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[Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing packets

From: Vincent JARDIN
Subject: [Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing packets under high load of traffic
Date: Mon, 14 Mar 2016 14:30:08 -0000

Let's close it. Sorry, it should  be opened into:

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

Status in QEMU:

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:

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