Xen users - Aug 2005 - Options for >4GB setups

Hi, everyone

I know that this has been asked to death on the list, and in the past
few days I''ve been trying to see if there were other options for
getting a xen host to use more than 4GB of RAM.

I''ve tried xen-unstable x86_64 on Xeon EM64Ts as well as xen-unstable
with the initial PAE support but neither got me too far from booting:
the former hangs when using the supplied binaries in
xen-unstable-x86_64 and the latter a known bug at domain_build.c:327.

And I know that the developers (who are really hard at work) have said
that xen 3.0 may be coming out really soon now, but was wondering if
there were anys suggestions for the impatient ones. ;-)

Many thanks!

- gino

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> I know that this has been asked to death on the list, and in the past
> few days I''ve been trying to see if there were other options for
> getting a xen host to use more than 4GB of RAM.
Under Xen 2.0, I''m afraid you''re stuck. 
xen-unstable''s support for >4Gig is
coming along nicely, though.
> I''ve tried xen-unstable x86_64 on Xeon EM64Ts as well as
xen-unstable
> with the initial PAE support but neither got me too far from booting:
> the former hangs when using the supplied binaries in
> xen-unstable-x86_64 and the latter a known bug at domain_build.c:327.
> And I know that the developers (who are really hard at work) have said
> that xen 3.0 may be coming out really soon now, but was wondering if
> there were anys suggestions for the impatient ones. ;-)
Patience, study the teachings of Xen and you will achieve enlightenment.  
Ooops, that''s the wrong [ZX]en :-)  Try the latest revision /
tomorrow''s
snapshot (Keir checked in a fix today that corrected several known bugs) and 
see if that improves things for you.

Cheers,
Mark

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I have forgotten. is xen itself ok with managing more than 4gig of memory?
And it is just the individual guests (including dom0) that are limited to
4 gig?

-Tom


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>I have forgotten. is xen itself ok with managing more than 4gig of memory?
>And it is just the individual guests (including dom0) that are limited to
>4 gig?
Nope; for > 4Gig physical memory you need either a PAE Xen (and PAE guests) 
or an x86_64 Xen (and x86_64 guests).

Cheers,
Mark

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Seems like there''s a lot of activity going on with x86_64. :-)

Today I got the latest seed archive to attempt to get a Dell SC1425
(Dual Xeon EM64T) up and running with Xen. Without trying the default
install, I tried building a with a custom kernel config and found out
that compiling in SMP and HyperThreading support causes the boot
process to barf. Rolling back to the default build, I get stuck with
an error pointing to:

arch/xen/x86_64/mm/hypervisor.c:64

BUG_ON(HYPERVISOR_mmu_update(&u, 1, NULL, DOMID_SELF) < 0);

Well, at least it got farther than my last attempt. :-)

-gino

On 8/10/05, Mark Williamson <mark.williamson@cl.cam.ac.uk>
wrote:
> > I know that this has been asked to death on the list, and in the past
> > few days I''ve been trying to see if there were other options
for
> > getting a xen host to use more than 4GB of RAM.
> 
> Under Xen 2.0, I''m afraid you''re stuck. 
xen-unstable''s support for >4Gig is
> coming along nicely, though.
> 
> > I''ve tried xen-unstable x86_64 on Xeon EM64Ts as well as
xen-unstable
> > with the initial PAE support but neither got me too far from booting:
> > the former hangs when using the supplied binaries in
> > xen-unstable-x86_64 and the latter a known bug at domain_build.c:327.
> > And I know that the developers (who are really hard at work) have said
> > that xen 3.0 may be coming out really soon now, but was wondering if
> > there were anys suggestions for the impatient ones. ;-)
> 
> Patience, study the teachings of Xen and you will achieve enlightenment.
> Ooops, that''s the wrong [ZX]en :-)  Try the latest revision /
tomorrow''s
> snapshot (Keir checked in a fix today that corrected several known bugs)
and
> see if that improves things for you.
> 
> Cheers,
> Mark
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
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