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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Hello community,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">My team and I observe a strange behavior on our system with the creation of dpdk ports in OVS.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">We have a CentOS 7 system with OpenvSwitch and only one single port of type ‘dpdk’ attached to a bridge. The MTU size of the DPDK port is 9216 and the reserved HugePages for OVS are 512 x 2MB-HugePages,
e.g. 1GB of total HugePage memory.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Setting everything up works fine, however after I reboot my box, the dpdk port is in error state and I can observe this line in the logs (full logs attached to the mail):<o:p></o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:11.0pt">2019-11-02T14:46:16.914Z|00437|netdev_dpdk|ERR|Failed to create memory pool for netdev dpdk-p0, with MTU 9216 on socket 0: Invalid argument<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:11.0pt">2019-11-02T14:46:16.914Z|00438|dpif_netdev|ERR|Failed to set interface dpdk-p0 new configuration<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">I figured out that by restarting the openvswitch process, the issue with the port is resolved and it is back in a working state. However, as soon as I reboot the system a second time, the port
comes up in error state again.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Now, we have also observed a couple of other workarounds that I can’t really explain why they help:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt">When there is also a VM deployed on the system that is using ports of type ‘dpdkvhostuserclient’, we never see any issues like that. (MTU
size of the VM ports is 9216 by the way)<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt">When we increase the HugePage memory for OVS to 2GB, we also don’t see any issues.<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span lang="EN-US" style="font-size:11.0pt">Lowering the MTU size of the ‘dpdk’ type port to 1500 also helps to prevent this issue.<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Can anyone explain this?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">We’re using the following versions:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Openvswitch: 2.9.3<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">DPDK: 17.11.5<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Appreciate any help!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt">Tobias<o:p></o:p></span></p>
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