Re: [Xen-users] RHEL 5.2 i386 image - Xen kernel doesn't recognize the total amount of system memory

[Ido Levy <IDOL@xxxxxxxxxx>]

Tom,

Thanks for the info.

Do you know if RHEL 4.5/6 32 bit image Xen kernel supports more than 16GB
of RAM ?

Ido Levy



                                                                           
             Tom Georgoulias                                               
             <tomg@mcclatchyin                                             
             teractive.com>                                             To 
                                       Ido Levy/Haifa/IBM@IBMIL            
             28/07/2008 23:45                                           cc 
                                       xen-users@xxxxxxxxxxxxxxxxxxx,      
                                       Alexandra Kisin/Haifa/IBM@IBMIL     
                                                                   Subject 
                                       Re: [Xen-users] RHEL 5.2 i386 image 
                                       - Xen kernel doesn't recognize the  
                                       total amount of system memory       
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Ido Levy wrote:

> We have installed RHEL 5.2 Server ( i386 image ) on a machine with 64GB
of
> RAM.
>
> When booting the default PAE kernel ( 2.6.18-92.el5PAE ) that is shipped
> with RHEL 5.2 installation the OS detects 64GB of RAM.
> But when booting the Xen kernel ( 2.6.18-92.el5xen ) the OS detects only
> 14GB of the total amount of available RAM.
>
> Did anyone encounter this problem before ?

I did when I first installed RHEL5.1 on a server with 32GB of RAM.

> Is it a normal behavior for a 32 bit image ?

Yes, 32-bit supports up to 16GB.  To use the rest of the RAM, you'd need
to install the 64-bit kernel-xen.  Some docs are here:

https://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/en-US/RHEL510/Virtualization_Guide/ch-virt-hw-support.html


Hope that helps.

Tom



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