On Thu, Jul 9, 2015 at 5:16 AM, Marc Caubet <mcaubet@xxxxxx> wrote:
> Hi all,
>
> we are testing CentOS 7 in order to migrate from Scientific Linux 6 /
> CentOS 6 and we are facing an issue with the network. Trying to configure
> network with teaming in activebackup mode or also with bonding in mode=1
> (active backup as well) we see many RX dropped packets in the bond0
> interface (around 10% of the total), 100% RX drops in the backup interface
> and 0% in the active interface. Current kernel is
> 3.10.0-229.7.2.el7.x86_64, and I tried with included ixgbe driver (4.0.1)
> and with by compiling the newest version (ixgbe-4.1.1-1.x86_64), results
> are the same. We use tagged VLANs, but switch has configured a correct
> VLAN, a we saw no problems when this machine was running Scientific Linux 6
> (CentOS 6-like system).
I had this issue with an oracle linux and mode 6. They told me that
the new driver version was counting as dropped packets all the packets
that where not intended for a bond member... Quoting:
"This is not a bug. All kernels prior to 2.6.37 do not record packets
that are received on an interface for which there is no handler.
Recording all dropped packets is by design and is intentional from
2.6.37.In the case of active-backup bonds, this includes all packets
sent to passive interface. Other packets that will be dropped include
broadcast packets that are of no interest to the host.
Note that the "dropped" in ifconfig count situations where a packet
was successfully received, but the kernel *chose* to drop the packet
because it had no handler for the data in the packet. So, the drop
counters are entirely normal (if strange-looking); however, they can
point to traffic being on the network that isn't intended to be there
(such as misconfigured/rogue hosts)."
> Any ideas?
>
> [root@dc106 ~]# cat /proc/net/bonding/bond0
> Ethernet Channel Bonding Driver: v3.7.1 (April 27, 2011)
>
> Bonding Mode: fault-tolerance (active-backup)
> Primary Slave: enp6s0 (primary_reselect always)
> Currently Active Slave: enp6s0
> MII Status: up
> MII Polling Interval (ms): 100
> Up Delay (ms): 600000
> Down Delay (ms): 0
>
> Slave Interface: enp6s0
> MII Status: up
> Speed: 10000 Mbps
> Duplex: full
> Link Failure Count: 0
> Permanent HW addr: 00:1b:21:91:aa:c5
> Slave queue ID: 0
>
> Slave Interface: enp7s0f0
> MII Status: up
> Speed: 1000 Mbps
> Duplex: full
> Link Failure Count: 0
> Permanent HW addr: 00:25:90:1a:2d:aa
> Slave queue ID: 0
>
> [root@dc106 ~]# cat /etc/sysconfig/network-scripts/ifcfg-bond0
> DEVICE=bond0
> IPADDR=193.109.172.106
> NETMASK=255.255.255.128
> USERCTL=no
> BOOTPROTO=none
> ONBOOT=yes
> MTU=9000
> IPV6ADDR=2001:67c:1148:200::106
> TYPE=Bond
> BONDING_MASTER=yes
> NM_CONTROLLED=no
> BONDING_OPTS="options bonding mode=1 primary=enp6s0 miimon=100
> updelay=600000"
>
> [root@dc106 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp7s0f0
> # Network slave interface
> DEVICE=enp7s0f0
> USERCTL=no
> ONBOOT=yes
> MASTER=bond0
> SLAVE=yes
> BOOTPROTO=none
> HWADDR=00:25:90:1A:2D:AA
> NM_CONTROLLED=no
>
> [root@dc106 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp6s0
> # Network slave interface
> DEVICE=enp6s0
> USERCTL=no
> ONBOOT=yes
> MASTER=bond0
> SLAVE=yes
> BOOTPROTO=none
> HWADDR=00:1B:21:91:AA:C5
> NM_CONTROLLED=no
>
> [root@dc106 ~]# ifconfig enp6s0
> enp6s0: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST> mtu 9000
> ether 00:1b:21:91:aa:c5 txqueuelen 50000 (Ethernet)
> RX packets 19815269 bytes 1317959345 (1.2 GiB)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 126023402 bytes 1134827686804 (1.0 TiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
>
> [root@dc106 ~]# ifconfig enp7s0f0
> enp7s0f0: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST> mtu 9000
> ether 00:1b:21:91:aa:c5 txqueuelen 50000 (Ethernet)
> RX packets 29436 bytes 1768642 (1.6 MiB)
> RX errors 0 dropped 29436 overruns 0 frame 0
> TX packets 10 bytes 1275 (1.2 KiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
> device memory 0xfafe0000-faffffff
>
> [root@dc106 ~]# ifconfig bond0
> bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST> mtu 9000
> inet 193.109.172.106 netmask 255.255.255.128 broadcast
> 193.109.172.127
> ether 00:1b:21:91:aa:c5 txqueuelen 50000 (Ethernet)
> RX packets 19844789 bytes 1319735635 (1.2 GiB)
> RX errors 0 dropped 1960770 overruns 0 frame 0
> TX packets 126023464 bytes 1134827699315 (1.0 TiB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
>
> Thanks a lot,
> --
> Marc Caubet Serrabou
> PIC (Port d'Informació Científica)
> Campus UAB, Edificio D
> E-08193 Bellaterra, Barcelona
> Tel: +34 93 581 33 22
> Fax: +34 93 581 41 10
> http://www.pic.es
> Avis - Aviso - Legal Notice: http://www.ifae.es/legal.html
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--
Marcelo
"¿No será acaso que esta vida moderna está teniendo más de moderna que de
vida?" (Mafalda)
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