Re: QEMU vs KVM

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

gerryw-dHy0zPTSVEVBDgjK7y7TUQ@public.gmane.org wrote:
>
> Hi,
>
> Thanks! Sorry. Yes. I meant kqemu.
>
> Okay.. so would it be correct to say that kqemu formed the initial 
> base of what is now kvm/kvm_intel/kvm_amd 

No.

> and that the mods to qemu are necessary for interfacing to the kernel 
> drivers and possibly some paravirtualized drivers for enhanced I/O 
> performance?

Yes.

>
> Also.. when you say that kvm is part of the linux kernel do you mean 
> 2.6.20 and above?

Yes.

> Are the modules no longer necessary for the .20+ kernels?

They are included in .20+.

>
> I know your very busy. I really appreciate your taking the time to 
> answer my questions.
>
> Thanks Again,
> -G
>
>
>
>
>
>  
>
>
> *Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>*
>
> 09/12/2007 04:04 AM
>
> 	
> To
> 	gerryw-dHy0zPTSVEVBDgjK7y7TUQ@public.gmane.org
> cc
> 	kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
> Subject
> 	Re: [kvm-devel] QEMU vs KVM
>
>
>
> 	
>
>
>
>
>
> gerryw-dHy0zPTSVEVBDgjK7y7TUQ@public.gmane.org wrote:
> >
> > Hello All,
> >
> > I am a bit unclear about the differences between QEMU and KVM. If I
> > understand correctly, QEMU can run in a mode on an x86 where it
> > executes user space code directly on the cpu without emulation. This
> > seems to be very similar to what KVM is doing with the exception of
> > using the virtualization capability of the cpu. I would think there
> > would be very little difference in performance between the two in this
> > case. Please forgive my ignorance, because I don't know that much
> > about the new VT cpus yet. What is the actual difference / objective
> > of the KVM project?
>
> You're describing kqemu, not qemu.
>
> Qemu is an emulator; it can emualte a large number of guests on a large
> number of hosts, albeit at fairly slow speeds.
>
> kqemu is a "qemu accelerator" which can be used to speed up qemu
> emulation if the guest and host are the same.
>
> kvm is a hardware virtualization system that is part of the Linux
> kernel.  While at present the only serious user is a modified qemu, it
> is not tied to qemu.  It is faster than either qemu of kqemu.  The
> downside is that it requires hardware virtualization extensions for
> fully virtualized guests.
>
>
>
> -- 
> error compiling committee.c: too many arguments to function
>
>


-- 
error compiling committee.c: too many arguments to function


-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/