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Re: [Qemu-devel] -kernel-kqemu

From: G Portokalidis
Subject: Re: [Qemu-devel] -kernel-kqemu
Date: Fri, 10 Feb 2006 15:24:08 +0100

Does the copying of instructions occur in user-space or kernel-space?
I would like to port Argos to use the kernel accelerator, but i'm
unsure this is possible considering the accelerator is not open

If the `parsing' and copying of instructions occurs in user-space, i
could instead of instrumenting instructions, have the necessary
actions packed in a different block and executed in a pseudo-parallel

That will require trapping some instructions (like jmp, call, etc),
which i'm not sure is possible unless you have access to the kernel

Any insight on how the kernel accelerator works?

BTW, Fabrice could you add a link to argos
(http://www.few.vu.nl/argos) on your website? It is a child of qemu
anyway :-)

On 10/02/06, Phil Krylov <address@hidden> wrote:
> On 10/02/06, Anthony Liguori <address@hidden> wrote:
> > Jim C. Brown wrote:
> > > -kernel-kqemu virtualizes ring 0 code.
> > >
> > > So it basically makes qemu do what VMware does.
> > >
> > > IIRC someone reported a 33% speedup with the new option.
> > >
> > That was me.  That was a 33% speedup on win2k startup time.  kqemu (user
> > only) has a negligible impact on win2k startup time which suggests this
> > is mostly ring 0 code running which would make it a good benchmark for
> > kernel-kqemu performance.
> >
> > This was a terribly unscientific benchmarking so don't read too much
> > into it.
> I am experiencing a huge (~5 times)  speedup in compilers and linkers.
> Great ;))))
> -- Ph.
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