If you are talking about why you are getting ~2 Gbps and not 10 Gbps using GRE tunnel, then I think it is expected. I haven't gotten more than 4 Gbps using GRE tunnel (with a lot of network optimizations like setting affinity etc). If you expect to get 10 Gbps, you should use a tunnel that has some help from the NIC with offloading.
On Fri, Jul 25, 2014 at 4:05 AM, Kristoffer Egefelt <kristof...@itoc.dk> wrote: > I just confirmed that without the GRE tunnel, it works. > So it seems the problem is in the GRE handling in or after openvswitch. > > I’m not sure if this is actually supposed to work with GRE packets - do the > NIC drivers need to support GRE offload for this to work? > Or could it be a kernel issue - as I understand it OVS 2.1 uses the kernels > GRE implementation? > > > > On 25/07/2014, at 11.15.30, Kristoffer Egefelt <kristof...@itoc.dk> wrote: > >> Hi Flavio, >> >>> On Thu, Jul 24, 2014 at 01:47:32PM +0200, Kristoffer Egefelt wrote: >>> [...] >>>> - Packets egressing openvswitch over a gre tunnel is segmented to >>>> 1500 bytes. If I configure mtu 9000 in the VM, the packets are >>>> segmented to 9000 bytes on the gre tunnel - in any case tcpdump in >>>> the sending VM shows packet sizes of 62636 bytes - strange ? >>> >>> Packets can go up to 64k when segmentation offloading is enabled >>> on the interface. >> >> >> Right, so the trigger here could be netback/netfront or the kernel or the >> NIC driver transporting GRE packets? >> I’m not sure what to expect here - if all offloading is enabled in the >> entire path, should GSO/GRO 64K packets be able to traverse: >> >> VM1-> Netfront -> Netback -> OVS bridge -> OVS GRE bridge -> NIC -> switch >> and >> Switch -> NIC -> OVS GRE bridge -> OVS bridge -> Netback -> Netfront -> VM2 >> >> all without being segmented, other than below the NIC driver and in the >> switch ? >> >> Do you know if this is supposed to just work - I might be hitting some weird >> bug here. Using intel IXGBE, kernel 3.13, ovs 2.1. >> >> Offloading in NICs and VIFs and VMs eth0 included below: >> >> — Hypervisor: >> Features for eth0: >> rx-checksumming: on >> tx-checksumming: on >> tx-checksum-ipv4: on >> tx-checksum-ip-generic: off [fixed] >> tx-checksum-ipv6: on >> tx-checksum-fcoe-crc: on [fixed] >> tx-checksum-sctp: on >> 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 [fixed] >> tx-tcp6-segmentation: on >> udp-fragmentation-offload: off [fixed] >> generic-segmentation-offload: on >> generic-receive-offload: on >> large-receive-offload: off >> rx-vlan-offload: on >> tx-vlan-offload: on >> ntuple-filters: off >> receive-hashing: on >> highdma: on [fixed] >> rx-vlan-filter: on [fixed] >> vlan-challenged: off [fixed] >> tx-lockless: off [fixed] >> netns-local: off [fixed] >> tx-gso-robust: off [fixed] >> tx-fcoe-segmentation: on [fixed] >> tx-gre-segmentation: off [fixed] >> tx-udp_tnl-segmentation: off [fixed] >> tx-mpls-segmentation: off [fixed] >> fcoe-mtu: off [fixed] >> tx-nocache-copy: on >> loopback: off [fixed] >> rx-fcs: off [fixed] >> rx-all: off [fixed] >> tx-vlan-stag-hw-insert: off [fixed] >> rx-vlan-stag-hw-parse: off [fixed] >> rx-vlan-stag-filter: off [fixed] >> >> >> — vif >> Features for vif1.0: >> rx-checksumming: off [fixed] >> tx-checksumming: on >> tx-checksum-ipv4: on >> tx-checksum-ip-generic: off [fixed] >> tx-checksum-ipv6: off [fixed] >> 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 [fixed] >> tx-tcp6-segmentation: off [fixed] >> udp-fragmentation-offload: off [fixed] >> generic-segmentation-offload: off >> generic-receive-offload: on >> large-receive-offload: off [fixed] >> rx-vlan-offload: off [fixed] >> tx-vlan-offload: off [fixed] >> ntuple-filters: off [fixed] >> receive-hashing: off [fixed] >> highdma: off [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] >> tx-mpls-segmentation: off [fixed] >> fcoe-mtu: off [fixed] >> tx-nocache-copy: on >> loopback: off [fixed] >> rx-fcs: off [fixed] >> rx-all: off [fixed] >> tx-vlan-stag-hw-insert: off [fixed] >> rx-vlan-stag-hw-parse: off [fixed] >> rx-vlan-stag-filter: off [fixed] >> >> — VM >> Features for eth0: >> rx-checksumming: on [fixed] >> tx-checksumming: on >> tx-checksum-ipv4: on >> tx-checksum-ip-generic: off [fixed] >> tx-checksum-ipv6: off [fixed] >> 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 [fixed] >> tx-tcp6-segmentation: off [fixed] >> udp-fragmentation-offload: off [fixed] >> generic-segmentation-offload: on >> generic-receive-offload: on >> large-receive-offload: off [fixed] >> rx-vlan-offload: off [fixed] >> tx-vlan-offload: off [fixed] >> ntuple-filters: off [fixed] >> receive-hashing: off [fixed] >> highdma: off [fixed] >> rx-vlan-filter: off [fixed] >> vlan-challenged: off [fixed] >> tx-lockless: off [fixed] >> netns-local: off [fixed] >> tx-gso-robust: on [fixed] >> tx-fcoe-segmentation: off [fixed] >> tx-gre-segmentation: off [fixed] >> tx-ipip-segmentation: off [fixed] >> tx-sit-segmentation: off [fixed] >> tx-udp_tnl-segmentation: off [fixed] >> tx-mpls-segmentation: off [fixed] >> fcoe-mtu: off [fixed] >> tx-nocache-copy: on >> loopback: off [fixed] >> rx-fcs: off [fixed] >> rx-all: off [fixed] >> tx-vlan-stag-hw-insert: off [fixed] >> rx-vlan-stag-hw-parse: off [fixed] >> rx-vlan-stag-filter: off [fixed] >> l2-fwd-offload: off [fixed] >> >> Thanks for your help. >> >> Regards >> Kristoffer >> _______________________________________________ >> discuss mailing list >> discuss@openvswitch.org >> http://openvswitch.org/mailman/listinfo/discuss >> > > _______________________________________________ > discuss mailing list > discuss@openvswitch.org > http://openvswitch.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
