A boot-up dmesg can be helpful as kernel outputs detailed memory usages
such as below:
[ 0.000000] e820: BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000001fffffff] usable
[ 0.000000] BIOS-e820: [mem 0x0000000020000000-0x00000000201fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000020200000-0x000000003fffffff] usable
[ 0.000000] BIOS-e820: [mem 0x0000000040000000-0x00000000401fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000040200000-0x00000000ca7b8fff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000ca7b9000-0x00000000ca8c0fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ca8c1000-0x00000000ca90cfff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000ca90d000-0x00000000caa1ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000caa20000-0x00000000caa27fff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x00000000caa28000-0x00000000cac29fff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000cac2a000-0x00000000cac4cfff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000cac4d000-0x00000000cac4dfff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000cac4e000-0x00000000cacaefff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000cacaf000-0x00000000caccdfff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000cacce000-0x00000000cacf6fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000cacf7000-0x00000000cad39fff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x00000000cad3a000-0x00000000caffffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000cb800000-0x00000000cf9fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000022e5fffff] usable
Often memory can be reserved for other purposes and therefore is not
available for OS. A most common example is to be used by integrated VGA.
The size can range from 16MB to 512+MB, depending on hardware design.
It can also be BIOS bug if it fails to assign memory above 4GB.
** Changed in: hwe-next
Status: Confirmed => Incomplete
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Packages, which is subscribed to linux-lts-utopic in Ubuntu.
https://bugs.launchpad.net/bugs/1434014
Title:
[Lenovo E450] Run test case 'memory/info' is failed.
Status in HWE Next Project:
Incomplete
Status in linux-lts-utopic package in Ubuntu:
New
Bug description:
CID : 201407-15368 Lenovo E450 (A+A) with 14.04.2 (utopic)
Steps:
1. Install 14.04.2 on E450
2. Install Plainbox and run test case 'memory/info'. (This test checks the
amount of memory which is reporting in meminfo against the size of the memory
modules detected by DMI.)
Expected result:
Test result should be pass.
Actual result:
/proc/meminfo reports: 3.13GiB
lshw reports: 4GiB
FAIL: Meminfo reports 930258944 less than lshw, a difference of
21.66%. Only a variance of 20% in reported memory is allowed.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-30-generic 3.16.0-30.40~14.04.1 [modified:
boot/vmlinuz-3.16.0-30-generic]
ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
Uname: Linux 3.16.0-30-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Mar 19 06:28:49 2015
InstallationDate: Installed on 2015-03-18 (1 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64
(20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)
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