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sys_attrs_socket(5)
Contents
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sys_attrs_socket - socket subsystem attributes
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 sbcompress_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 connections 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 connect 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 connections 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 discarded.
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
sys_attrs(5)
Tuning Tru64 UNIX for Internet Servers at the following
location: http://www.tru64unix.compaq.com/faqs/publica-
tions/internet/TITLE.HTM.
System Configuration and Tuning
sys_attrs_socket(5)
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