[Qemu-devel] Qemu Questions

[Qemu-devel] Qemu Questions

[admin]

I must apologize for subscribing to this list, but the Qemu users list 
is dead, sop this is my only option.
I understand it is a development list, but I would appreciate some help.

I will make it concise.

1) What is the best Distro to run Qemu on with the least hassles?
FYI, I now run it on FC7, but it is a lot of trouble. kqemu refuses to 
work on FC7 on a v20z Sun dual cpu dual core rack server
XEN just completely doesnt load even though  the Kernel is XEN, but at 
least qemu works with the following Caveat;
"Could not open '/dev/kqemu' - QEMU acceleration layer not activated"

2)  Does an activated QEMU acceleration layer (missing above)  make a 
huge difference?

3) I have several operating systems successfully loaded in Qemu 
sessions, but networking is just not working. I worked through loads of  
FAQs from the net, but to no avail.

4) Finally is there a preferred distro which is known to solve all the 
problems mentioned above?

Thanks.

Re: [Qemu-devel] Qemu Questions

[Daniel P. Berrange]

On Fri, Nov 09, 2007 at 08:42:52PM -0500, admin@mmri.us wrote:
> I must apologize for subscribing to this list, but the Qemu users list 
> is dead, sop this is my only option.
> I understand it is a development list, but I would appreciate some help.
> 
> I will make it concise.
> 
> 1) What is the best Distro to run Qemu on with the least hassles?
> FYI, I now run it on FC7, but it is a lot of trouble. kqemu refuses to 
> work on FC7 on a v20z Sun dual cpu dual core rack server
> XEN just completely doesnt load even though  the Kernel is XEN, but at 
> least qemu works with the following Caveat;
> "Could not open '/dev/kqemu' - QEMU acceleration layer not activated"

As a general rule (with a couple of exception) Fedora only ships kernel
modules which are in upstream LKML sources. kqemu is not upstream, so it
is not included in Fedora RPMs for QEMU.

> 2)  Does an activated QEMU acceleration layer (missing above)  make a 
> huge difference?

Yes, it improves performance signficantly - although not all OS will run
under kqemu.

> 3) I have several operating systems successfully loaded in Qemu 
> sessions, but networking is just not working. I worked through loads of  
> FAQs from the net, but to no avail.

With Fedora 7 you can try  'virt-manager' which will let you setup QEMU
guests, which by default have NAT'd access to the outside world. If you
setup your host network in appropriate manner they can also be bridged
In this doc where you see 'kvm' - 'qemu' applies  just the same way

http://watzmann.net/blog/index.php/2007/04/27/networking_with_kvm_and_libvirt

The main potential gotcha I know is that ip_forward must be enabled

eg, 

$ /sbin/sysctl net.ipv4.ip_forward
net.ipv4.ip_forward = 1


> 4) Finally is there a preferred distro which is known to solve all the 
> problems mentioned above?

Networking should work correctly for NAT & bridging (assuming suitable host
config). KQEMU won't work in Fedora since the module is not upstream.

Regards,
Dan.
-- 
|=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
|=-           Perl modules: http://search.cpan.org/~danberr/              -=|
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Re: [Qemu-devel] Qemu Questions

[Jonathan Kalbfeld]

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Apologizing is a sign of weakness.  That's one of the rules on NCIS.


On 11/9/07, admin@mmri.us <admin@mmri.us> wrote:
>
> I must apologize for subscribing to this list, but the Qemu users list
> is dead, sop this is my only option.
> I understand it is a development list, but I would appreciate some help.
>
> I will make it concise.
>
> 1) What is the best Distro to run Qemu on with the least hassles?
> FYI, I now run it on FC7, but it is a lot of trouble. kqemu refuses to
> work on FC7 on a v20z Sun dual cpu dual core rack server
> XEN just completely doesnt load even though  the Kernel is XEN, but at
> least qemu works with the following Caveat;
> "Could not open '/dev/kqemu' - QEMU acceleration layer not activated"


1/ I absolutely love it on Solaris.  Mainly because I am a Solaris bigot.
Barring that it should run relatively uniformly on different Linuxi.


2)  Does an activated QEMU acceleration layer (missing above)  make a
> huge difference?


Yep.  Seems to be about 5x faster on my 1.6Ghz celeron laptop.


3) I have several operating systems successfully loaded in Qemu
> sessions, but networking is just not working. I worked through loads of
> FAQs from the net, but to no avail.



Try adding -net nic,model=rtl8139 -net user

Use DHCP if you can.


4) Finally is there a preferred distro which is known to solve all the
> problems mentioned above?


Surely you can't be serious. :)  (Yes, I know, don't call you Shirley)



Thanks.
>
>
>
>


-- 
--
Jonathan Kalbfeld
ThoughtWave Technologies LLC
www.thoughtwave.com
+1 323 620 6682

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Re: [Qemu-devel] Qemu Questions

[admin]

Daniel, thanks for the kind answer.

Do you know which distro would be easiest to configure  kqemu in or has 
kqemu accessible through yum repos ?

Thanks

Re: [Qemu-devel] Qemu Questions

[admin]

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Re: [Qemu-devel] Qemu Questions

[admin]

What I pasted in the Appendix are the the Xen output, when I still tried 
Xen, Just ignore.