Thanks for the reply Philip,
You are right i have TSO
(tcp-segmentation-offload: on) enabled on eth0 and eth1,but no other
servers are
showing this in dmesg.
Also With TSO on,why ovs is dropping frames rather than fragmenting it.
Regards,
Kevin
Hi,
>
> seems that you have TSO enabled?
> you can check the offloading features of your NIC with ethtool.
>
> Best,
>
> Philip
>
> Am 02.12.13 15:09, schrieb kevin parker:
>
> Hi,
> I am confused with this in dmesg
> *dmesg |grep "mtu"*
> [10674662.495400] openvswitch: xapi3: dropped over-mtu packet: 2853 > 1500
> [10674662.495406] openvswitch: xapi3: dropped over-mtu packet: 2853 > 1500
> [10674662.495411] openvswitch: xapi3: dropped over-mtu packet: 2853 > 1500
> [10674662.495432] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [10674662.495435] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [10674662.495441] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [13413434.378976] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [13413434.378982] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [13413434.378989] openvswitch: xapi3: dropped over-mtu packet: 4082 > 1500
> [13413434.379050] openvswitch: xapi3: dropped over-mtu packet: 2556 > 1500
> [13413434.379054] openvswitch: xapi3: dropped over-mtu packet: 2556 > 1500
> [13413434.379058] openvswitch: xapi3: dropped over-mtu packet: 2556 > 1500
>
> All interfaces are configured with MTU of 1500 (netstat -i )and on
> physical switch also it is 1500.
>
> I dont understand why it is showing above in dmesg,can some one explain
> me why something is trying to send Frames above 1500 and getting blocked by
> ovs,even if no interface has an MTU of 1500 < .Is there any way to find out
> what is trying to send frames larger than 1500.
>
> ovs-vsctl -V
> ovs-vsctl (Open vSwitch) 1.4.2
> Compiled Nov 23 2012 12:41:37
>
> *ovs-dpctl show *
> system@xapi3:
> lookups: hit:47665012972 missed:27317456871 lost:156544274
> flows: 829
> port 0: xapi3 (internal)
> port 1: eth1
> port 2: eth0
> port 4: xapi4 (internal)
> port 31: vif28.0
> port 32: vif29.0
> port 33: vif30.0
>
> *ovs-vsctl list-ports xapi3*
> bond1
>
> *ovs-appctl bond/show bond1*
> bond_mode: active-backup
> bond-hash-basis: 0
> updelay: 31000 ms
> downdelay: 200 ms
> lacp_negotiated: false
>
> slave eth1: enabled
> active slave
> may_enable: true
>
> slave eth0: enabled
> may_enable: true
>
> Regards,
> Kevin
>
>
>
> _______________________________________________
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>
>
>
> --
> Philip Wette, M.Sc. E-Mail: we...@mail.upb.de
> University of Paderborn Tel.: 05251 / 60-1716
> Department of Computer Science
> Computer Networks Group http://wwwcs.upb.de/cs/ag-karl
> Warburger Straße 100 Room: O3.152
> 33098 Paderborn
>
>
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