Re: [Xen-devel] RE:2Gb Memory lost in 2.6.32.36 - 50G memory, maxmem=50G, 2G used for pagetable, clamping (max:5G) is not helping.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

> > What happens if you provide dom0_mem=max:5G to clamp on the size?
> > 
>  
> Seems nothing different(what is clamp means? ^_^ )

http://en.wikipedia.org/wiki/Clamp_(tool)

.. snip..
>  Xen: 0000000100000000 - 0000000c6ff09000 (usable)
> DMI present.
> AMI BIOS detected: BIOS may corrupt low RAM, working around it.
> last_pfn = 0xc6ff09 max_arch_pfn = 0x400000000
.. snip..
> xen_commandline        : msi=1 iommu=off x2apic=off console=com1,vga 
> com1=115200,8n1 noreboot dom0_mem=max:5G dom0_max_vcpus=4 dom0_vcpus_pin 
> cpuidle=0 cpufreq=none xsave=0

OK, I would have expected your last entry in the E820 to be truncated
to 15fe00000, but it is not with the max:5G parameter. Looks like
you found a bug - but I am not sure if it is the Xen hypervisor or
the E820 parsing code in Linux. Fortunatly for you, I just got my hands on 32G
machine so I can work on this. Can you remind me in a week if I you do
not see any patches from me?

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