[Qemu-devel] qemu-smp guest on monoCPU host: big slowdown

[Qemu-devel] qemu-smp guest on monoCPU host: big slowdown

[octane indice]

Hello

I'm trying to use the new -smp option.
host: win2k
guest: linux 2.6.13-SMP

The first sight is a really big slowdown.
with -smp 2, the guest seems to go approximatively to 1/4 speed of a 
monoCPU guest.

I tried to boot with -smp 8, but it was so slow that I abandoned.

Am I doing something wrong? 
Is it unavoidable? Some options to use to compile qemu, or to 
compile the SMP kernel?

Thanks for all informations

---------------------------------------------
Alinto vous souhaite une très bonne année 2006 http://www.alinto.com

Re: [Qemu-devel] qemu-smp guest on monoCPU host: big slowdown

[Hetz Ben Hamo]

Do u use KQEMU?

Hetz

On 1/4/06, octane indice <octane@alinto.com> wrote:
> Hello
>
> I'm trying to use the new -smp option.
> host: win2k
> guest: linux 2.6.13-SMP
>
> The first sight is a really big slowdown.
> with -smp 2, the guest seems to go approximatively to 1/4 speed of a
> monoCPU guest.
>
> I tried to boot with -smp 8, but it was so slow that I abandoned.
>
> Am I doing something wrong?
> Is it unavoidable? Some options to use to compile qemu, or to
> compile the SMP kernel?
>
> Thanks for all informations
>
> ---------------------------------------------
> Alinto vous souhaite une très bonne année 2006 http://www.alinto.com
>
>
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel
>

Re: [Qemu-devel] qemu-smp guest on monoCPU host: big slowdown

[octane indice]

En réponse à Hetz Ben Hamo <hetzbh@gmail.com> :
> ------------------ Début du message d'origine --------------------
> 
> Do u use KQEMU?
> 
Host: win2k. 
AFAIK, there is no kqemu for windows.

some others observations:
kernel crash at shutdown. Anybody interested by a stack trace?


> Hetz
> 
> On 1/4/06, octane indice <octane@alinto.com> wrote:
> > Hello
> >
> > I'm trying to use the new -smp option.
> > host: win2k
> > guest: linux 2.6.13-SMP
> >
> > The first sight is a really big slowdown.
> > with -smp 2, the guest seems to go approximatively to 1/4
> speed of a
> > monoCPU guest.
> >
> > I tried to boot with -smp 8, but it was so slow that I
> abandoned.
> >
> > Am I doing something wrong?
> > Is it unavoidable? Some options to use to compile qemu, or
> to
> > compile the SMP kernel?
> >
> > Thanks for all informations


---------------------------------------------
Alinto vous souhaite une très bonne année 2006 http://www.alinto.com

Re: [Qemu-devel] qemu-smp guest on monoCPU host: big slowdown

[André Braga]

On 1/5/06, octane indice <octane@alinto.com> wrote:
> AFAIK, there is no kqemu for windows.

But oh, there is! And it works fine most of the time (I can always
make QEMU crash and hog all available CPU time AND become unkillable,
but it might have something to do with my particular setup and applied
patches, namely DMA busmaster and tap for win32). If you compile QEMU
yourself you can just put KQEMU in your source tree just fine. Other
than that, there are precompiled packages available somewhere (can't
quite remember where, Google is your friend) which include KQEMU.

Cheers,
A.


--
"I decry the current tendency to seek patents on algorithms. There are
better ways to earn a living than to prevent other people from making
use of one's contributions to computer science."
Donald Knuth