guest often looses connectivity I have to ping gateway
Hello, I'm on 4.0.6 with CentOS 7.3. The hypervisor is an old blade BL685c G1 and the network adapters used to provide network to vm are 07:04.0 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (rev a3) 07:04.1 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (re managed by tg3 kernel module, as I see in messages: Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:73 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: dma_rwctrl[76148000] dma_mask[40-bit] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:74 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: dma_rwctrl[76148000] dma_mask[40-bit] The 2 adapters are in bonding active-backup mode. They are on vlan, so on hypervisor I have bond1.65 device and in vm the virtual interface is untagged [root@ovmsrv05 ~]# ifconfig bond1.65 bond1.65: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 00:1c:c4:46:ef:73 txqueuelen 1000 (Ethernet) RX packets 4368 bytes 257675 (251.6 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 238 bytes 28146 (27.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@ovmsrv05 ~]# Currently Active Slave: enp7s4f0 After a few minutes I loose connectivity with the guest. In this case if I go in guest console and ping the gateway, the connection is resumed. And I can maintain it if I leave the ping running, otherwise after a little I again loose connectivity. I suspect it is not important but the guest is Oracle Linux 6.5 with 3.8.13-16.2.1.el6uek.x86_64 kernel. The adapter for the vnic is the default; the qemu-kvm command line generated contains this: -netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=30 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:01:51,bus=pci.0,addr=0x3 I seem to remember some years ago when I used the same blades with plain qemu-kvm/libvirt I had to make up an ethtool setting for similar problems, but I don't remember what it was... and possibly I used bnx2 kernel module with the other embedded network interfaces, I'm not sure... Currently, the configuration for adapter on the blade is [root@ovmsrv05 ~]# ethtool -k enp7s4f0 Features for enp7s4f0: rx-checksumming: on 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: off tx-tcp-segmentation: off [requested 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: on [fixed] tx-vlan-offload: on [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: on 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-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: off loopback: off 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] busy-poll: off [fixed] tx-sctp-segmentation: off [fixed] l2-fwd-offload: off [fixed] hw-tc-offload: off [fixed] [root@ovmsrv05 ~]# systool shows no particular parameters for tg3 kernel module available [root@ovmsrv05 ~]# systool -v -m tg3 Module = "tg3" Attributes: coresize = "170653" initsize = "0" initstate = "live" refcnt = "0" rhelversion = "7.3" srcversion = "D276F97F491ADECC61C8284" taint = "" uevent = <store method only> version = "3.137" Sections: ... Thanks, Gianluca
Hi Gianluca, On 01/25/2017 06:28 PM, Gianluca Cecchi wrote:
Hello, I'm on 4.0.6 with CentOS 7.3. The hypervisor is an old blade BL685c G1 and the network adapters used to provide network to vm are 07:04.0 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (rev a3) 07:04.1 Ethernet controller: Broadcom Limited NetXtreme BCM5715S Gigabit Ethernet (re managed by tg3 kernel module, as I see in messages:
Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:73 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.0 eth0: dma_rwctrl[76148000] dma_mask[40-bit] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: Tigon3 [partno(011276-001) rev 9003] (PCIX:133MHz:64-bit) MAC address 00:1c:c4:46:ef:74 Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: attached PHY is 5714 (1000Base-SX Ethernet) (WireSpeed[0], EEE[0]) Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1] Jan 21 18:53:33 ovmsrv05 kernel: tg3 0000:07:04.1 eth1: dma_rwctrl[76148000] dma_mask[40-bit]
I am looking to see if I find something but meanwhile: Which kernel version is running in the system? Have you tried any other kernel version?
The 2 adapters are in bonding active-backup mode. They are on vlan, so on hypervisor I have bond1.65 device and in vm the virtual interface is untagged
[root@ovmsrv05 ~]# ifconfig bond1.65 bond1.65: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 00:1c:c4:46:ef:73 txqueuelen 1000 (Ethernet) RX packets 4368 bytes 257675 (251.6 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 238 bytes 28146 (27.4 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@ovmsrv05 ~]#
Currently Active Slave: enp7s4f0
After a few minutes I loose connectivity with the guest. In this case if I go in guest console and ping the gateway, the connection is resumed. And I can maintain it if I leave the ping running, otherwise after a little I again loose connectivity. I suspect it is not important but the guest is Oracle Linux 6.5 with 3.8.13-16.2.1.el6uek.x86_64 kernel. The adapter for the vnic is the default; the qemu-kvm command line generated contains this: -netdev tap,fd=29,id=hostnet0,vhost=on,vhostfd=30 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:1a:4a:16:01:51,bus=pci.0,addr=0x3
Any error in the guest side like timeouts in messages/journald? Have you tried different guest OS for a test only? Adding Dan, he might have others ideas.
I seem to remember some years ago when I used the same blades with plain qemu-kvm/libvirt I had to make up an ethtool setting for similar problems, but I don't remember what it was... and possibly I used bnx2 kernel module with the other embedded network interfaces, I'm not sure... Currently, the configuration for adapter on the blade is
[root@ovmsrv05 ~]# ethtool -k enp7s4f0 Features for enp7s4f0: rx-checksumming: on 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: off tx-tcp-segmentation: off [requested 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: on [fixed] tx-vlan-offload: on [fixed] ntuple-filters: off [fixed] receive-hashing: off [fixed] highdma: on 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-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: off loopback: off 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] busy-poll: off [fixed] tx-sctp-segmentation: off [fixed] l2-fwd-offload: off [fixed] hw-tc-offload: off [fixed] [root@ovmsrv05 ~]#
systool shows no particular parameters for tg3 kernel module available [root@ovmsrv05 ~]# systool -v -m tg3 Module = "tg3"
Attributes: coresize = "170653" initsize = "0" initstate = "live" refcnt = "0" rhelversion = "7.3" srcversion = "D276F97F491ADECC61C8284" taint = "" uevent = <store method only> version = "3.137"
Sections: ...
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On Thu, Jan 26, 2017 at 8:45 AM, Pavel Gashev <Pax@acronis.com> wrote:
Gianluca,
It looks like VM doesn't receive broadcasts. It can be a network topology issue. Could you double check /sys/class/net/bond1/bonding/mode and /sys/class/net/bond1/bonding/slaves ?
Is it possible you have another VM with the same MAC address in the same network segment?
Pavel, I think you are right! Thanks! I didn't take into consideration that there is another oVirt environment that has some VMs on this vlan.. And I found a VM with the same mac 00:1a:4a:16:01:51 (and a different ip) Now I powered off that other VM, restarted my one and things seem ok. What is the best way to manage when more oVirt environments has VMs on the same vlans? BTW: before finding the problem related to the mac I found my documents when I used qemu-kvm on CentOS 6.3 on the same hardware pieces and I had similar problems (it was mid 2012) and in that case I had to set tx-checksumming off for the interfaces where I had the bridges (managed by libvirt). I created an init script that did the setting at boot. I have verified that by default my network interfaces in CentOS 7.3 start with the parameter set to on. Of course changing the setting didn't solve my problem because was mac related... But Is there any reference about it and what would be the best setting and why? Thanks again in the mean time ;-)
Le 26/01/2017 à 09:03, Gianluca Cecchi a écrit :
On Thu, Jan 26, 2017 at 8:45 AM, Pavel Gashev <Pax@acronis.com <mailto:Pax@acronis.com>> wrote:
Gianluca,
It looks like VM doesn't receive broadcasts. It can be a network topology issue. Could you double check /sys/class/net/bond1/bonding/mode and /sys/class/net/bond1/bonding/slaves ?
Is it possible you have another VM with the same MAC address in the same network segment?
Pavel, I think you are right! Thanks! I didn't take into consideration that there is another oVirt environment that has some VMs on this vlan.. And I found a VM with the same mac 00:1a:4a:16:01:51 (and a different ip) Now I powered off that other VM, restarted my one and things seem ok.
What is the best way to manage when more oVirt environments has VMs on the same vlans?
I encountered the same problem some years ago, as we have multiple oVirt environnements. We decided to assign specific MAC pools for each env to avoid overlapping. -- Nicolas ECARNOT
participants (4)
-
Douglas Schilling Landgraf -
Gianluca Cecchi -
Nicolas Ecarnot -
Pavel Gashev