http://bugzilla.suse.com/show_bug.cgi?id=1037967
http://bugzilla.suse.com/show_bug.cgi?id=1037967#c10
--- Comment #10 from Michal Hocko ---
dmesg says
* BIOS
[ 0.000000] e820: BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009c7ff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009c800-0x000000000009ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000005f0a8fff] usable
[ 0.000000] BIOS-e820: [mem 0x000000005f0a9000-0x000000005f0a9fff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000005f0aa000-0x000000006f29cfff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000006f29d000-0x000000006f2f6fff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x000000006f2f7000-0x000000006f9dbfff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000006f9dc000-0x0000000077ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000078000000-0x00000000785fffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000004d9f86fff] usable
[ 0.000000] BIOS-e820: [mem 0x00000004d9f87000-0x000000087f7fffff] reserved
[...]
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000001000-0x000000000009bfff]
[ 0.000000] node 0: [mem 0x0000000000100000-0x000000005f0a8fff]
[ 0.000000] node 0: [mem 0x0000000078000000-0x00000000785fffff]
[ 0.000000] node 0: [mem 0x0000000100000000-0x00000004d9f86fff]
[...]
[ 0.000000] On node 0 totalpages: 4429259
[ 0.000000] DMA zone: 64 pages used for memmap
[ 0.000000] DMA zone: 21 pages reserved
[ 0.000000] DMA zone: 3995 pages, LIFO batch:0
[ 0.000000] DMA32 zone: 6043 pages used for memmap
[ 0.000000] DMA32 zone: 386729 pages, LIFO batch:31
[ 0.000000] Normal zone: 63103 pages used for memmap
[ 0.000000] Normal zone: 4038535 pages, LIFO batch:31
which is 16GB
* EFI
[ 0.000000] e820: BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x0000000000057fff] usable
[ 0.000000] BIOS-e820: [mem 0x0000000000058000-0x0000000000058fff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000059000-0x000000000009efff] usable
[ 0.000000] BIOS-e820: [mem 0x000000000009f000-0x000000000009ffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x000000005f0a8fff] usable
[ 0.000000] BIOS-e820: [mem 0x000000005f0a9000-0x000000005f0a9fff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000005f0aa000-0x000000005f0aafff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000005f0ab000-0x000000006eedefff] usable
[ 0.000000] BIOS-e820: [mem 0x000000006eedf000-0x000000006f29cfff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000006f29d000-0x000000006f2f6fff] ACPI data
[ 0.000000] BIOS-e820: [mem 0x000000006f2f7000-0x000000006f9dbfff] ACPI NVS
[ 0.000000] BIOS-e820: [mem 0x000000006f9dc000-0x000000006fffefff] reserved
[ 0.000000] BIOS-e820: [mem 0x000000006ffff000-0x000000006fffffff] usable
[ 0.000000] BIOS-e820: [mem 0x0000000070000000-0x0000000077ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000078000000-0x00000000785fffff] usable
[ 0.000000] BIOS-e820: [mem 0x00000000f0000000-0x00000000f7ffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fe000000-0x00000000fe010fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000fee00000-0x00000000fee00fff] reserved
[ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
[ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x00000004d9f86fff] usable
[ 0.000000] BIOS-e820: [mem 0x00000004d9f87000-0x00000004d9f87fff] unusable
[ 0.000000] BIOS-e820: [mem 0x00000004d9f88000-0x000000087f7fffff] usable
[...]
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000001000-0x0000000000057fff]
[ 0.000000] node 0: [mem 0x0000000000059000-0x000000000009efff]
[ 0.000000] node 0: [mem 0x0000000000100000-0x000000005f0a8fff]
[ 0.000000] node 0: [mem 0x000000005f0ab000-0x000000006eedefff]
[ 0.000000] node 0: [mem 0x000000006ffff000-0x000000006fffffff]
[ 0.000000] node 0: [mem 0x0000000078000000-0x00000000785fffff]
[ 0.000000] node 0: [mem 0x0000000100000000-0x00000004d9f86fff]
[ 0.000000] node 0: [mem 0x00000004d9f88000-0x000000087f7fffff]
[...]
[ 0.000000] On node 0 totalpages: 8318074
[ 0.000000] DMA zone: 64 pages used for memmap
[ 0.000000] DMA zone: 25 pages reserved
[ 0.000000] DMA zone: 3997 pages, LIFO batch:0
[ 0.000000] DMA32 zone: 7060 pages used for memmap
[ 0.000000] DMA32 zone: 451806 pages, LIFO batch:31
[ 0.000000] Normal zone: 122848 pages used for memmap
[ 0.000000] Normal zone: 7862271 pages, LIFO batch:31
There are whole ranges missing e.g. 0x000000005f0ab000-0x000000006eedefff
(which is 260MB) or mem 0x00000004d9f88000-0x000000087f7fffff is reported
usable from EFI while largely overlapping
0x00000004d9f87000-0x000000087f7fffff reported by BIOS is reserved (this is
around 15GB which are missing).
So yeah, this looks like a BIOS bug to me.
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