Re: [Xen-users] 4GB memory installed, 3.5GB shown (Xen 3.2 + PAE)

["Brian A. Seklecki" <lavalamp@xxxxxxxxxxxxxxxxxxxxxx>]

On Tue, 2008-03-11 at 12:48 +0100, Wouter de Geus wrote:
> Hello,
> 
> I have recently upgraded one of my machines, both in hardware and Xen version.
> In the old situation it had 3GB of memory and Xen 3.1, worked like a charm.
> After upgrading it has 4GB of memory and Xen 3.2.
> 
> However, only 3.5GB of the memory is available to xen.
> (xm info gives
>   total_memory           : 3573 )


Google something called PAE.  Then reinstall the amd64 / x86_64 version
of your distro.  Maybe include "uname -a" output when reporting bugs?

~BAS


> I've read about the grub 0.97 bug, so I patched it.
> However, that has absolutely no effect.
> 
> Grub output:
> grub> displaymem 
>  EISA Memory BIOS Interface is present
>  Address Map BIOS Interface is present
>  Lower memory: 640K, Upper memory (to first chipset hole): 3072K
>  [Address Range Descriptor entries immediately follow (values are 64-bit)]
>    Usable RAM:  Base Address:  0x0 X 4GB + 0x0,
>       Length:   0x0 X 4GB + 0xa0000 bytes
>    Reserved:  Base Address:  0x0 X 4GB + 0xa0000,
>       Length:   0x0 X 4GB + 0x60000 bytes
>    Usable RAM:  Base Address:  0x0 X 4GB + 0x100000,
>       Length:   0x0 X 4GB + 0x300000 bytes
> 
> >From xm dmesg:
> (XEN) Xen-e820 RAM map:
> (XEN)  0000000000000000 - 000000000009fc00 (usable)
> (XEN)  000000000009fc00 - 00000000000a0000 (reserved)
> (XEN)  00000000000e0000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 00000000df65b000 (usable)
> (XEN)  00000000df65b000 - 00000000df6e8000 (ACPI NVS)
> (XEN)  00000000df6e8000 - 00000000df6ec000 (usable)
> (XEN)  00000000df6ec000 - 00000000df6ff000 (ACPI data)
> (XEN)  00000000df6ff000 - 00000000df700000 (usable)
> (XEN) System RAM: 3573MB (3659772kB)
> 
> Does anyone have any idea what might make those extra 500-ish MBs available 
> to Xen? :)
> 
> Thanks for reading.
> 
> Wouter.


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