Verified fix using kernel 3.2.0-111.
Before patched kernel:
ubuntu@lp1622567:~$ uname -a
Linux lp1622567 3.2.0-110-virtual #151-Ubuntu SMP Tue Aug 30 14:46:28 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@lp1622567:~$ free
total used free shared buffers cached
Mem: 3786332 146904 3639428 0 11224 43648
-/+ buffers/cache: 92032 3694300
Swap: 0 0 0
After patched kernel:
ubuntu@lp1622567:~$ uname -a
Linux lp1622567 3.2.0-111-virtual #153-Ubuntu SMP Wed Sep 21 21:49:22 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux
ubuntu@lp1622567:~$ free
total used free shared buffers cached
Mem: 4048476 147860 3900616 0 11612 43616
-/+ buffers/cache: 92632 3955844
Swap: 0 0 0
** Tags removed: verification-needed-precise
** Tags added: verification-done-precise
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1622567
Title:
Xen guest total memory size smaller than specified in virtual
configuration due to Xen balloon driver
Status in linux package in Ubuntu:
Fix Released
Bug description:
[Impact]
On virtual systems under Xen, the kernel does not correctly calculate
the total amount of memory. This results in the system having
slightly less memory available for use than the actual amount provided
by Xen.
[Fix]
See first comment.
[Test Case]
Load a virtual Xen guest with the latest precise (3.2) kernel, and
notice that its total memory is less than what is allocated in the Xen
configuration. Also possible is to load a virtual Xen guest, with the
exact same Xen guest config/parameters, with the latest trusty (3.13)
kernel; on trusty and later, the total amount of memory is correctly
detected.
[Regression Potential]
None known.
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