Re: How can a bridge be optimized?
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On Tue, Jun 12, 2012 at 06:14:00PM +0300, Henrik Ahlgren wrote: > The relationship between KVM and QEMU is all too confusing, but > nowadays you should only need to care about the qemu-kvm version (?). 0.12 > is quite old and Ubuntu 10.10/maverick no longer receives (security) > updates, so you should consider upgrading if posssible. If upgrading > the whole distro is infeasible, you might be able to install qemu-kvm > and libvirt from a newer Ubuntu release without bringing in too much > dependencies. Anyone know if I can expect qemu-kvm-1.0.1 to compile and install cleanly from source? It would be awkward to have to take the system down for a thorough upgrade, and it's not in a position where security updates are crucial. > > <interface type='bridge'> > > <mac address='00:16:36:89:65:2e'/> > > <source bridge='br0'/> > > <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> > > <model type='virtio'/> > > </interface> > > I like to use network type interfaces and "logical" network names, but > this should work fine. > > You might want to experiment with different offload settings (ethtool > -k) to see if they make any difference with the igb card. Also, have > you tried measuring the performance between the host and a guest? >From host to guest, a bit above 260 Mb/s. From guest to host, a bit below 80 Mb. From guest across LAN to another system, 150 Mb +- 10. From across LAN to guest, 140-180 Mb. From across LAN to host, a consistent 947 Mb. That's with initial offload settings of: Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: off ntuple-filters: off receive-hashing: off With everything switched off, no change in VM I/O from any perspective. Whit _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
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