [Xen-devel] Xen 4.9 + kernel 4.13rc2 -- ballooning regression? reappearance of "Over-allocation for domain 1" errors

[Juergen Gross <jgross@xxxxxxxx>]

On 01/08/17 16:28, PGNet Dev wrote:
> On 7/28/17 9:02 AM, PGNet Dev wrote:
>> On 7/27/17 11:23 PM, Juergen Gross wrote:
>>> Can you please post the domain's config file used to create the domain
>>> and the kernel config?
>>
>> Sure.
>>
>>    https://pastebin.com/M6cr2pX7
>>
> 
> Any add'l info needed?

No, I don't think so.

IMO the problem is related to the fact that the balloon driver tries to
use then kernel's view of how much memory it is owning and setting this
number in relation to Xen's view how much memory it should try to have.

Maybe before adding memory from Xen the kernel should ask the hypervisor
how much memory it has already from Xen's point of view and how much it
is allowed to have. This will avoid the messages you have seen as long
as there are no interfering actions from Xen (e.g. lowering the maximum
reservation) while the kernel is trying to balloon up.


Juergen


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