Re: [Xen-ia64-devel] sparsemem/discontig?

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 28 Septembre 2006 11:50, Jes Sorensen a écrit :
> Tristan Gingold wrote:
> > Le Mardi 26 Septembre 2006 10:24, Jes Sorensen a écrit :
> >> Hmmm, so why did it make no difference whether I changed those
> >> addresses?
> >
> > This is not an early crash.  Xen boots rather far before crashing.
> >
> >> Any idea if there's some hard coded places that I need to track down?
> >
> > I don't know the altix at all.  It seems the memory is very sparse.
> > Have you post the boot log ?
>
> Salut Tristan,
>
> Looks like someone got the physical address wrong when he changed the
> define (also known as error code 40, located 40cm from the screen).
> After I set it to the correct address it gets much further, however this
> underlines the issue of having to fix relocation of the physical
> addresses in TLB handlers etc. Guess I know what I'll be doing for the
> next couple of days :)
Changing the physical loading address shouldn't that hard.

I'd suggest you *not* working on relocation yet.

According to page_alloc.c, the allocator needs a bitmap for memory.  This 
bitmap is not sparse.  I suppose this is a major issue for Altix to be fixed.

Tristan.

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