[Openstack] 99.5% of packets are disappearing somewhere between the Linux Bridge (brqxxxxzzzz-yy) and the tap (tapxxxxzzzz-yy).

Narayanan, Krishnaprasad narayana at uni-mainz.de
Fri Jul 10 18:44:09 UTC 2015


Hi Thiago,

If possible, can you setup a monitoring tool on the host and check the network packets on the host and the VMs for the respective interface? This will confirm whether the packets are dropped or contain errors or successful.

Regards,
Krishnaprasad

From: Martinx - ジェームズ [mailto:thiagocmartinsc at gmail.com]
Sent: Freitag, 10. Juli 2015 20:17
To: openstack at lists.openstack.org
Subject: Re: [Openstack] 99.5% of packets are disappearing somewhere between the Linux Bridge (brqxxxxzzzz-yy) and the tap (tapxxxxzzzz-yy).

Guys,

This problem that I'm facing, seems to be unrelated to OpenStack Neutron.

What I did?

Reconfigured my /etc/network/interfaces file with:

---
auto vlanXXXX
iface vlanXXXX inet manual
        vlan_raw_device eth3

auto brqvlanXXXX-aa
iface brqvlanXXXX-aa inet manual
        bridge_ports vlanXXXX
        bridge_maxwait 5
        bridge_fd 1
        bridge_stp off
---

Started a KVM VM using:

---
    <interface type='bridge'>
      <mac address='52:54:00:ba:46:c5'/>
      <source bridge='brqvlanXXXX-aa'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
---

Same problem! So, OpenStack seems to have nothing to do with this problem that I'm facing...

I'll keep investigating it...

Cheers!
Thiago

On 10 July 2015 at 14:14, Martinx - ジェームズ <thiagocmartinsc at gmail.com<mailto:thiagocmartinsc at gmail.com>> wrote:
Cynthia,

 Attaching a "regular KVM Virtual Machine" directly to the bridge, also did not worked.

 I'll try to create this eth3.XXXX, a LinuxBridge "brqxxxxzzzz-yy" on top of it and a new KVM VM, completely outside of OpenStack but, on top of this very same server.

 Thanks again for the tip!

Thiago

On 9 July 2015 at 22:58, Martinx - ジェームズ <thiagocmartinsc at gmail.com<mailto:thiagocmartinsc at gmail.com>> wrote:
Hi Cynthia,

That's actually a very good idea! I was thinking about this as well... But still did not tried it.

Basically I need to stop "nova-compute" and edit Instance configuration with "virsh edit instance-id"... Sound very easy to try...

Attaching an "alien" instance directly to the "brq50b13311-fa" sounds even easier.

I'll definitively give it a try!

Thanks!

On 9 July 2015 at 05:20, Cynthia Lopes <clsacramento at gmail.com<mailto:clsacramento at gmail.com>> wrote:
Hi,

We had something similar once but the cause was a miss config in our LACP bonding... By your config you don't seem to be using bonding but maybe something external to neutron is causing you the problem.

If you manually launch a VM connected to the bridge brq50b13311-fa, can you see the packets ?



2015-07-09 5:43 GMT+02:00 Kevin Benton <blak111 at gmail.com<mailto:blak111 at gmail.com>>:

I wonder if l2 population is interferring. Can you try disabling l2 population on the agent side so forwarding entries aren't being setup and see if the issue persists?
On Jul 8, 2015 8:20 PM, "Martinx - ジェームズ" <thiagocmartinsc at gmail.com<mailto:thiagocmartinsc at gmail.com>> wrote:
On 8 July 2015 at 22:50, Jerry Zhao <xyzjerry at gmail.com<mailto:xyzjerry at gmail.com>> wrote:
Since you are using vxlan tunnel, have you increased the MTU on all compute nodes and network node to accommodate the vxlan tunnel packets?

http://docs.openstack.org/juno/config-reference/content/networking-options-plugins-ml2.html

Yes, all my VXLAN networks have MTU=1450.

I'm not seeing any problems with my VXLAN networks.

My problem lies exclusively within the "VLAN Provider Networks" / related Neutron LinuxBridges.

I'm attaching my Instances directly to a physical network of the Compute Node itself (1 tagged VLAN for each Instance). But, it doesn't work as expected.

Thanks!

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Cynthia Lopes do Sacramento



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