Re: [Qemu-devel] -kernel-kqemu

[Fabrice Bellard]

Hi,

I just found the problem related to the -kernel-kqemu bug with win2k and 
'-m 256'. But fixing the bug is another matter !

Fabrice.

Brad Campbell wrote:
> Troy Benjegerdes wrote:
>
> > On Thu, Feb 09, 2006 at 04:01:34PM -0600, Anthony Liguori 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.
> > >
> > > Regards,
> > >
> > > Anthony Liguori
> >
> >
> > My win2k guest (with SP4, but not any updates) seemed to hang on startup
> > with -kernel-kqemu.
>
>
> Are you using -m 256 by any chance? I get this result with around that 
> much ram allocated to the guest. -m 160 (or less) or -m 384 (or more) 
> works perfectly here..