[Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing packets under high load of traffic

[Vincent JARDIN]

for tracking,
  
http://git.qemu.org/?p=qemu.git;a=patch;h=5669655aafdb88a8797c74a989dd0c0ebb1349fa

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https://bugs.launchpad.net/bugs/1556306

Title:
   vhost-user: qemu stops processing packets under high load of traffic

Status in QEMU:
  New

Bug description:
  Description of problem:
  - qemu socket becomes full, causing qemu to send incomplete
  SET_VRING_CALL messages to vhost-user backend (without proper fd set in
  ancillary data).
  - after some time, some interrupts are lost, causing the VM to stop
  transmitting packets.

  How reproducible:
  Run a stress tests of a vhost-user interface using an UDP
  traffic generator. Traffic generator (IXIA) was connected to 2 physical ports 
that are in turn connected to 2 virtio ports through a linux bridge, VM
  (running linux) doing routing to forward packets between the 2 virtio ports.
  When traffic reaches high pps rates of small packets,

  Actual results:
  - VM stop transmitting packets

  Expected results:
  - VM should never stop transmitting packets

  Additional info:
  We do propose a fix at:
    http://lists.nongnu.org/archive/html/qemu-devel/2015-12/msg00652.html

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