On 24-02-2011 17:07, C Anthony Risinger wrote: > hmm, soo qemu doesn't actually use the VT extensions? wtf is the > point then? this is what i don't understand; if qemu supports KVM via > the `-enable-kvm` switch why does it suck so much -- it seems just as > slow to me as no KVM support at all. I have a server that runs > several KVM/libvirt instances (windows being one of them purely for > ... i dont even know) so i'm pretty familiar with it all, but i'm just > trying to get solid info why there is such a huge performance gap when > the both "use KVM". i thought KVM itself did all the VT handling. > > C Anthony > AFAIK qemu-kvm is the 'plain' qemu patched to have a more up-to-date and complete kvm support. At least it's what is on the great arch wiki [1] :p There are also other small tweaks, such as kvm support being enabled by default in qemu-kvm so you don't need to specify -enable-kvm, it will still fallback to using emulation is kvm support is not found or can't be used. [1] https://wiki.archlinux.org/index.php/QEMU#Using_the_Kernel-based_Virtual_Machine -- Mauro Santos
