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

From: Michael Tokarev
Subject: [Qemu-devel] Re: net packet storms with multiple NICs
Date: Fri, 23 Oct 2009 20:57:00 +0400
User-agent: Mozilla-Thunderbird (X11/20090706)

Andreas Plesner Jacobsen wrote:
On Fri, Oct 23, 2009 at 08:25:39PM +0400, Michael Tokarev wrote:
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

I think the major issue is that the definition of a "pair" is when the
vlan-options match. There's no requirement to define the two after each

I mean something like this (rough approximation:

 int host_vlan_no = 0, guest_vlan_no = 0;

 while(parse_option()) {
    if (option == host-side-net) {
      if (!explicit_vlan) vlan = host_vlan_no;
    if (option == guest-side-net) {
      if (!explicit_vlan) vlan = guest_vlan_no;

this way, consecutive host-side -net will receive
consecutive vlan=NN, and consecutive guest-side -net
also consecutive vlan=NN numbers.

But having in mind Marc's reply I don't think it's
necessary anymore.



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