[ovs-build] Passed: ovsrobot/ovs#1268 (series_119685 - 194a545)

Travis CI builds at travis-ci.org
Tue Jul 16 09:01:33 UTC 2019


Build Update for ovsrobot/ovs
-------------------------------------

Build: #1268
Status: Passed

Duration: 1 hr, 4 mins, and 38 secs
Commit: 194a545 (series_119685)
Author: Anju Thomas
Message: Improved Packet Drop Statistics in OVS

Currently OVS maintains explicit packet drop/error counters only on port level. Packets that are dropped as part of normal OpenFlow processing are counted in flow stats of “drop” flows or as table misses in table stats. These can only be interpreted by controllers that know the semantics of the configured OpenFlow pipeline. Without that knowledge, it is impossible for an OVS user to obtain e.g. the total number of packets dropped due to OpenFlow rules.

Furthermore, there are numerous other reasons for which packets can be dropped by OVS slow path that are not related to the OpenFlow pipeline.The generated datapath flow entries include a drop action to avoid further expensive upcalls to the slow path, but subsequent packets dropped by the datapath are not accounted anywhere.

Finally, the datapath itself drops packets in certain error situations.Also, these drops are today not accounted for.This makes it difficult for OVS users to monitor packet drop in an OVS instance and to alert a management system in case of a unexpected increase of such drops. Also OVS trouble-shooters face difficulties in analysing packet drops.

With this patch we implement following changes to address the issues mentioned above.

1. Identify and account all the silent packet drop scenarios

2. Display these drops in ovs-appctl coverage/show

A detailed presentation on this was presented at OvS conference 2017 and link for the corresponding presentation is available at:

https://www.slideshare.net/LF_OpenvSwitch/lfovs17troubleshooting-the-data-plane-in-ovs-82280329
v11: addressed comments from Eelco and Gregory from v10

Co-authored-by: Rohith Basavaraja <rohith.basavaraja at gmail.com>
Co-authored-by: Keshav Gupta <keshugupta1 at gmail.com>
Signed-off-by: Anju Thomas <anju.thomas at ericsson.com>
Signed-off-by: Rohith Basavaraja <rohith.basavaraja at gmail.com>
Signed-off-by: Keshav Gupta <keshugupta1 at gmail.com>
Signed-off-by: 0-day Robot <robot at bytheb.org>

View the changeset: https://github.com/ovsrobot/ovs/commit/194a545facf1

View the full build log and details: https://travis-ci.org/ovsrobot/ovs/builds/559318233?utm_medium=notification&utm_source=email

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