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Re: [Qemu-devel] net packet storms with multiple NICs

From: Anthony Liguori
Subject: Re: [Qemu-devel] net packet storms with multiple NICs
Date: Tue, 10 Nov 2009 19:38:48 -0600
User-agent: Thunderbird (X11/20090825)

Mark McLoughlin wrote:
On Fri, 2009-10-23 at 20:25 +0400, Michael Tokarev wrote:
I've two questions:

o what's the intended usage of all-vlan-equal case, when kvm (or qemu)
   reflects packets from one interface to another?  It's what bridge
   in linux is for, I think.

I don't think it's necessarily an intended use-case for the vlan feature

o why different -net guest -net host pairs are not getting different
   vlan= indexes by default, to stop the above-mentioned packet
   storms right away?  I think it's a wise default to assign different
   pairs to different vlans, by counting -net host and -net guest

With 0.12, we're going to be de-emphasising the vlan feature and instead
have NICs directly connected to host backends. The vlan feature will be
just another host backend, but optional

You'll start guests with e.g.:

  -netdev tap,id=tap.0 -device virtio-net-pci,netdev=tap.0

Which is not necessarily more friendly to a user, but it lays the foundation to be able to do a config file which in turns could be easily generated from a nic GUI/command line tool.


Anthony Liguori

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