Wednesday, 2017-04-19

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masberhi, is there a performance penalization running ovs on kernel 3.10>00:48
masber?00:48
masberthe reason I am asking is because I am experiencing a poor network performance between vms running on same host00:50
masberfor example I am running openstack ocata on centos 700:51
masberiperf shows me a bandwidth of 17.5Gigs/sec00:51
masberI asked this question on #openstack and found a person who got 40Gigs/sec00:52
masberthe difference is that the other person was using ubuntu00:52
masberwith kernel 4.100:52
masberthat is the reason I am asking is the kernel plays such an important role on ovs performance00:53
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openstackgerritDong Jun proposed openstack/networking-ovn master: Call idlutils.get_schema_helper instead of idlutils._get_schema_helper  https://review.openstack.org/45784402:32
openstackgerritIhar Hrachyshka proposed openstack/networking-ovn master: Disable new N537 hacking check from next neutron-lib  https://review.openstack.org/45710903:04
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numansmasber, are you using with OVN ?05:45
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masbernumans, yes I am using ovs and firewall = ovsswitch so no hybrid iptables05:46
masbertap devices are connected to ovs and not to linux bridge05:46
masberI am not an expert here, I am learning little by little05:46
numansmasber, i meant ML2 OVN driver + OVN05:47
numansor neutron ML2 ovs05:47
masbersorry I misunderstood05:47
masberhow can I know?05:48
numansmasber, from your answer i suspect you are using the reference neutron ML2 ovs05:48
numansmasber, check the value of mech_driver in /etc/neutron/plugins/ml2_conf.ini05:49
numansmasber, i may be a little wrong with the path :)05:49
numansmasber, if you are using OVN, our testing has shown that vms running on same host (belonging to the same network) has performance hit05:50
masberhttp://paste.openstack.org/show/606942/05:50
numansmasber, ok, its ML2 ovs05:51
numansand not OVN05:51
numansso not sure why you are seeing this issue :)05:51
masberfrom your experience, which bandwidth do you see across vm on same host?05:52
masberand do you think the kernel may impact the performance?05:52
numansmasber, don't remember exactly05:52
numansmasber, i think so05:52
numansmasber, you are using centos right ?05:52
masberI was talking with SamYaple from #openstack and he got 40Gigs/sec on his lab05:53
numansmasber, i suggest you update your centos kernel to the latest one and see if there are any improvements - http://elrepo.org/tiki/kernel-ml05:53
masberI am getting 17.5Gigs/sec which less than 50% performance so I am guessing I have a lot of things to customise05:54
numansmasber, other suggestion  is  to build the ovs kernel module from sources and see how it performs05:54
masberthe differences between his lab and my env were that he is using ubuntu 16.04 (kernel 4.1) and DPDK and SR-IOV05:55
masberand I am running centos 7.3 (kernel 3.1) no DPDK and no SR-IOV05:56
switchcademasber: DPDK and SR-IOV are major changes that affect performance05:56
numansmasber, ok. I don't know too much of DPDK, but I think DPDK should give a better performance05:57
masberok, I will check enabling those feature and see05:59
masberI am reinstalling my hosts using ubuntu for another test, these way I can see what is the impact of the kernel06:00
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masberI will come back to you with the outcome if you are interested06:05
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elurkkiWhat could be the problem when neutron gives error "Failed to bind port 7f03d3ae-a657-4f5a-aed6-a90c56bc09ea on host compute2" after adding new compute node ? Thanks a lot for tips06:26
elurkkiCentOS 7, sealert doesn't give any alerts06:26
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elurkkiDoh, hostname was not set and that caused Failed to bind error07:04
masber elurkki, also check your nic is up and running07:06
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arslanq numans: Since i was trying DPDK with OVN, it seems like networking_ovn bug because i can make sure the configuration by manually creating ports of type dpdkvhostuser. These are exact nova logs: https://pastebin.mozilla.org/901940809:15
arslanqnumans: It looks like that  nova does not get the path that we are giving in ml2 conf i.e vhost_sock_dir09:16
arslanqnumans: I am not sure how to debug this issue09:17
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openstackgerritLucas Alvares Gomes proposed openstack/networking-ovn master: Acknowledge Neutron that DHCP has changed  https://review.openstack.org/45803511:47
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openstackgerritLucas Alvares Gomes proposed openstack/networking-ovn master: Acknowledge Neutron that DHCP has changed  https://review.openstack.org/45803511:56
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arslanqnumans: did you get a chance to see the logs i posted above12:04
numansarslanq, nope12:05
arslanqnumans: Since i was trying DPDK with OVN, it seems like networking_ovn bug because i can make sure the configuration by manually creating ports of type dpdkvhostuser. These are exact nova logs: https://pastebin.mozilla.org/901940812:06
arslanqIt looks like that  nova does not get the path that we are giving in ml2 conf i.e vhost_sock_dir12:06
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openstackgerritRussell Bryant proposed openstack/networking-ovn master: Repair master CI unit test and python3.5 dsvm functional test  https://review.openstack.org/45744012:41
numansarslanq, can you please create a bug in networking_ovn12:41
arslanqnumans: I am debugging it more, i'll let you know12:44
numansarslanq, thanks12:45
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arslanqnumans: I am only stuck on DPDK otherwise i have tested other advanced features with OVN12:46
numansarslanq,  you are using newton right12:47
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arslanqnumans: Yes i am using Newton with L3-agent13:11
arslanqnumans: I read the release-spec, DPDK is supported with OVN with l3-agent......please correct me if i am wrong13:13
lucasagomesbtw folks: https://review.openstack.org/#/c/458075/13:35
lucasagomesit's just adding networking-ovn to reviewstats13:35
numanslucasagomes++13:45
russellblucasagomes: approved13:56
lucasagomesty!13:57
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openstackgerritLucas Alvares Gomes proposed openstack/networking-ovn master: Acknowledge Neutron that DHCP has changed  https://review.openstack.org/45803514:22
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openstackgerritMerged openstack/networking-ovn master: Repair master CI unit test and python3.5 dsvm functional test  https://review.openstack.org/45744015:32
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arslanqnumans: This is confirmed bug, i just tried on OVS its working with openvswitch-agent15:42
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arslanqnumans: russellb: https://bugs.launchpad.net/networking-ovn/+bug/168421916:06
openstackLaunchpad bug 1684219 in networking-ovn "vhostuser_sock_path not present in vif_details" [Undecided,New]16:06
numansarslanq, thanks for reporting the bug16:08
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numansarslanq, is it possible for you to reproduce the bug in the networking-ovn master ?16:08
numansif it is reproducible in master, the fix should first go to master before it is backported to ocata and newton16:09
arslanqnumans: Yes i am looking at the code on both master and newton branch....both are different....let me try with hot patch16:17
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arslanqnumans: Hot patch did not clarify it, i would have to check it on a new setup with on master. I'll let you know16:42
arslanqnumans: Does networking_ovn (master) work with openstack stable/newton16:43
arslanqnumans: sorry with openstack stable/ocata16:43
russellbit's not tested, so maybe, but it could break at any time if it does work16:43
arslanqrussellb: I think just to test the above issue i think it should not be an issue16:44
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openstackgerritGuoshuai Li proposed openstack/networking-ovn master:  Bug Fix For QOS  https://review.openstack.org/45751817:51
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openstackgerritArslan Qadeer proposed openstack/networking-ovn master: In OvS 2.6,The NorthDB used “policing_burst”,“policing_rate” to config QoS, But in OvS2.7 , It changed by “qos_burst”, “qos_max_rate”. BUG-ID: 1683073  https://review.openstack.org/45819518:28
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ZiLi0nhello, how can port_security be disabled by default, so that spoofing is allowed?22:10
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