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RE: [Xen-users] Problems with >4GB memory with 64-bit Xen kernel

To: "Matthew Ragan" <mdr@xxxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Problems with >4GB memory with 64-bit Xen kernel
From: "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>
Date: Tue, 27 May 2008 13:46:30 -0400
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Thread-topic: [Xen-users] Problems with >4GB memory with 64-bit Xen kernel
Matthew Ragan wrote:

> I've been running the 64-bit version of the Xen 3.1.4 hypervisor with  
> a NetBSD (recent -current) dom0 for a number of weeks now, and haven't  
> had any real problems with it.  Previously, the system that I am  
> running this on (Dell Dimension E510, Pentium D 940) has been running  
> fine with 1GB of memory in the system.  Because I want to use this  
> system to house a number of database VMs that may chew memory, I put  
> 8GB in the system today, and now the system refuses to boot unless I  
> specify 'mem=4G', which somewhat defeats the purpose of having 8GB in  
> the box.
> I know other people have more than 4GB in their running systems, and  
> NetBSD boots fine and finds all 8G when I boot it without using Xen,  
> so I'm not sure what the issue is.  I've tried this with a number of  
> different 3.1.0 and 3.2.x kernels, and all have similar problems.   
> Setting 'mem=' to other values above 4GB results in the same errors,  
> except for the ending value in the last (usable) line.
> Boot shows:
> (XEN) Command line: (hd0,3,a)/xen.gz dom0_mem=256m
> (XEN)  0000000000000000 - 0000000000000000 (usable)
> (XEN)  00000000000f0000 - 0000000000100000 (reserved)
> (XEN)  0000000000010000 - 00000000dfe88000 (usable)
> (XEN)  00000000dfe88c00 - 00000000dfe8ac00 (ACPI NVS)
> (XEN)  00000000dfe8ac00 - 00000000dfe8cc00 (ACPI data)
> (XEN)  00000000dfe8cc00 - 00000000e0000000 (reserved)
> (XEN)  00000000f0000000 - 00000000f4000000 (reserved)
> (XEN)  00000000fec00000 - 00000000fed00400 (reserved)
> (XEN)  00000000fed20000 - 00000000feda0000 (reserved)
> (XEN)  00000000fee00000 - 00000000fef00000 (reserved)
> (XEN)  00000000ffb00000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 0000000200000000 (usable)
> (XEN) System RAM: 7678MB (7862432kB)
> (XEN) Xen heap: 13MB (14032kB)
> (XEN) Domain heap initialised: DMA width 32 bits
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Early fatal page fault at e008:ffff8300001129d4  
> (cr2=ffffffffffffffff, ec=0002)
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
> (XEN) Unknown interrupt

You need to make sure the dom0 kernel is compiled PAE.


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