[Openstack] Network speed issue

Georgios Dimitrakakis giorgis at acmac.uoc.gr
Tue Dec 16 18:00:45 UTC 2014

 I believe that they are already disabled.

 Here is the ethtool output:

 # ethtool --show-offload eth1
 Features for eth1:
 rx-checksumming: on
 tx-checksumming: on
 	tx-checksum-ipv4: off
 	tx-checksum-unneeded: off
 	tx-checksum-ip-generic: on
 	tx-checksum-ipv6: off
 	tx-checksum-fcoe-crc: off [fixed]
 	tx-checksum-sctp: off [fixed]
 scatter-gather: on
 	tx-scatter-gather: on
 	tx-scatter-gather-fraglist: off [fixed]
 tcp-segmentation-offload: on
 	tx-tcp-segmentation: on
 	tx-tcp-ecn-segmentation: off
 	tx-tcp6-segmentation: on
 udp-fragmentation-offload: off [fixed]
 generic-segmentation-offload: on
 generic-receive-offload: on
 large-receive-offload: off [fixed]
 rx-vlan-offload: on [fixed]
 tx-vlan-offload: on [fixed]
 ntuple-filters: off [fixed]
 receive-hashing: off [fixed]
 highdma: on [fixed]
 rx-vlan-filter: off [fixed]
 vlan-challenged: off [fixed]
 tx-lockless: off [fixed]
 netns-local: off [fixed]
 tx-gso-robust: off [fixed]
 tx-fcoe-segmentation: off [fixed]
 tx-gre-segmentation: off [fixed]
 tx-udp_tnl-segmentation: off [fixed]
 fcoe-mtu: off [fixed]
 loopback: off [fixed]



> 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"  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 scping 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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