Re: [Xen-devel] Xen Hypervisor start fail when system memory more than 64GB, and free xen memory over 32 GB

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Aug 16, 2010 at 05:46:24PM +0800, benian wrote:
>    Hi Pasi
>    I finally boot up successfully by simply modified  the kernel config
>     item CONFIG_XEN_MAX_DOMAIN_MEMORY=32 to CONFIG_XEN_MAX_DOMAIN_MEMORY=128
>    (just choose a random value >72 ),
>    then rebuild the kernel-2.6.32 , and everything is ok.
>    By the way, i 've done many test and i finally found that
>    if unallocated memory(total - dom0 ) >32GB, boot up would be failed in my
>    environment.
>    for example, after I modified the kernel config, hypervisor boot normally
>    and dom0 get 72GB.
>    If i add dom0_mem= 32G(unallocated 40G) to grub option, hypervisor boot
>    fail again,
>    and if dom0_mem= 41G(unallocated 31G), hypervisor boot normally again.
>    So , might it be a problem of xen-4.0 that unable to handle unallocated
>    memory >32GB?
>

Sounds like a bug yeah.. How does it fail in the dom0_mem=32G case? What's the 
error? 

Can you please paste the full bootlog of the failing boot from a serial 
console? 
http://wiki.xensource.com/xenwiki/XenSerialConsole

-- Pasi


>    Regards,
>    Ben
>    2010/8/12 Pasi Kärkkäinen <[1]pasik@xxxxxx>
> 
>      On Thu, Aug 12, 2010 at 03:08:25PM +0800, benian wrote:
>      >
>      >
>      >    My environment is xen-4.0.0 + pvops2.6.32 kernel + fedora12
>      >
>      >    I can run xen hypervisor smoothly when system memory below 64G
>      >
>      >    But if I plug 4GB more memory to my server, XEN hypervisor start
>      fail then
>      >    crash and restart automatically.
>      >
>      >    The final screen is some message about memory address which will
>      not be
>      >    displayed in normal process
>      >
>      >
>      >
>      >    I read from XEN 4.0.0 features that Xen support 1 TB of RAM per
>      host, so I
>      >    am not sure what *s wrong with this situation.
>      >
>      >
>      >
>      >    Any idea is appreciated and welcome
>      >
>      >
> 
>      How much memory does your dom0 have? ie. what's your dom0_mem= option
>      for xen.gz in grub.conf.
>      Have you tried different values? ie. 2GB, 4GB, 8GB?
> 
>      Also setup a serial console so you can figure out if it's the Xen
>      hypervisor or dom0 kernel crashing:
>      [2]http://wiki.xensource.com/xenwiki/XenSerialConsole
> 
>      and more info about troubleshooting pvops dom0 kernels (also an example
>      about serial console with pvops dom0):
>      [3]http://wiki.xensource.com/xenwiki/XenParavirtOps
> 
>      Those should help.
>      -- Pasi
> 
> References
> 
>    Visible links
>    1. mailto:pasik@xxxxxx
>    2. http://wiki.xensource.com/xenwiki/XenSerialConsole
>    3. http://wiki.xensource.com/xenwiki/XenParavirtOps

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