On Tuesday, June 05, 2012 12:17:17 AM Charles.Tsai-蔡清海-研究發展部 wrote: > We recently ran an Ubuntu 11.10 VM which was installed with VirtIO NIC > driver. The VirtIO net driver came from the Ubuntu's default package. The > VM we installed was configured as a bridge mode. When we ran the Iperf > test against the VM, the network interface of the VM was fairly unstable. > Sometimes, the network interface of the VM could not receive the packets > and we needed to bright the network interface down and up in order to make > it work. After we replaced the VirtIo Net driver with ne2k driver and it > worked quite stably now.
The normal answer is "update to the latest kernel (host and guest) and qemu/kvm. > > > > We know that the performance of virtIO is much better than ne2k in virtual > environment. We would like to use virtio driver instead. If this is the > virtio driver issue, can you tell us where to get the latest virtIO driver > for Ubuntu VM? Otherwise, tell us how to make the virtio net driver work > in Ubuntu VM if you have ever had similar issue before. > > The version of Qemu installed in Ubuntu is 1.0 I have to imagine they are backporting 1.0 branch fixes to that, but even then nothing pops out in my memory about problems like that with 1.0. Older versions are a different story. You might try telling us host kernel version, guest kernel version (we don't all have a matrix for what random distro version has what kernel/qemu/kvm versions). Also, the command line used to run the guest is almost always a requirement for help.
