Modifying RAM during runtime on guest

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi all!

I'm trying to modify the amount of RAM that has some of guests. Host has
2.6.30 kernel with KVM-88.

In one of guest I didn't have problems when decreasing the amount of memory
from 3584 MIB to 1024 MiB. This guest has 2.6.26-2-686 stock kernel. Also I
was trying to decrease the amount RAM of another guest from 3584 MiB to
2048 MiB, but it didn't work. This other guest has
2.6.24-etchnhalf.1-686-bigmem stock kernel. Does Ballooning in guest
require 2.6.25 or superior?

Thinking that it could be an impediment related to the kernel version of
guest, I tried to increase the memory of another one guest with
2.6.26-2-686 from 512 MIB to 1024 MIB, but this didn't work either.

These are the statistics of of memory usage in host:

# free
             total       used       free     shared    buffers     cached
Mem:      16469828   14763460    1706368          0    7800712     202044
-/+ buffers/cache:    6760704    9709124
Swap:      8319948      19240    8300708



Which can be the cause?

Thanks in advance for your reply.

Regards,
Daniel
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