From: Michal Hocko <mhocko@suse.cz>
To: Doug Morse <dm@dougmorse.org>
Cc: linux-mm@kvack.org
Subject: Re: lshw sees 12GB RAM but system only using 8GB
Date: Tue, 27 May 2014 14:36:29 +0200 [thread overview]
Message-ID: <20140527123629.GB22092@dhcp22.suse.cz> (raw)
In-Reply-To: <53836B51.5020105@dougmorse.org>
On Mon 26-05-14 11:26:57, Doug Morse wrote:
[...]
> [ 0.000000] e820: BIOS-provided physical RAM map:
> [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009e7ff] usable
> [ 0.000000] BIOS-e820: [mem 0x000000000009e800-0x000000000009ffff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved
> [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000ae482fff] usable
> [ 0.000000] BIOS-e820: [mem 0x00000000ae483000-0x00000000aea40fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000aea41000-0x00000000aee38fff] ACPI NVS
> [ 0.000000] BIOS-e820: [mem 0x00000000aee39000-0x00000000af158fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000af159000-0x00000000af159fff] usable
> [ 0.000000] BIOS-e820: [mem 0x00000000af15a000-0x00000000af35ffff] ACPI NVS
> [ 0.000000] BIOS-e820: [mem 0x00000000af360000-0x00000000af7fffff] usable
> [ 0.000000] BIOS-e820: [mem 0x00000000f8000000-0x00000000fbffffff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fec00000-0x00000000fec00fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fec10000-0x00000000fec10fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fec20000-0x00000000fec20fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fed00000-0x00000000fed00fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fed61000-0x00000000fed70fff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fed80000-0x00000000fed8ffff] reserved
> [ 0.000000] BIOS-e820: [mem 0x00000000fef00000-0x00000000ffffffff] reserved
> [ 0.000000] BIOS-e820: [mem 0x0000000100001000-0x000000024fffffff] usable
> [ 0.000000] NX (Execute Disable) protection: active
> [ 0.000000] SMBIOS 2.7 present.
> [ 0.000000] DMI: Gigabyte Technology Co., Ltd. To be filled by O.E.M./970A-UD3, BIOS FC 01/28/2013
> [ 0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
> [ 0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
> [ 0.000000] No AGP bridge found
> [ 0.000000] e820: last_pfn = 0x250000 max_arch_pfn = 0x400000000
last_pfn (last page frame number) is 0x250000 which means that ~9GB
worth of pages can be present at maximum. The value is derived from
the e820 map provided by the kernel. So I would check the BIOS why it
doesn't tell the system about addresses above 9GB.
I am not familiar with lshw to tell you why it sees more memory.
--
Michal Hocko
SUSE Labs
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prev parent reply other threads:[~2014-05-27 12:36 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-25 22:42 Doug Morse
2014-05-26 8:14 ` Michal Hocko
2014-05-26 16:26 ` Doug Morse
2014-05-27 12:36 ` Michal Hocko [this message]
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