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A new configuration option called "ovn_emit_need_to_frag" has been added and defaults to False. Reason being, it requires a specific kernel version for it to work (upstream >= 5.2). It's also possible to find out if OVN supports that operation by running the following command as root: $ ovs-appctl -t ovs-vswitchd dpif/show-dp-features br-int (check for "Check pkt length action: Yes"). WARNING: Enabling this option without kernel support will result in a real performance degradation. At earlier versions of this patch we thought about having networking-ovn to discover if this option is supported or not (by issuing that ovs-appctl command above) but, since networking-ovn doesn't run in the network nodes we thought that an upper level tool (such as puppet-ovn or TripleO) could do a better job at checking for it and configuring things accordingly. Closes-Bug: #1838405 Change-Id: I089f95b40803a6cd5e01990acacd599ced3bbd91 Signed-off-by: Lucas Alvares Gomes <lucasagomes@gmail.com>changes/66/671766/9
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--- |
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features: |
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Adds a new configuration option called ``ovn_emit_need_to_frag`` |
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which defaults to False. When enabled, networking-ovn will configure |
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OVN into emitting ICMP "need to frag" packets whenever needed. By |
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default this option is disabled because it requires a newer kernel |
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version for it to work (upstream >= 5.2). It's also possible to find |
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out if it's supported by the host by running the following command |
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as root: ``ovs-appctl -t ovs-vswitchd dpif/show-dp-features br-int`` |
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(check for "Check pkt length action: Yes"). |
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