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