From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: RE:2Gb Memory lost in 2.6.32.36 - 50G memory,
	maxmem=50G, 2G used for pagetable, clamping (max:5G) is not helping.
Date: Tue, 31 May 2011 10:44:21 -0400
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To: MaoXiaoyun <tinnycloud@hotmail.com>
Cc: jeremy@goop.org, xen devel <xen-devel@lists.xensource.com>
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On Tue, May 31, 2011 at 04:33:52PM +0800, MaoXiaoyun wrote:
> 
> Hi Konrad;
>  
>       I realized that in 32.36 kernel dom0 can balloon up to use whole memory address, in my case it is 48G. But it consumes 845M memory 
> for sparse memory to manage them, Well, my dom0 doesn't need so big flexable,  and I learnt that use "mem=" option in grub can limit 
> dom0 memory, I think it works for me now.  

HA! That does it too.
>  
> Any comments?

>  
> title Red Hat Enterprise Linux Server (2.6.32.36xen)
>         root (hd0,0)
>         kernel /xen-4.0.1.gz  iommu=off x2apic=off console=com1,vga com1=115200,8n1 noreboot dom0_mem=6144M dom0_max_vcpus=4 dom0_vcpus_pin cpuidle=0 cpufreq=none 
>         module /vmlinuz-2.6.32.36xen ro root=LABEL=/ hda=noprobe console=hvc0 mem=8192M
>         module /initrd-2.6.32.36xen.img

That is a good work-around. Still need to fix the bug in the E820 setup code to take
dom0_mem=max: parameter under advisment.