From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Magenheimer <dan.magenheimer@oracle.com>
Subject: Linux mainstream balloon driver fails to grow memory=
	-> maxmem=
Date: Mon, 23 Aug 2010 16:49:26 -0700 (PDT)
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To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: xen-devel@lists.xensource.com, Vasiliy G Tolstov <v.tolstov@selfip.ru>
List-Id: xen-devel@lists.xenproject.org

Hi Jeremy --

Vasiliy discovered (and I confirmed) that the mainstream
Linux balloon driver won't balloon above the initial
memory with which the Linux guest was launched.  E.g.
a 2.6.34 guest launched with these in vm.cfg:

memory=3D1024
maxmem=3D1536

displays properly in xentop, but changing target_kb
in /sys/devices/system/xen_memory/xen_memory0
doesn't "take" for any value greater than 1024*1024.

We tested with 2.6.34 but it even fails in RHEL6 Beta2.

Is this a known problem/bug (or maybe a feature)?

Thanks,
Dan