Re: I'm having 4GB RAM, but Linux sees just 3GB???

[Christian Parpart <trapni@gentoo.org>]

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On Monday 16 May 2005 4:44 pm, Brian Gerst wrote:
> Christian Parpart wrote:
> > Hi all,
> >
> > I was asking this in gentoo-server mailing list before, however, they
> > finally pointed me to this place as it could also be a bug in the kernel.
> >
> > I'm having a TYAN board with two AMD Opteron 248 and 4x 1GB ECC RAM on
> > it. The BIOS reflects what I've plugged in, however, the operating system
> > does not.
> >
> > my `uname -a` output is:
> > Linux battousai 2.6.11-gentoo-r8 #1 SMP Sat May 14 02:42:15 CEST 2005
> > x86_64 AMD Opteron(tm) Processor 248 AuthenticAMD GNU/Linux
> >
> > and my `dmidecode` output is located at [0]. For ANY reason, dmidecode
> > even knows about my 4GB RAM, but `free -m` nor `kinfocenter` of KDE
> > claims to see just 3GB.
> >
> > free -m:
> >              total       used       free     shared    buffers     cached
> > Mem:          3015       2993         22          0         15       2638
> > -/+ buffers/cache:        338       2677
> > Swap:          511          1        510
> >
> > This is rather sad to see 1GB RAM plugged in for nothing.
> >
> > Has anyone a hint for my WHY this is happening and HOW I could get rid of
> > it?
> >
> > Thanks in advance,
> > Christian Parpart.
> >
> > [0] http://dev.gentoo.org/~trapni/dmidecode.txt
>
> Are you running a 64-bit kernel?  What does "dmesg | grep e820" show?

 BIOS-e820: 0000000000000000 - 0000000000094800 (usable)
 BIOS-e820: 0000000000094800 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000c2000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 00000000bff20000 (usable)
 BIOS-e820: 00000000bff20000 - 00000000bff2e000 (ACPI data)
 BIOS-e820: 00000000bff2e000 - 00000000bff80000 (ACPI NVS)
 BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fec00000 - 00000000fec00400 (reserved)
 BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
 BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved)

hmm... what does this mean?

Well, yeah, the whole system is 64bit compiled.

Regards,
Christian Parpart.

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