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== Comment: #0 - Ofer Baruch - 2016-08-28 07:41:53 ==
When you set the memory size of a Ubuntu Guest to a number which is not a
multiple of the memory block size (in our case 256MB) there are missing memory
slots at /sys/bus/memory/devices.
for example setting memory like this:
STORAGE = 2704M MAX = 15000M INC = 8M STANDBY = 512M RESERVED = 512M
will cause memory slot 10 to be missing:
root@UBU9LT1:/sys/bus/memory/devices# ll
total 0
drwxr-xr-x 2 root root 0 Aug 24 09:43 ./
drwxr-xr-x 4 root root 0 Aug 24 09:43 ../
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory0 ->
../../../devices/system/memory/memory0/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory1 ->
../../../devices/system/memory/memory1/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory11 ->
../../../devices/system/memory/memory11/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory12 ->
../../../devices/system/memory/memory12/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory13 ->
../../../devices/system/memory/memory13/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory2 ->
../../../devices/system/memory/memory2/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory3 ->
../../../devices/system/memory/memory3/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory4 ->
../../../devices/system/memory/memory4/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory5 ->
../../../devices/system/memory/memory5/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory6 ->
../../../devices/system/memory/memory6/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory7 ->
../../../devices/system/memory/memory7/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory8 ->
../../../devices/system/memory/memory8/
lrwxrwxrwx 1 root root 0 Aug 24 09:43 memory9 ->
../../../devices/system/memory/memory9/
lsmem shows:
root@UBU9LT1:/sys/bus/memory/devices# lsmem -a
Address Range Size (MB) State Removable Device
===============================================================================
0x0000000000000000-0x000000000fffffff 256 online no 0-31
0x0000000010000000-0x000000001fffffff 256 online yes 32-63
0x0000000020000000-0x000000002fffffff 256 online yes 64-95
0x0000000030000000-0x000000003fffffff 256 online yes 96-127
0x0000000040000000-0x000000004fffffff 256 online yes 128-159
0x0000000050000000-0x000000005fffffff 256 online yes 160-191
0x0000000060000000-0x000000006fffffff 256 online yes 192-223
0x0000000070000000-0x000000007fffffff 256 online no 224-255
0x0000000080000000-0x000000008fffffff 256 online yes 256-287
0x0000000090000000-0x000000009fffffff 256 online no 288-319
0x00000000b0000000-0x00000000bfffffff 256 offline - 352-383
0x00000000c0000000-0x00000000cfffffff 256 offline - 384-415
0x00000000d0000000-0x00000000dfffffff 256 offline - 416-447
although there is 1GB of memory in standby and reserved i can only vary
online 768MB as there are only 3 offline blocks... there should be 4
blocks available... specifically block number 10 is missing
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-145663 severity-high
targetmilestone-inin1604
--
missing memory slot at /sys/bus/memory/devices when starting memory size is not
a multiple of block size
https://bugs.launchpad.net/bugs/1618203
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