Disable offloading on the nodes with: ethtool -K interfaceName gro off gso off tso off And then try it again El 16/12/2014 18:36, "Georgios Dimitrakakis" <giorgis at acmac.uoc.gr> escribió: > > Hi all! > > In my OpenStack installation (Icehouse and use nova legacy networking) the > VMs are talking to each other over a 1Gbps network link. > > My issue is that although file transfers between physical (hypervisor) > nodes can saturate that link transfers between VMs reach very lower speeds > e.g. 30MB/s (approx. 240Mbps). > > My tests are performed by scp'ing a large image file (approx. 4GB) between > the nodes and between the VMs. > > I have updated my images to use e1000 nic driver but the results remain > the same. > > What are any other limiting factors? > > Does it has to do with the disk driver I am using? Does it play > significant role the filesystem of the hypervisor node? > > Any ideas on how to approach the saturation of the 1Gbps link? > > > Best regards, > > > George > > _______________________________________________ > Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/ > openstack > Post to : openstack at lists.openstack.org > Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/ > openstack > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack/attachments/20141216/44f96919/attachment.html>