sys_attrs_socket man page on DigitalUNIX

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sys_attrs_socket(5)					   sys_attrs_socket(5)

NAME
       sys_attrs_socket - socket subsystem attributes

DESCRIPTION
       This  reference	page  lists  and  describes  attributes for the Socket
       (socket) kernel subsystem. Refer to the sys_attrs(5) reference page for
       an introduction to the topic of kernel subsystem attributes.

	      The  number  of lock entries to use when taking a lock reference
	      on an external cluster mbuf (more is better).

	      Default value: 64 (entries)

	      Minimum value: 0

	      Maximum value: 8192

	      The mbuf_ext_lock_count attribute is useful only on SMP machines
	      where locks are used.

	      The CPU number to which to bind the protocol timer thread.

	      Default value: 0

	      Minimum value: 0

	      Maximum value: UINT_MAX, or 4 billion

	      Maximum size of the socket buffer.

	      Default value: SB_MAX, or 1048576 (bytes)

	      Minimum value: 1

	      Maximum value: 4 billion

	      The  maximum  size  of  packets  to be copied into existing mbuf
	      clusters, or compressed. Only packets of size less  than	sbcom‐
	      press_threshold minus 1 are copied into existing mbuf clusters.

	      Default value: 0 (bytes)

	      Minimum value: 0

	      Maximum value: UINT_MAX, or 4 billion

	      If  the  sbcompress_threshold attribute value is 0, mbuf cluster
	      compression is disabled.

	      A read-only attribute that is incremented when  a	 received  SYN
	      packet  is dropped because the number of queued SYN_RCVD connec‐
	      tions for a socket is equal to that socket's backlog limit.  The
	      initial value is 0.

	      A	 read-only  attribute that shows the maximum number of pending
	      requests to any of the server sockets in the system. The initial
	      value is 0.

	      Maximum  number  of  pending  TCP connections (the socket listen
	      queue limit).

	      Default value: 1024 (connections)

	      Minimum value: 0

	      Maximum value: 65535

	      If the listen queue connection limit is too small, incoming con‐
	      nect  requests  may  be  dropped. Pending TCP connections can be
	      caused by lost packets in the  Internet  or  denial  of  service
	      attacks.

	      A	 read-only  attribute that is  incremented when a received SYN
	      packet is dropped because the number of queued SYN_RCVD  connec‐
	      tions  for  a  socket  is	 equal	to  the value of the somaxconn
	      attribute. The initial value is 0.

	      Minimum number of pending TCP  connections  (the	socket	listen
	      queue  backlog). The attribute controls how many SYN packets can
	      be handled simultaneously before additional  requests  are  dis‐
	      carded.

	      Default value: 0 (connections)

	      Minimum value: 0

	      Maximum value: 65535

	      The  value of the sominconn attribute overrides the application-
	      specific backlog if the sominconn	 value	is  greater  than  the
	      backlog requested by the application.

	      A	 value that enables (1) or disables (0)	 socket writes without
	      the need for a user space to kernel space	 copy  operation.  The
	      umc  (unified  mbuf cache) attribute is used in conjunction with
	      the mmap(2) system call.

	      Default value: 0 (disabled)

	      The size of the umc (unified mbuf cache) buffer.

	      Default value: 1024 (bytes)

	      Minimum value: 0

	      Maximum value: INT_MAX, or 2 billion

SEE ALSO
       sys_attrs(5)

       Tuning Tru64 UNIX for  Internet	Servers	 at  the  following  location:
       http://www.tru64unix.compaq.com/faqs/publications/internet/TITLE.HTM.

       System Configuration and Tuning

							   sys_attrs_socket(5)
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