[Xen-users] Xen live migration + Openvswitch give longer downtime

[agya naila <agya.naila@xxxxxxxxx>]

Hi All,

I have setup my Xen 4.2.1 from sources in Ubuntu 12.04 as domu with XM toolstack. I used Opensuse 12.3 as the DomU and create the bridge using Openvswitch. Firstly I hacked the vif-bridge of Xen in order to support Openvswitch since I am using xm tollstack. I am able to to run the DomU and Live migration using openvswitch. However, I got longer downtime (8-15s) as the result. Using basic bridge from brctl-utils the downtime is in ms. I see the log it seem VM spent a lot of time waiting for network resources.

Since I am not sure my code hacking in vif-script have the bad impact then I decided to use brcompat module to be able using brctl command and restore vif-bridge back to original. I have configured and test the scenarios using brcompat module, its improved by still the down time is too long. I got 5-6s downtime when failover occurs on my scenarios. The problem still remains the same, the VM spent a lot of time waiting for the resource. 

[2013-05-02 11:32:23 1625] DEBUG (XendDomainInfo:3015) XendDomainInfo.completeRestore

[2013-05-02 11:32:23 1625] DEBUG (XendDomainInfo:1795) Storing domain details: {'console/ring-ref': '357365', 'image/entry': '18446744071562076160', 'console/port': '2', 'store/ring-ref': '357366', 'image/loader': 'generic', 'vm': '/vm/26a013d3-fb9e-481a-0a49-6dabcfcb261a', 'control/platform-feature-multiprocessor-suspend': '1', 'image/features/auto-translated-physmap': '1', 'image/guest-os': 'linux', 'image/features/writable-descriptor-tables': '1', 'image/virt-base': '18446744071562067968', 'memory/target': '1048576', 'image/guest-version': '2.6', 'image/features/supervisor-mode-kernel': '1', 'control/platform-feature-xs_reset_watches': '1', 'description': '', 'console/limit': '1048576', 'image/paddr-offset': '0', 'image/hypercall-page': '18446744071562080256', 'image/suspend-cancel': '1', 'cpu/0/availability': 'online', 'image/features/writable-page-tables': '1', 'console/type': 'xenconsoled', 'image/supported-features': '2063', 'image/mod-start-pfn': '1', 'name': 'opensuse', 'domid': '6', 'image/xen-version': 'xen-3.0', 'image/init-p2m': '18446719884453740544', 'store/port': '1'}

[2013-05-02 11:32:23 1625] DEBUG (XendDomainInfo:3027) XendDomainInfo.completeRestore done

[2013-05-02 11:32:23 1625] DEBUG (XendDomainInfo:3028) GRE Tunnel Switching OK

[2013-05-02 11:32:24 1625] DEBUG (XendDomainInfo:1881) XendDomainInfo.handleShutdownWatch

[2013-05-02 11:32:29 1625] DEBUG (DevController:139) Waiting for devices tap2.

[2013-05-02 11:32:29 1625] DEBUG (DevController:139) Waiting for devices vif.

[2013-05-02 11:32:29 1625] DEBUG (DevController:144) Waiting for 0.

[2013-05-02 11:32:29 1625] DEBUG (DevController:628) hotplugStatusCallback /local/domain/0/backend/vif/6/0/hotplug-status.

[2013-05-02 11:32:29 1625] DEBUG (DevController:642) hotplugStatusCallback 1.

[2013-05-02 11:32:29 1625] DEBUG (DevController:139) Waiting for devices vkbd.

[2013-05-02 11:32:29 1625] DEBUG (DevController:139) Waiting for devices ioports.

As we can see above xend complete restore at 11:32:24 but got the result 11:32:29. 

Anybody have experince on it? any clues would be very appreciated.

Cheers,

Agya

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