Beware of the Kernel RTNL Mutex - Debugging Network Scalability Issues

Learn to identify and debug Linux kernel RTNL mutex contention issues that cause networking application stalls in this 31-minute conference talk. Explore the role of the RTNL (Routing Netlink) mutex as the primary lock protecting kernel networking data structures and understand why it creates major scalability bottlenecks in the networking subsystem. Discover how RTNL lock problems primarily impact control path operations like network interface management but can also affect data path performance, leading to difficult-to-diagnose application stalls. Master kernel tracing tools and debugging techniques through a real-world derived example application, examining methods to identify RTNL contention and implement effective mitigation strategies. Gain insights into ongoing upstream kernel development efforts aimed at reducing RTNL scope and learn how these changes will impact future system performance and networking application development.