[Openstack] Network speed issue

Adrián Norte Fernández adrian at bashlines.com
Tue Dec 16 17:38:02 UTC 2014


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
>
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