I ran into this bug quite a few months ago, too, but worked around it by loading vhost_net kernel driver.<div><br></div><div>Currently I get network outages for just a few seconds, like freezes for ~ 10-15 seconds, and then everything </div>
<div>works like nothing have ever happened.</div><div>I unfortunately can't find anything in the logs inside VM, hypervisor nor nova-network node.</div><div><br></div><div>Regards,</div><div>Christian.<br><br><div class="gmail_quote">
On Fri, Oct 5, 2012 at 4:30 PM, Alejandro Comisario <span dir="ltr"><<a href="mailto:alejandro.comisario@mercadolibre.com" target="_blank">alejandro.comisario@mercadolibre.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<font face="courier new, monospace">Hi Cris, maybe your problem is related to this bug ? </font><div><font face="courier new, monospace"><br></font></div><div><a href="https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/997978" target="_blank">https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/997978</a></div>
<div><br></div><div>Regards.</div><div>Ale<br>
<br><br><div class="gmail_quote"><div><div class="h5">On Fri, Oct 5, 2012 at 8:44 AM, Christian Parpart <span dir="ltr"><<a href="mailto:trapni@gmail.com" target="_blank">trapni@gmail.com</a>></span> wrote:<br></div>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
Hey all,<div><br></div><div>we're pretty happy about our new OpenStack Essex installation atop of Ubuntu 12.04 (hypervisor and guests).</div><div>We use KVM (tenant is in a VLAN) as virtualization technology, having about 15 compute nodes, and a</div>
<div>central nova-network node to act as the gateway (yet to be fully HA'd, however). On that gateway we're having</div><div>a PPTP VPN so we can log in on any host or guest though this VPN.</div><div><br></div><div>
Our problem however is, that from time to time (I think it's daily and even multiple times per day)</div><div>we're encountering kind of networking freezes.</div><div><br></div><div>I first noticed it as my SSH session froze for a few seconds from my desktop -> VPN (nova-network node) -> KVM guest.</div>
<div>I quickly checked others, and they hang, too.</div><div>I checked a hypervisor, which didn't hang, so it is not a general networking issue (like PPTP or SSH or alike).</div><div><br></div><div>Now, it feels like there is some problem with networking from and/or to KVM guests and I absolutely have no clue</div>
<div>on how to trace this down. It really feels like a bug, but that's really out of my scope, and that's why I'm seeking for advice here,</div><div>since we just can't stay in this situation :-)</div><div>
<br></div><div>It is confirmed that we're having this from desktop -> VPN -> KVM and from physical node (in data center) to KVM.</div><div>However, I do not yet know whether all KVMs are affected at once (which would indicate that the issue MAY be caused</div>
<div>by the central nova-network node) or whether it is just hypervisor based (so it may be due to some hypervisor's state)</div><div>or just plain random across all 15 compute nodes we have.</div><div><br></div><div>
I now think that this issue may indeed be KVM networking related</div><div><br></div><div>I'll be happy about any hints and proposals you can provide me in order to track this</div><div>issue down.</div><div><br></div>
<div>Please tell me about any further information you need.</div><div><br></div><div>Many thanks in advance,</div><div>Christian Parpart.</div>
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