Re: KVM RAM limitation

[Daniel Bareiro <daniel-listas@gmx.net>]

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Hi, Anthony.

On Wednesday, 03 February 2010 13:20:12 -0600,
Anthony Liguori wrote:

>>> Are you sure you enabled KVM? Are you sure you are using the KVM
>>> binary and not some QEMU binary that's sitting around. This is one
>>> of those situations where the KVM command you are running might
>>> help.  Also the same binary you are running's version ($QEMU_BIN -h
>>> | head -n1)
      
>> wilson:/usr/local/qemu-kvm/bin# ./qemu-system-x86_64 -h | head -n1
>> QEMU PC emulator version 0.12.2 (qemu-kvm-0.12.2), Copyright (c) 2003-2008 Fabrice Bellard
>>
>>
>> The procedure that I used to compile qemu-kvm is the same of always:
>> to download qemu-kvm-0.12.2, to install the packages (Debian)
>> zlib1g-dev and libpci-dev, and to compile of the following way:
>>
>> # cd qemu-kvm-0.12.2
>> # ./configure --prefix=/usr/local/qemu-kvm
>> # make
>> # make install
>>
>> Until the moment I never got to use qemu-kvm with VMs of more than
>> 2048 MB. In an installation that I have with KVM-88 and kernel x86_64
>> I don't have this problem.

> QEMU and KVM only support 2GB of memory on a 32-bit host.
>
> Both need to create a userspace mapping of the guests memory.  In a
> 32-bit environment, you only have enough usable address space in a
> process to create a 2GB region.

But, according to what I read in the link [1] that commented, just by to
have a x86_64 kernel would have to be sufficient to serve more than 2047
MB of RAM.

Regards,
Daniel

[1] https://help.ubuntu.com/community/KVM/Installation#Use%20a%2064%20bit%20kernel%20if%20possible
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