Hang when starting a 256GB PV guest.

Hang when starting a 256GB PV guest.

[xiaowei hu]

Hi all,

I was using xen 3.4.0 ,32bit dom0 to do some test on a 1TB memory
system.When tring to boot a 256GB PV guest(both EL4 and EL5),it just
hang after the domain builder completed it work.

Is it tested for 256GB PV guest? Anyone ever do this successfully? And
any suggestions?

Thanks,
xiaowei

RE: Hang when starting a 256GB PV guest.

[Yi, Shunli]

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32-bits Xen only support 16GB memory at most.
I think to support 256GB memory, you have to use a 64-bits Xen at least.

Fix me if I'm wrong.

-Shunli

-----Original Message-----
From: xen-devel-bounces@lists.xensource.com [mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of xiaowei hu
Sent: 2010年7月9日 16:45
To: xen-devel
Cc: xiaowei.hu@oracle.com
Subject: [Xen-devel] Hang when starting a 256GB PV guest.

Hi all,

I was using xen 3.4.0 ,32bit dom0 to do some test on a 1TB memory
system.When tring to boot a 256GB PV guest(both EL4 and EL5),it just
hang after the domain builder completed it work.

Is it tested for 256GB PV guest? Anyone ever do this successfully? And
any suggestions?

Thanks,
xiaowei


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Re: Hang when starting a 256GB PV guest.

[Jan Beulich]

>>> On 09.07.10 at 10:44, xiaowei hu <xiaowei.hu@oracle.com> wrote:
> I was using xen 3.4.0 ,32bit dom0 to do some test on a 1TB memory
> system.When tring to boot a 256GB PV guest(both EL4 and EL5),it just
> hang after the domain builder completed it work.
> 
> Is it tested for 256GB PV guest? Anyone ever do this successfully? And
> any suggestions?

Doing this with a 32-bit Dom0 seems odd at best, but it should
(theoretically) work. Do you see the same with a 64-bit Dom0?
Did you analyze where the guests hang (i.e. whether their kernel
has an issue with that amount of memory)?

Jan

Re: Hang when starting a 256GB PV guest.

[xiaowei hu]

On Fri, 2010-07-09 at 09:55 +0100, Jan Beulich wrote:
> >>> On 09.07.10 at 10:44, xiaowei hu <xiaowei.hu@oracle.com> wrote:
> > I was using xen 3.4.0 ,32bit dom0 to do some test on a 1TB memory
> > system.When tring to boot a 256GB PV guest(both EL4 and EL5),it just
> > hang after the domain builder completed it work.
> > 
> > Is it tested for 256GB PV guest? Anyone ever do this successfully? And
> > any suggestions?
> 
> Doing this with a 32-bit Dom0 seems odd at best, but it should
> (theoretically) work. Do you see the same with a 64-bit Dom0?
> Did you analyze where the guests hang (i.e. whether their kernel
> has an issue with that amount of memory)?
yes,64-bit Dom0 also has this problem.
Even the pygrub menu did not show up,it hang there.


> 
> Jan
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

Re: Hang when starting a 256GB PV guest.

[Jan Beulich]

>>> On 09.07.10 at 11:04, xiaowei hu <xiaowei.hu@oracle.com> wrote:
> On Fri, 2010-07-09 at 09:55 +0100, Jan Beulich wrote:
>> >>> On 09.07.10 at 10:44, xiaowei hu <xiaowei.hu@oracle.com> wrote:
>> > I was using xen 3.4.0 ,32bit dom0 to do some test on a 1TB memory
>> > system.When tring to boot a 256GB PV guest(both EL4 and EL5),it just
>> > hang after the domain builder completed it work.
>> > 
>> > Is it tested for 256GB PV guest? Anyone ever do this successfully? And
>> > any suggestions?
>> 
>> Doing this with a 32-bit Dom0 seems odd at best, but it should
>> (theoretically) work. Do you see the same with a 64-bit Dom0?
>> Did you analyze where the guests hang (i.e. whether their kernel
>> has an issue with that amount of memory)?
> yes,64-bit Dom0 also has this problem.
> Even the pygrub menu did not show up,it hang there.

So you say the kernel doesn't even get control? Iirc someone else at
Oracle got this to work quite a while ago - you may want to search
the xen-devel archives...

Jan