cvs commit: src/sys/netinet raw_ip.c

[Bruce M Simpson]

bms         2007-03-20 13:15:20 UTC

  FreeBSD src repository

  Modified files:
    sys/netinet          raw_ip.c 
  Log:
  Increase default size of raw IP send and receive buffers to the same as
  udp_sendspace, to avoid a situation where jumbograms (datagrams > 9KB)
  are unnecessarily fragmented.
  
  A common use case for this is OSPF link-state database synchronization
  during adjacency bringup on a high speed network with a large MTU.
  
  It is not possible to auto-tune this setting until a socket is bound to
  a given interface, and because the laddr part of the inpcb tuple may be
  overridden, it makes no sense to do so. Applications may request a larger
  socket buffer size by using the SO_SENDBUF and SO_RECVBUF socket options.
  
  Certain applications such as Quagga ospfd do not probe for interface MTU
  and therefore do not increase SO_SENDBUF in this use case.
  XORP is not affected by this problem as it preemptively uses SO_SENDBUF
  and SO_RECVBUF to account for any possible additional latency in XRL IPC.
  
  PR:             kern/108375
  Requested by:   Vladimir Ivanov
  MFC after:      1 week
  
  Revision  Changes    Path
  1.170     +2 -8      src/sys/netinet/raw_ip.c