Re: virtio with 2.6.25-rc8: problem with /dev/vda

[Dor Laor <dor.laor@qumranet.com>]

On Thu, 2008-04-10 at 14:14 +0900, Jun Koi wrote:
> On 4/10/08, Jorge Lucángeli Obes <t4m5yn@gmail.com> wrote:
> > On Thu, Apr 10, 2008 at 12:59 AM, Jun Koi <junkoi2004@gmail.com> wrote:
> >  >  Now I succesfully installed 2.6.25-rc8, and virtio block device works
> >  >  well. But from inside my VM, how can I say it is using virtio for
> >  >  block?
> >  >
> >  >  And is there any number about the performance gain using virtio block?
> >  >
> >  >  Another question: currently I have some problem with network: I use option
> >  >
> >  >  "-net nic,model=virtio"
> >  >
> >  >  and try to configure VM from inside after booting, network doesnt
> >  >  work, even after I manually configure eth0.
> >  >
> >  >  How to fix that network problem?
> >
> >
> > '-net nic,...' only specifies the "hardware" part of QEMU/KVM's
> >  networking. You also need to specify whether you are going to use
> >  usermode networking or bridged networking. QEMU documentation covers
> >  both modes pretty well.
> >
> >  To test the card quickly, use usermode networking, where QEMU provides
> >  a usermode network stack (complete with DHCP server) that let's you
> >  use the VM as if it were behind a completely restrictive firewall that
> >  only allows outbound connections.
> >
> >  '-net nic,model=virtio -net user'
> >
> >  It's a great way to test the network card. If your host has an
> >  Internet connection, firing up a browser in the guest (after getting
> >  the guest interface up using DHCP) and accessing a web page should
> >  "just work".
> 
> "-net user" works, thanks!
> 

For general knowledge -net tap drastically improves performance.
There is also work in progress mainly by Rusty to do copy-less tap
networking.

> I didnt use the option because I think that is default. But it seems
> if you use "-net" (for "model=virtio" in this case), you must specify
> the networking mode.
> 
> Regards,
> Jun
> 
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