Re: [Xen-API] [XCP-1.1] High OVS cpu load and unresponsive host network while VMPR archive phase is running

[Ben Pfaff <blp@xxxxxxxxxxxxxxx>]

Christian Fischer <christian.fischer@xxxxxxxxxxxxxxxxxxx> writes:

> On Monday 13 August 2012 21:55:22 Ben Pfaff wrote:
>> Christian Fischer <christian.fischer@xxxxxxxxxxxxxxxxxxx> writes:
>> > On Friday 03 August 2012 10:01:34 Christian Fischer wrote:
>> >> On Thursday 02 August 2012 23:46:18 George Shuklin wrote:
>> >> > In product environment I saw that behavior few times. ovs-* processes
>> >> > starts to consume lot of cpu (over 100%) and start to cause packets
>> >> > drops.
>> >> > 
>> >> > That usually happens with 'hacked' customer VMs (sudden spike of
>> >> > outgoing traffic, cpu, and in few cases we assisted in research,
>> >> > actual trojans running on server because of some stupid php
>> >> > misconfiguration in yet another phpbb/cms/durpal/etc).
>> >> 
>> >> We have no customer VMs there, and we watch the vm traffic. Nothing
>> >> unusual. The archive phase is running. It's 100% reproducible.
>> >> 
>> >> I suppose that, in my case, it has something to do with with the
>> >> OpenFlow controller (Citrix DVS Controller) we tried to evaluate.
>> >> Currently we do some tests in an testing environment to work out the
>> >> problem.
>> > 
>> > Ben, Jesse
>> > 
>> > can you explain what's going on here? That's on an clean installation, no
>> > flow controller (which had connection issues). Is that normal? Is the
>> > amount of load shifting ok for Gbit ports?
>> 
>> Nothing here looks too bad at first glance.  Perhaps the code to
>> balance bonds can be improved, but that's all I see.
>
> Good, the poll_loop messages are no reason to be panic? Are they "normal"?

They are normal in a case where there is a significant number of
new flows appearing during a period of time.  They simply
indicate that OVS had to wake up fairly often for a while to
service these new flows.

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