[ovs-discuss] [ovs-dpdk] bandwidth issue of vhostuserclient virtio ovs-dpdk
Lam, Tiago
tiago.lam at intel.com
Thu Nov 29 10:00:49 UTC 2018
On 29/11/2018 08:24, LIU Yulong wrote:
> Hi,
>
> We recently tested ovs-dpdk, but we met some bandwidth issue. The bandwidth
> from VM to VM was not close to the physical NIC, it's about 4.3Gbps on a
> 10Gbps NIC. For no dpdk (virtio-net) VMs, the iperf3 test can easily
> reach 9.3Gbps. We enabled the virtio multiqueue for all guest VMs. In the
> dpdk vhostuser guest, we noticed that the interrupts are centralized to
> only one queue. But for no dpdk VM, interrupts can hash to all queues.
> For those dpdk vhostuser VMs, we also noticed that the PMD usages were
> also centralized to one no matter server(tx) or client(rx). And no matter
> one PMD or multiple PMDs, this behavior always exists.
>
> Furthuremore, my colleague add some systemtap hook on the openvswitch
> function, he found something interesting. The function
> __netdev_dpdk_vhost_send will send all the packets to one virtionet-queue.
> Seems that there are some algorithm/hash table/logic does not do the hash
> very well.
>
Hi,
When you say "no dpdk VMs", you mean that within your VM you're relying
on the Kernel to get the packets, using virtio-net. And when you say
"dpdk vhostuser guest", you mean you're using DPDK inside the VM to get
the packets. Is this correct?
If so, could you also tell us which DPDK app you're using inside of
those VMs? Is it testpmd? If so, how are you setting the `--rxq` and
`--txq` args? Otherwise, how are you setting those in your app when
initializing DPDK?
The information below is useful in telling us how you're setting your
configurations in OvS, but we are still missing the configurations
inside the VM.
This should help us in getting more information,
Tiago.
> So I'd like to find some help from the community. Maybe I'm missing some
> configrations.
>
> Thanks.
>
>
> Here is the list of the environment and some configrations:
> # uname -r
> 3.10.0-862.11.6.el7.x86_64
> # rpm -qa|grep dpdk
> dpdk-17.11-11.el7.x86_64
> # rpm -qa|grep openvswitch
> openvswitch-2.9.0-3.el7.x86_64
> # ovs-vsctl list open_vswitch
> _uuid : a6a3d9eb-28a8-4bf0-a8b4-94577b5ffe5e
> bridges : [531e4bea-ce12-402a-8a07-7074c31b978e,
> 5c1675e2-5408-4c1f-88bc-6d9c9b932d47]
> cur_cfg : 1305
> datapath_types : [netdev, system]
> db_version : "7.15.1"
> external_ids : {hostname="cq01-compute-10e112e5e140",
> rundir="/var/run/openvswitch",
> system-id="e2cc84fe-a3c8-455f-8c64-260741c141ee"}
> iface_types : [dpdk, dpdkr, dpdkvhostuser, dpdkvhostuserclient,
> geneve, gre, internal, lisp, patch, stt, system, tap, vxlan]
> manager_options : [43803994-272b-49cb-accc-ab672d1eefc8]
> next_cfg : 1305
> other_config : {dpdk-init="true", dpdk-lcore-mask="0x1",
> dpdk-socket-mem="1024,1024", pmd-cpu-mask="0x100000",
> vhost-iommu-support="true"}
> ovs_version : "2.9.0"
> ssl : []
> statistics : {}
> system_type : centos
> system_version : "7"
> # lsmod |grep vfio
> vfio_pci 41312 2
> vfio_iommu_type1 22300 1
> vfio 32695 7 vfio_iommu_type1,vfio_pci
> irqbypass 13503 23 kvm,vfio_pci
>
> # ovs-appctl dpif/show
> netdev at ovs-netdev: hit:759366335 missed:754283
> br-ex:
> bond1108 4/6: (tap)
> br-ex 65534/3: (tap)
> nic-10G-1 5/4: (dpdk: configured_rx_queues=8,
> configured_rxq_descriptors=2048, configured_tx_queues=2,
> configured_txq_descriptors=2048, mtu=1500, requested_rx_queues=8,
> requested_rxq_descriptors=2048, requested_tx_queues=2,
> requested_txq_descriptors=2048, rx_csum_offload=true)
> nic-10G-2 6/5: (dpdk: configured_rx_queues=8,
> configured_rxq_descriptors=2048, configured_tx_queues=2,
> configured_txq_descriptors=2048, mtu=1500, requested_rx_queues=8,
> requested_rxq_descriptors=2048, requested_tx_queues=2,
> requested_txq_descriptors=2048, rx_csum_offload=true)
> phy-br-ex 3/none: (patch: peer=int-br-ex)
> br-int:
> br-int 65534/2: (tap)
> int-br-ex 1/none: (patch: peer=phy-br-ex)
> vhu76f9a623-9f 2/1: (dpdkvhostuserclient: configured_rx_queues=8,
> configured_tx_queues=8, mtu=1500, requested_rx_queues=8,
> requested_tx_queues=8)
>
> # ovs-appctl dpctl/show -s
> netdev at ovs-netdev:
> lookups: hit:759366335 missed:754283 lost:72
> flows: 186
> port 0: ovs-netdev (tap)
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:0 errors:0 dropped:0 aborted:0 carrier:0
> collisions:0
> RX bytes:0 TX bytes:0
> port 1: vhu76f9a623-9f (dpdkvhostuserclient: configured_rx_queues=8,
> configured_tx_queues=8, mtu=1500, requested_rx_queues=8,
> requested_tx_queues=8)
> RX packets:718391758 errors:0 dropped:0 overruns:? frame:?
> TX packets:30372410 errors:? dropped:719200 aborted:? carrier:?
> collisions:?
> RX bytes:1086995317051 (1012.3 GiB) TX bytes:2024893540 (1.9 GiB)
> port 2: br-int (tap)
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:1393992 errors:0 dropped:4 aborted:0 carrier:0
> collisions:0
> RX bytes:0 TX bytes:2113616736 (2.0 GiB)
> port 3: br-ex (tap)
> RX packets:0 errors:0 dropped:0 overruns:0 frame:0
> TX packets:6660091 errors:0 dropped:967 aborted:0 carrier:0
> collisions:0
> RX bytes:0 TX bytes:2451440870 (2.3 GiB)
> port 4: nic-10G-1 (dpdk: configured_rx_queues=8,
> configured_rxq_descriptors=2048, configured_tx_queues=2,
> configured_txq_descriptors=2048, mtu=1500, requested_rx_queues=8,
> requested_rxq_descriptors=2048, requested_tx_queues=2,
> requested_txq_descriptors=2048, rx_csum_offload=true)
> RX packets:36409466 errors:0 dropped:0 overruns:? frame:?
> TX packets:718371472 errors:0 dropped:20276 aborted:? carrier:?
> collisions:?
> RX bytes:2541593983 (2.4 GiB) TX bytes:1089838136919 (1015.0 GiB)
> port 5: nic-10G-2 (dpdk: configured_rx_queues=8,
> configured_rxq_descriptors=2048, configured_tx_queues=2,
> configured_txq_descriptors=2048, mtu=1500, requested_rx_queues=8,
> requested_rxq_descriptors=2048, requested_tx_queues=2,
> requested_txq_descriptors=2048, rx_csum_offload=true)
> RX packets:5319466 errors:0 dropped:0 overruns:? frame:?
> TX packets:0 errors:0 dropped:0 aborted:? carrier:?
> collisions:?
> RX bytes:344903551 (328.9 MiB) TX bytes:0
> port 6: bond1108 (tap)
> RX packets:228 errors:0 dropped:0 overruns:0 frame:0
> TX packets:5460 errors:0 dropped:18 aborted:0 carrier:0
> collisions:0
> RX bytes:21459 (21.0 KiB) TX bytes:341087 (333.1 KiB)
>
> # ovs-appctl dpif-netdev/pmd-stats-show
> pmd thread numa_id 0 core_id 20:
> packets received: 760120690
> packet recirculations: 0
> avg. datapath passes per packet: 1.00
> emc hits: 750787577
> megaflow hits: 8578758
> avg. subtable lookups per megaflow hit: 1.05
> miss with success upcall: 754283
> miss with failed upcall: 72
> avg. packets per output batch: 2.21
> idle cycles: 210648140144730 (99.13%)
> processing cycles: 1846745927216 (0.87%)
> avg cycles per packet: 279554.14 (212494886071946/760120690)
> avg processing cycles per packet: 2429.54 (1846745927216/760120690)
> main thread:
> packets received: 0
> packet recirculations: 0
> avg. datapath passes per packet: 0.00
> emc hits: 0
> megaflow hits: 0
> avg. subtable lookups per megaflow hit: 0.00
> miss with success upcall: 0
> miss with failed upcall: 0
> avg. packets per output batch: 0.00
>
> # ovs-appctl dpif-netdev/pmd-rxq-show
> pmd thread numa_id 0 core_id 20:
> isolated : false
> port: nic-10G-1 queue-id: 0pmd usage: 0 %
> port: nic-10G-1 queue-id: 1pmd usage: 0 %
> port: nic-10G-1 queue-id: 2pmd usage: 0 %
> port: nic-10G-1 queue-id: 3pmd usage: 0 %
> port: nic-10G-1 queue-id: 4pmd usage: 0 %
> port: nic-10G-1 queue-id: 5pmd usage: 0 %
> port: nic-10G-1 queue-id: 6pmd usage: 0 %
> port: nic-10G-1 queue-id: 7pmd usage: 0 %
> port: nic-10G-2 queue-id: 0pmd usage: 0 %
> port: nic-10G-2 queue-id: 1pmd usage: 0 %
> port: nic-10G-2 queue-id: 2pmd usage: 0 %
> port: nic-10G-2 queue-id: 3pmd usage: 0 %
> port: nic-10G-2 queue-id: 4pmd usage: 0 %
> port: nic-10G-2 queue-id: 5pmd usage: 0 %
> port: nic-10G-2 queue-id: 6pmd usage: 0 %
> port: nic-10G-2 queue-id: 7pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 0pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 1pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 2pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 3pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 4pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 5pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 6pmd usage: 0 %
> port: vhu76f9a623-9f queue-id: 7pmd usage: 0 %
>
>
> # virsh dumpxml instance-5c5191ff-c1a2-4429-9a8b-93ddd939583d
> ...
> <interface type='vhostuser'>
> <mac address='fa:16:3e:77:ab:fb'/>
> <source type='unix' path='/var/lib/vhost_sockets/vhu76f9a623-9f'
> mode='server'/>
> <target dev='vhu76f9a623-9f'/>
> <model type='virtio'/>
> <driver name='vhost' queues='8'/>
> <alias name='net0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
> function='0x0'/>
> </interface>
> ...
>
> # ovs-vsctl show
> a6a3d9eb-28a8-4bf0-a8b4-94577b5ffe5e
> Manager "ptcp:6640:127.0.0.1"
> is_connected: true
> Bridge br-int
> Controller "tcp:127.0.0.1:6633 <http://127.0.0.1:6633>"
> is_connected: true
> fail_mode: secure
> Port int-br-ex
> Interface int-br-ex
> type: patch
> options: {peer=phy-br-ex}
> Port br-int
> Interface br-int
> type: internal
> Port "vhu76f9a623-9f"
> tag: 1
> Interface "vhu76f9a623-9f"
> type: dpdkvhostuserclient
> options: {n_rxq="8",
> vhost-server-path="/var/lib/vhost_sockets/vhu76f9a623-9f"}
> Bridge br-ex
> Controller "tcp:127.0.0.1:6633 <http://127.0.0.1:6633>"
> is_connected: true
> fail_mode: secure
> Port dpdkbond
> Interface "nic-10G-1"
> type: dpdk
> options: {dpdk-devargs="0000:01:00.0", n_rxq="8", n_txq="8"}
> Interface "nic-10G-2"
> type: dpdk
> options: {dpdk-devargs="0000:05:00.1", n_rxq="8", n_txq="8"}
> Port phy-br-ex
> Interface phy-br-ex
> type: patch
> options: {peer=int-br-ex}
> Port br-ex
> Interface br-ex
> type: internal
>
> # numactl --hardware
> available: 2 nodes (0-1)
> node 0 cpus: 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38
> node 0 size: 130978 MB
> node 0 free: 7539 MB
> node 1 cpus: 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
> node 1 size: 131072 MB
> node 1 free: 6886 MB
> node distances:
> node 0 1
> 0: 10 21
> 1: 21 10
>
> # grep HugePages_ /proc/meminfo
> HugePages_Total: 232
> HugePages_Free: 10
> HugePages_Rsvd: 0
> HugePages_Surp: 0
>
>
> # cat /proc/cmdline
> BOOT_IMAGE=/boot/vmlinuz-3.10.0-862.11.6.el7.x86_64
> root=UUID=220ee106-5e00-4809-91a0-641e045a4c21 ro
> intel_idle.max_cstate=0 crashkernel=auto rhgb quiet
> default_hugepagesz=1G hugepagesz=1G hugepages=232 iommu=pt intel_iommu=on
>
>
> Best regards,
> LIU Yulong
>
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