ITPUB

Sep 28, 2016 · Backend Development

Why Enabling Multipath Routing Shrinks the FIB Table: Uncovering a Hidden Linux Kernel Bug

A long‑standing Linux kernel bug causes the FIB routing hash table to shrink from 256 to 2 entries when multipath routing is enabled, leading to performance degradation; the article explains the faulty macros, traces the communication with the original authors, and advises applying the upstream fix or patching locally.