Re: [Xen-users] CentOS 4.0 as guest OS

[Sadique Puthen <sputhenp@xxxxxxxxxx>]

rishi pathak wrote:
> Hi Fajar
>
> On 12/5/07, *Fajar A. Nugraha* <fajar@xxxxxxxxxxxxx 
> <mailto:fajar@xxxxxxxxxxxxx>> wrote:
>     rishi pathak wrote:
>     > Hi ,
>     > The problem is that we have got a high speed interconnect and the
>     > driver for it was compiled for 2.6.9-5 EL.
>     > We have got only binaries of the driver and not source.For this
>     reason
>     > we have to stick to the said kernel.
>     >
>     You DO know a BINARY kernel module for normal linux kernel doesn't
>     work
>     on Xen PV kernel, right?
>
>
> I was not aware of that fact:(.Thanks for the information
>
>     The module itself must be recompiled. If you HAVE to use that
>     particular
>     version of the kernel (and not from RH 4.5, for example) then most
>     likely it won't work in PV guest.
>
>
> If I compile the module from within the  guest  It will work right?.
If you have the source for the module, then you can use the Dom-U kernel 
shipped with RHEL-4.5 or 4.6 and compile the module for that kernel.  
Then the new module should work then. The hassle free solution is to 
bargain with the vendor of the module either for the source code or new 
binaries compatible for 4.5/4.6 Dom-U kernel.
--Sadique

>     > Let me explain the scenario/problem for which we need
>     > virtualization.We have a compute cluster with nodes having 8GB of
>     > memory.The nodes are all dual socket single core Intel Xeon.The
>     driver
>     > for high speed interconnect can only work with 4GB of available
>     > RAM(i.e. it cannot see more than 4GB).If I restrict RAM to 4GB
>     then it
>     > would be a wastage.So the solution that came up was to divide node
>     > into two virtual machine and assign high speed interconnect to one
>     > virtual machine.Both machines will have 4GB.
>
>     Start here to run RHEL4 as PV guest
>     http://people.redhat.com/riel/RHEL4-Xen-HOWTO
>
>     I have a strong hunch your setup won't work though.
>     You might be able to use HVM domU instead, and (if the device is PCI)
>     use PCI passthrough. This way you should be able to use normal
>     RHEL4 kernel.
>
>
>  
> The nodes does not have support for Intel VT. What would be 
> performance degradation if I use HVM instead of PV.
> I tried with inserting module in 2.6.9-42  based domU...oops:kernel panic
>
>     Regards,
>
>     Fajar
>
>
>
> Regards --
> Rishi Pathak
>
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>
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