net/irda/Config.help

CONFIG_IRDA
  Say Y here if you want to build support for the IrDA (TM) protocols.
  The Infrared Data Associations (tm) specifies standards for wireless
  infrared communication and is supported by most laptops and PDA's.

  To use Linux support for the IrDA (tm) protocols, you will also need
  some user-space utilities like irattach.  For more information, see
  the file <file:Documentation/networking/irda.txt>.  You also want to
  read the IR-HOWTO, available at
  <http://www.linuxdoc.org/docs.html#howto>.

  If you want to exchange bits of data (vCal, vCard) with a PDA, you
  will need to install some OBEX application, such as OpenObex :
  <http://sourceforge.net/projects/openobex/>

  This support is also available as a module called irda.o.  If you
  want to compile it as a module, say M here and read
  <file:Documentation/modules.txt>.

CONFIG_IRDA_ULTRA
  Say Y here to support the connectionless Ultra IRDA protocol.
  Ultra allows to exchange data over IrDA with really simple devices
  (watch, beacon) without the overhead of the IrDA protocol (no handshaking,
  no management frames, simple fixed header).
  Ultra is available as a special socket : socket(AF_IRDA, SOCK_DGRAM, 1);

CONFIG_IRDA_CACHE_LAST_LSAP
  Say Y here if you want IrLMP to cache the last LSAP used.  This
  makes sense since most frames will be sent/received on the same
  connection.  Enabling this option will save a hash-lookup per frame.

  If unsure, say Y.

CONFIG_IRDA_FAST_RR
  Say Y here is you want IrLAP to send fast RR (Receive Ready) frames
  when acting as a primary station.
  Disabling this option will make latency over IrDA very bad. Enabling
  this option will make the IrDA stack send more packet than strictly
  necessary, thus reduce your battery life (but not that much).

  Fast RR will make IrLAP send out a RR frame immediately when
  receiving a frame if its own transmit queue is currently empty. This
  will give a lot of speed improvement when receiving much data since
  the secondary station will not have to wait the max. turn around
  time (usually 500ms) before it is allowed to transmit the next time.
  If the transmit queue of the secondary is also empty, the primary will
  start backing-off before sending another RR frame, waiting longer
  each time until the back-off reaches the max. turn around time.
  This back-off increase in controlled via
  /proc/sys/net/irda/fast_poll_increase

  If unsure, say Y.

CONFIG_IRDA_DEBUG
  Say Y here if you want the IrDA subsystem to write debug information
  to your syslog. You can change the debug level in
  /proc/sys/net/irda/debug .
  When this option is enabled, the IrDA also perform many extra internal
  verifications which will usually prevent the kernel to crash in case of
  bugs.

  If unsure, say Y (since it makes it easier to find the bugs).