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

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> Oh, I forgot to mention that ;)
>
> My first try I used a non-PAE 32 bit kernel.
> When I noticed the missing memory I figured I needed PAE.
>
> So now I'm using a 32 bit PAE enabled kernel. (and obviously I rebuilt Xen
> too).

Do you definitely know that normal PAE Linux *can* access all 4GB on this 
system?  On some systems the chipset makes it impossible to access the full 
4GB, with or without PAE :-(

Cheers,
Mark

> Wouter.
>
> * --[ UxBoD ]-- <uxbod@xxxxxxxxxxxx> [2008-03-11 16:48:35 +0000]:
> > 32bit or 64bit Dom0 O/S ?
> >
> > Regards,
> >
> > --
> > --[ UxBoD ]--
> > // PGP Key: "curl -s http://www.splatnix.net/uxbod.asc | gpg --import"
> > // Fingerprint: F57A 0CBD DD19 79E9 1FCC A612 CB36 D89D 2C5A 3A84
> > // Keyserver: www.keyserver.net Key-ID: 0x2C5A3A84
> > // Phone: +44 845 869 2749 SIP Phone: uxbod@xxxxxxxxxxxxxxxx
> >
> > ----- "Wouter de Geus" <benv-xensource.com@xxxxxxxxxxxxx> wrote:
> > > Hello,
> > >
> > > (second attempt in sending this, messed up my from header ;))
> > >
> > > 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 )
> > >
> > > 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
> >
> > --
> > This message has been scanned for viruses and
> > dangerous content by MailScanner, and is
> > believed to be clean.



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