Re: [Qemu-devel] [Bug 1180777] Re: RDP traffic freeze on quiet network

[Serge Hallyn <1180777@bugs.launchpad.net>]

Quoting Vasile Dumitrescu (launchpad.vasile@undeva.net):
> I added a rtl8139c netcard to the VM and connected through it by RDP -
> no more freezes.
> 
> It looks like kvm does not play well with virtio network cards and RDP.
> 
> Red Hat virtio net windows driver version: 62.65.104.6500, 6/19/2013

This makes me wonder if the bug may not actually be in the virtio net driver.
The source for that is at
https://github.com/YanVugenfirer/kvm-guest-drivers-windows .
Something like commit 9b1b81a731f722efa8df24429649b527a17bf433 might
be relevant (assuming the git HEAD has this fixed, which I've not
tested).

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https://bugs.launchpad.net/bugs/1180777

Title:
  RDP traffic freeze on quiet network

Status in QEMU:
  New
Status in “qemu-kvm” package in Ubuntu:
  Confirmed
Status in Debian GNU/Linux:
  New

Bug description:
  To summarize what I think has been found so far,

    1. The main symptom is that RDP connections hang after some time
    2. This bug affects qemu 1.0 .. 1.6.5
    3. This bug affects at least windows xp and windows 7 guests
    4. Keeping another network connection open, such as vnc, prevents the RDP connection from hanging.

  ========================================
  Hi,

  I have recently setup a Windows 7 VM on KVM and started using it
  through remote desktop.

  What happens is that, after some hours of usage, the remote desktop
  connection freezes. I thought it was a remmina bug, as the it was
  enough to kill and restart it to successfully connect again to the VM.

  However, today I've switched to a different RDP client (2X Client
  chromium app) and the freeze just happened again!

  Some information:
  - the host and the VM are completely idle when the freeze occurs
  - I've tried sniffing the network packets toward the RDP port during the freeze and found that the client is sending packets but no packet is sent back

  Could this be a KVM issue? How can I further debug this one (I expect
  the freeze to happen again...)?

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: kvm 1:84+dfsg-0ubuntu16+1.0+noroms+0ubuntu14.8
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic 3.2.42
  Uname: Linux 3.2.0-41-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.2
  Architecture: amd64
  Date: Thu May 16 14:12:40 2013
  MachineType: Hewlett-Packard HP ProBook 4520s
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic root=UUID=D2E20BC3E20BAAB5 loop=/hostname/disks/root.disk ro quiet splash vt.handoff=7
  SourcePackage: qemu-kvm
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/26/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68AZZ Ver. F.0A
  dmi.board.name: 1411
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 57.30
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68AZZVer.F.0A:bd08/26/2010:svnHewlett-Packard:pnHPProBook4520s:pvr:rvnHewlett-Packard:rn1411:rvrKBCVersion57.30:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 4520s
  dmi.sys.vendor: Hewlett-Packard

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