I am seeing a similar issue but instead of the network breaking I get very variable latency. It's like the VM is pausing.
This only happens with virtio networking. Switching to e1000 fixes the issue. Ubuntu 14.04 3.13.0-30-generic on both the host machines and VM's with bridge networking. 64 bytes from 10.3.0.2: icmp_seq=59 ttl=64 time=0.717 ms 64 bytes from 10.3.0.2: icmp_seq=60 ttl=64 time=0.706 ms 64 bytes from 10.3.0.2: icmp_seq=61 ttl=64 time=0.454 ms 64 bytes from 10.3.0.2: icmp_seq=62 ttl=64 time=0.635 ms 64 bytes from 10.3.0.2: icmp_seq=63 ttl=64 time=0.707 ms 64 bytes from 10.3.0.2: icmp_seq=64 ttl=64 time=2333 ms # Starts here 64 bytes from 10.3.0.2: icmp_seq=65 ttl=64 time=856 ms 64 bytes from 10.3.0.2: icmp_seq=66 ttl=64 time=350 ms 64 bytes from 10.3.0.2: icmp_seq=67 ttl=64 time=80.1 ms 64 bytes from 10.3.0.2: icmp_seq=68 ttl=64 time=12.5 ms 64 bytes from 10.3.0.2: icmp_seq=69 ttl=64 time=2.71 ms 64 bytes from 10.3.0.2: icmp_seq=70 ttl=64 time=1.71 ms 64 bytes from 10.3.0.2: icmp_seq=71 ttl=64 time=0.597 ms 64 bytes from 10.3.0.2: icmp_seq=72 ttl=64 time=0.729 ms 64 bytes from 10.3.0.2: icmp_seq=73 ttl=64 time=0.727 ms 64 bytes from 10.3.0.2: icmp_seq=74 ttl=64 time=0.642 ms 64 bytes from 10.3.0.2: icmp_seq=75 ttl=64 time=0.715 ms 64 bytes from 10.3.0.2: icmp_seq=76 ttl=64 time=0.715 ms 64 bytes from 10.3.0.2: icmp_seq=77 ttl=64 time=0.776 ms 64 bytes from 10.3.0.2: icmp_seq=78 ttl=64 time=0.742 ms 64 bytes from 10.3.0.2: icmp_seq=79 ttl=64 time=0.770 ms -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1325560 Title: kvm virtio netdevs lose network connectivity under "enough" load To manage notifications about this bug go to: https://bugs.launchpad.net/libvirt/+bug/1325560/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
