【InfiniBand】“Warning: couldn‘t open config directory ‘/etc/libibverbs.d/libibverbs.d‘.”

运行ibv_ud_pingpong出错：“Warning: couldn‘t open config directory ‘/etc/libibverbs.d/libibverbs.d‘.”

解决方法：

参考： libibverbs - RDMAmojo RDMAmojo

​​​​​​​libibverbs: Warning: couldn't open config directory '/etc/libibverbs.d'
Reason: libibverbs failed to open the directory that holds information about the installed userspace low-level driver libraries.
Cause: this usually happens when libibverbs was configured and compiled with different parameters (--sysconfdir that was provided to "configure") than the userspace low-level driver libraries.
Solution: uninstall the userspace low-level drivers and libibverbs and install them from a consistent source, or recompile all those libraries with the same parameters.

重新运行configure：

./configure --sysconfdir=/etc
make clean
make

问题解决。