Xen users - Nov 2010 - Scrubbing free ram... reboots

Hi,

I''m testing a Debian Squeeze with Xen 4.0.1 in a machine with 32GB of 
RAM. If I setup dom0_mem=16G or less, I get a backtrace during 
"scrubbinf free ram" and then reboots.

Is there any limitation in the amount of free ram? I googled a lot and I 
didn''t find thje solution, any idea?

Thanks in advance,

Quimi


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Does this happen when you set /dom0_max_vcpus/ too?

Cheers,
Alex
> Hi,
>
> I''m testing a Debian Squeeze with Xen 4.0.1 in a machine with 32GB
of
> RAM. If I setup dom0_mem=16G or less, I get a backtrace during 
> "scrubbinf free ram" and then reboots.
>
> Is there any limitation in the amount of free ram? I googled a lot and 
> I didn''t find thje solution, any idea?
>
> Thanks in advance,
>
> Quimi
>
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users


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Yes, I tried with "nosmp" and dom0_max_vcpus equal to 1, 2 and 4. And
I
get the same result. The machine is a dual quad core (with 
hyperthreading 16vcpus) and 32GB RAM. I don''t know where is the problem
but it''s curious that the problem happens when I decrease dom0_mem
under
the half of total memory.

Each quad core has 4 dimms of 4GB each (total 16GB), could be possible 
tha if I decrease dom0_mem under 16GB one physical processor runs out of 
memory?

Could be possible a bug while xen is scrubbing 16GB of free ram?

It''s possible to skip this part (scrubbing free ram) to test if the 
problems continue?

Thanks,
Quimi

 >Does this happen when you set /dom0_max_vcpus/ too?
>
>Cheers,
>Alex
> Hi,
>
> I''m testing a Debian Squeeze with Xen 4.0.1 in a machine with 32GB
of
> RAM. If I setup dom0_mem=16G or less, I get a backtrace during 
> "scrubbinf free ram" and then reboots.
>
> Is there any limitation in the amount of free ram? I googled a lot and 
> I didn''t find thje solution, any idea?
>
> Thanks in advance,
>
> Quimi
-- 
JOAQUIM FERNÁNDEZ
Serveis Informàtics TSC
Tel. 934011067 / 934011845

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08034 BARCELONA



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