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List:       openvswitch-discuss
Subject:    [ovs-discuss] [Q]packet loss in ovs and bonding configuration issue
From:       blp () nicira ! com (Ben Pfaff)
Date:       2013-11-22 15:48:10
Message-ID: 20131122154810.GD9401 () nicira ! com
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On Fri, Nov 22, 2013 at 10:34:29AM +0900, Soyoung Jeong wrote:
> I have a bonded port in the  OVS and in that port I found some packets lost
> in the OVS.
> 
> 
> [root at xcnc133 ~]# ovs-dpctl show xapi12
> 
> lookups: frags:0, hit:12808235384, missed:2091274971, lost:15849
> 
> port 0: xapi12 (internal)
> 
> port 1: bond0 (internal)
> 
> port 2: eth6
> 
> port 3: eth4
> 
> port 4: xapi14 (internal)
> 
> port 5: xapi13 (internal)
> 
> port 6: vif6.0
> 
> port 7: vif169.0
> 
> port 8: vif171.0
> 
> port 9: vif12.0
> 
> ...
> 
> 
> There is no traffic congestion and no resource starvation in dom0.
> 
> So I investigated the bonding configuration and I think something's wrong
> about my bonding type.
> 
> 
> [root at xcnc137 log]# ovs-vsctl list port bond0
> 
> _uuid                        : 14ac8377-fd93-48a6-95c6-b5884d6374cd
> 
> bond_downdelay      : 200
> 
> bond_fake_iface       : true
> 
> *bond_mode             : balance-slb*
> 
> bond_updelay          : 31000
> 
> external_ids             : {}
> 
> fake_bridge             : false
> 
> interfaces                : [cbfa82ff-fa2b-46ba-9f6c-1fada08cb3f1,
> de9e7b9e-4fd0-429d-bc14-ba0cbd57ad00]
> 
> lacp                         : off
> 
> mac                         : "a0:36:9f:14:18:a0"
> 
> name                       : "bond0"
> 
> other_config        : {bond-detect-mode=carrier, bond-miimon-interval="100"}
> 
> qos                       : []
> 
> tag                      : []
> 
> trunks                 : []
> 
> 
> I read the OVS manual for bonding type and it says:
> 
>    - balance-slb: Balances flows among slaves based on source MAC address
>    and output VLAN, with periodic rebalancing as traffic patterns change.
>    - active-backup:  Assigns all flows to one slave, failing over to a
>    backup slave when the active slave is disabled. This is the only bonding
>    mode in which interfaces may be plugged into different upstream switches.
> 
> According to the explanation, I think I have a wrong configuration in my
> OVS because I have different upstream switches for bonded port,,
> 
> Do you think it could be the reason of some packet loss in OVS? Are those
> rules still effective in OVS 1.0.99?

I agree that you're using the wrong bonding type.  It is not the source
of the lost packets.  I wouldn't worry about the lost packets, because
they will happen occasionally, especially with such an old version of
OVS, and there is nothing you can do about it.

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