yahoo-eng-team team mailing list archive

[mark zhang <2067851@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Hello,

We have two VMs that communicate with each other. Like VM-A and VM-B, on
different hosts, host-A and host-B.

Now, we encountered one problem:
VM-A sends one burst packets like 300K packets(each packet is less than 100 bytes) per seconds to VM-B. But VM-B could only receive about 100K packets. The burst last about 2 seconds.

We did tracing where the packet got dropped. And found on host-B, the virtual port "patch-tun" in br-int could receive all packets.
But the "qvoxxx" interface on br-int couldn't receive all packets.

We tried to dump: ovs-appctl bridge/dump-flows br-int and ovs-ofctl dump-ports br-int.
But no significant drop counter could match such number of the packets drop.

Need your expertise to check where could the packets got lost. Any
configuartion could impact on such situation?

Thanks,
Mark

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ovs

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https://bugs.launchpad.net/bugs/2067851

Title:
  Packets dropped in br-int bridge

Status in neutron:
  New

Bug description:
  Hello,

  We have two VMs that communicate with each other. Like VM-A and VM-B,
  on different hosts, host-A and host-B.

  Now, we encountered one problem:
  VM-A sends one burst packets like 300K packets(each packet is less than 100 bytes) per seconds to VM-B. But VM-B could only receive about 100K packets. The burst last about 2 seconds.

  We did tracing where the packet got dropped. And found on host-B, the virtual port "patch-tun" in br-int could receive all packets.
  But the "qvoxxx" interface on br-int couldn't receive all packets.

  We tried to dump: ovs-appctl bridge/dump-flows br-int and ovs-ofctl dump-ports br-int.
  But no significant drop counter could match such number of the packets drop.

  Need your expertise to check where could the packets got lost. Any
  configuartion could impact on such situation?

  Thanks,
  Mark

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