This is fixed by commit:
c275a57f5ec3056f732843b11659d892235faff7 (xen/balloon: Set balloon's initial
state to number of existing RAM pages)
which requires part of commit:
7ee3d4e8cd560500192d80ca84d7f15d6dee0807 (mm: introduce helper function
mem_init_print_info() to simplify mem_init())
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1622567
Title:
kernel does not calculate correct total memory size
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.
[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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