Perl 6 - the future is here, just unevenly distributed

IRC log for #fuel, 2015-11-17

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14:58 ericjwolf Good morning.  I have been fighting another issue in my deployment.  I have 9 servers, 3 Controllers (with Mongodb), 1 Cinder, and 5 Compute. I keep getting a error with the computes are deployed.  It is not clear in the logs what the issue is but I see this error int he log:
14:58 ericjwolf Could not evaluate: Could not find init script or upstart conf file for 'qemu-kvm'
14:59 ericjwolf Plus a bunch of other trace back.  Did a bug search but did not see anything for the computes (saw something for Cinder and nuetron).
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19:35 aglarendil ericjwolf: do you have any other errors except for this one?
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21:39 ericjwolf When fuel setups the OVS and the bridges, it creates a br-aux.  What is br-aux actually used for?
21:40 ericjwolf br-storage and br-mgmt are linux bridges.  Then you have the br-floating and the br-int.
21:46 aglarendil br-floating and br-int are OVS bridges. br-aux is a linux bridge to which you can patch br-prv, for instance. br-aux is controlled by fuel, br-prv is controlled by OpenStack
21:46 aglarendil ericjwolf: ^^
21:46 aglarendil we faced some issues with OVS stability, so we use OVS only for OpenStack entities
21:47 aglarendil while real interfaces are connected to Linux native bridges and bonds
21:47 ericjwolf when you say you faced OVS stability, you mena when fuel tried to deploy them?
21:48 ericjwolf so I have a pair of 10G bonded.  I use the same 10G for Mgmt, storage, interVM, and I am using OVS to terminate traffic directly to the compute.  not using L3 agent.
21:49 ericjwolf I am a bit concerned with throughput with a br to a br.
21:50 ericjwolf in my case it would be bond0 - br-aux - br-app -> neutron network -> VM
21:51 ericjwolf then you would have bond0 - br-aux - br-prv - physnet2 - interVM network - vm
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22:24 aglarendil if you use OVS for base system bridges, such as br-mgmt or br-storage you might get into situation of OVS hanging and crashing
22:24 aglarendil also OVS is behaving poorly on a big pps frequency
22:24 aglarendil it is ok to have it for OpenStack, but we do not want to rely on it for base system
22:25 aglarendil nevertheless you can pick OVS bonds or bridges by modifying network_scheme for the node
22:25 ericjwolf Then it looks like you use br-aux as a "hook" for priv networks between ovs and linux bridge.
22:25 aglarendil but we do not recommend to us OVS bonds and bridges for non-OpenStack
22:25 ericjwolf now do you see real customers being ok with this layout?
22:25 aglarendil exactly
22:26 aglarendil we use br-aux for this purpose
22:26 aglarendil yep, it works much better than with OVS processing base system traffic
22:26 aglarendil moreover OVS bonds from our experience were unstable in production use cases
22:26 aglarendil especially for 10G interfaces
22:27 aglarendil we faced it in real life
22:27 aglarendil what we have right now is a pure 65000 MTU set within the virtual topology and real MTU is set only on hardware interfaces
22:28 aglarendil thus we decreased packets per seconds making even GRE segmentation work close to wire speed with 9000 MTU for 20Gig bonds
22:29 aglarendil if you set MTU higher, you should be able to get even 40Gigs, but it is all because we try to decrease packet rate as much as possible
22:29 aglarendil with big pps OVS is still bad even with megaflows
22:29 ericjwolf yeah, we have seen some bad performance with OVS.
22:30 aglarendil from our experince megaflows can even make things worse if they group too much of the flows for the same CPU core leaving other cores unused
22:30 aglarendil so  the next step for us will be enabling DPDK to avoid such issues, or using SR-IOV, but I cannot surely tell whether they will get into 8.0
22:31 aglarendil it seems new OVS incarnation called OVN should fix the issues, but it seems to gonna happen when Marty McFly finally gets his hoverboard :)
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