Re: [Xen-users] Xen 3 not seeing the right amount of RAM on x86_64

["Robert A. Klahn" <xen-users@xxxxxxxx>]

Chuck:

If you are running into this problem under Fedora, can you please
mention it in this bug report:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=250299

If enough people pile on, maybe this will get fixed in a future release.
:)

Thanks....Bob.


On Fri, 30 Nov 2007 16:54:33 -0500 (EST),
xen-users-request@xxxxxxxxxxxxxxxxxxx said:
> Message: 1
> Date: Fri, 30 Nov 2007 11:40:52 -0800
> From: "Chuck McIntyre" <chuck.mcintyre@xxxxxxxxx>
> Subject: Re: [Xen-users] Xen 3 not seeing the right amount of RAM on
>       x86_64
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Message-ID:
>       <b62bf9fa0711301140i1d71cc6bs538af801798885d3@xxxxxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-2
> 
> On Nov 29, 2007 2:09 AM, Rafa³ Kupka <rkupka+Listy.Xen@xxxxxxxxxxxxx>
> wrote:
> > Hello,
> 
> Hi!
> 
> Thanks for your help, see my responses below.
> 
> > > (XEN) Physical RAM map:
> > > (XEN)  0000000000000000 - 000000000009dc00 (usable)
> > > (XEN)  0000000000100000 - 00000000dcff0000 (usable)
> > > (XEN) System RAM: 3535MB (3620404kB)
> > > (XEN) Xen heap: 14MB (14340kB)
> > > (XEN) found SMP MP-table at 000ff780
> > > (XEN) DMI present.
> >
> > Xen gets memory map from grub, unlike linux[1].
> 
> Do you have a reference for this? Is this intentional? My
> understanding is that grub doesn't have any way to map around PCI BIOS
> created RAM holes because it is such a low level (boot) piece of
> software. Is this, then, a bug? Is there a way around it?
> 
> > Yes, it's this strange bug in grub I spot some time ago.
> > Please look at Debian bug #419994:
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=419994
> 
> I'm not sure it's a grub bug though, since it works correctly in a
> non-xen kernel.
> 
> Should I try a different boot loader?
> 
> > Can you try patch (with volatile unsigned long cont) and tell if it make
> > any difference?[2]
> 
> Will try this, and see, just to be sure, in the meantime, if you could
> provide reference for your assertion that Xen uses the boot loader to
> get its RAM map, that would be very helpful.
> 
> Thanks again,
> Chuck
> 
-----------------------------------------------------------
Robert A. Klahn         robert@xxxxxxxx         AIM: rklahn

"Hope has two beautiful daughters: Anger and Courage. Anger
 at the way things are, and Courage to struggle to create 
 things as they should be." -- St. Augustine


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