On 12/16/2014 09:38 AM, Adrián Norte Fernández wrote: > Disable offloading on the nodes with: ethtool -K interfaceName gro off > gso off tso off > > And then try it again That should only make things better if there was some sort of actual functional problem no? When diagnosing "network" performance issues I like to get other things out of the way - so get rid of filesystems, encryption, etc. To that end I would suggest running a basic network benchmark. I have a natural bias towards netperf of course :) http://www.netperf.org/ but even iperf would suffice. I've also found (based on some ancient work back in the whatever the "D" release was called time frame that emulated NICs (in my case the realtek) are much slower than the virt_io "NIC." In the case of the realteck emulation at least, my recollection was the maximum I got out of an instance was on the order of about 250ish Mbit/s as it happens... happy benchmarking, rick jones > > El 16/12/2014 18:36, "Georgios Dimitrakakis" <giorgis at acmac.uoc.gr > <mailto: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 > <http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack> > Post to : openstack at lists.openstack.org > <mailto:openstack at lists.openstack.org> > Unsubscribe : > http://lists.openstack.org/__cgi-bin/mailman/listinfo/__openstack > <http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack> > > > > _______________________________________________ > 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 >