Thought I'd put this out there in case anyone else runs into it. Using DPDK 1.6 on Ubuntu 14.04 LTS in a hardware appliance. Also using KNI to share the data ports with an app that needs a normal TCP/IP stack interface.
We had everything working reasonably well on the hardware, but most of our developers run their code in a VM on their laptops: OS X (Mavericks) + VMware Fusion 6 Pro. On some VMs, we were getting errors trying to configure KNI ports: $ sudo ifconfig ffEth0 10.111.2.100 netmask 255.255.0.0 up SIOCSIFFLAGS: Timer expired SIOCSIFFLAGS: Timer expired Skipping the "fun" involved with trying to track down the problem, here's what ended up fixing it. We had 4 network ports on the VM: - eth0 - Management port - eth1 - "other" function not related to the problem - eth2 & eth3 - inline datapath (bump-in-the-wire), but also KNI mapped to ffEth0 & ffEth1 by our DPDK app If eth2 and eth3 are on the same vmnet, you'll get the "SIOCSIFFLAGS: Timer expired" errors. Depending on what parameters you try to set, ifconfig may think some of them have taken effect (they haven't) or it won't (setting the MTU, etc.). If you put eth2 and eth3 on separate vmnets, then no issues and you can configure the KNI ports via ifconfig as expected. No idea why having the ports on the same vmnet matters, since our app doesn't care, but I haven't gone spelunking through the KNI source to find the root cause. Doubtful this will matter to many (any?), but maybe it'll save someone some time. Jay Rolette *infinite io*
