Name

       BPFTUNE-UDP-BUFFER - UDP buffer bpftune plugin for managing UDP buffer sizes, memory limits

DESCRIPTION

          For UDP - like TCP - a triple of min, pressure, max represents UDP memory limits and is specified in
              net.ipv4.udp_mem

          If  receive fails with -ENOBUFS this indicates memory limits are being reached; we adaptively increase
          pressure and max to ensure that memory exhaustion does not occur (as long as we do not  approach  real
          memory  exhaustion).   As memory exhaustion is approached and we can no longer increase overall memory
          limits, reduce net.core.rmem* values to limit socket memory overheads.

          For UDP receive buffer memory, bump net.core.rmem_max if a socket  experiences  receive  buffer  drops
          within range of the rmem_max_value.  Similarly bump rmem_default if sockets are within range of it and
          do not have a locked (via setsockopt) value.

          Tunables:

          • net.ipv4.udp_mem: min, pressure, max UDP memory

          • net.core.rmem_max: max rcvbuf size specifiable via setsockopt()

          • net.core.rmem_default: default rcvbuf size where none was set

SEE ALSO

          bpf(2), bpftune(8),

                                                                                           BPFTUNE-UDP-BUFFER(8)