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BPFTUNE-IP-FRAG

IP fragmentation bpftune plugin for managing fragment reassembly memory limits

Manual section:8

DESCRIPTION

For IPv[46] fragmentation reassembly, memory is capped at

net.ipv[46].ip[6]frag_high_thresh

Fragmentation reassembly can fail if this value is set too low; monitor for fragmentation reassembly and bump value if needed.

Avoid bumping it if assembly failures are correlated with increases in frag_high_thresh; this suggests that increasing available memory does not help. While correlation is high, tune down the frag_high_thresh value.

Tunables:

  • net.ipv4.ipfrag_high_thresh: number of bytes devoted to IPv4 fragmentation reassembly; default 4MB
  • net.ipv6.ip6frag_high_thresh: number of bytes devoted to IPv6 fragmentation reassembly; default 4MB