Bug#784688: Thousands of "xen:balloon: Cannot add additional memory (-17) messages" despite dom0 ballooning disabled

[Martin Lucina <martin@lucina.net>]

On Wednesday, 27.05.2015 at 10:05, Martin Lucina wrote:
> > Does "xl mem-set 0 4051" make the messages stop? If not what about using
> > 4050?
> 
> I'm not sure if this is due to my rebooting the dom0 since I reported this
> issue, it now appears to be using a slightly different amount of memory
> just under the target:
> 
> Domain-0                                     0  4065     8     r-----   36437.3
> 
> xl mem-set 0 4065 seems to have made the messages stop. Will run with it
> for a while and see what happens.

No messages for ~4 days, then it started again.

What is weird is that dom0 now thinks it has less memory:

Domain-0                                     0  4064     8     r-----   41240.6

4064 vs. 4065. I did not change anything.

So, something is causing dom0 to change its memory target, despite the fact
that ballooning should be disabled.

Relevant files from xen_memory0:

./info/current_kb:
4162252
./info/low_kb:
0
./info/high_kb:
0
./max_schedule_delay:
20
./retry_count:
1
./target_kb:
4162560
./target:
4262461440
./uevent:
./schedule_delay:
1
./max_retry_count:
0

Any ideas?

Martin