Quoting Neil Hunt (695...@bugs.launchpad.net):
> Sean,
>
> how can I enable KVM Acceleration? I am actually getting very poor
> performance from Ubuntu KVM at the moment. Running on a 24-core server
> with 64gb ram, but my guests are running very slowly. Is there
Ah, then the two most likely problems are that (a) it is turned off
in the bios, or (b) the xml is defined to not use it. To check for (b),
if you do 'virsh edit <domainname>', make sure the emulator line is
<emulator>/usr/bin/kvm</emulator>
and not
<emulator>/usr/bin/qemu</emulator>
Also either check the bios settings, or you can use the program 'sudo kvm-ok'.
If it says 'KVM acceleration can be used', then the bios is not the problem.
> anything I can do to improve this? Also, if I enable this somehow,
> does this fix the 4gb ram limit or do I need to apply a patch?
Yes, enabling kvm acceleration will remove the 4Gb limit for you.
-serge
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https://bugs.launchpad.net/bugs/695825
Title:
Ubuntu KVM error with guest memory >4gb ram
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