On Thu, Jul 9, 2015 at 5:16 AM, Marc Caubet mcaubet@pic.es 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 _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos