The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/TUNABLE

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
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    1 The following parameters should be tunable at compile time. Some of them
    2 exist as sysctls too.
    3 
    4 This is far from complete
    5 
    6 Item                    Description
    7 ----------------------------------------------------------------------------
    8 MAX_LINKS               Maximum number of netlink minor devices. (1-32)
    9 RIF_TABLE_SIZE          Token ring RIF cache size (tunable)
   10 AARP_HASH_SIZE          Size of Appletalk hash table (tunable)
   11 AX25_DEF_T1             AX.25 parameters. These are all tunable via
   12 AX25_DEF_T2             SIOCAX25SETPARMS
   13 AX25_DEF_T3             T1-T3,N2 have the meanings in the specification
   14 AX25_DEF_N2
   15 AX25_DEF_AXDEFMODE      8 = normal 128 is PE1CHL extended
   16 AX25_DEF_IPDEFMODE      'D' - datagram  'V' - virtual connection
   17 AX25_DEF_BACKOFF        'E'xponential 'L'inear
   18 AX25_DEF_NETROM         Allow netrom 1=Y
   19 AX25_DF_TEXT            Allow PID=Text 1=Y
   20 AX25_DEF_WINDOW         Window for normal mode
   21 AX25_DEF_EWINDOW        Window for PE1CHL mode
   22 AX25_DEF_DIGI           1 for inband 2 for cross band 3 for both
   23 AX25_DEF_CONMODE        Allow connected modes 1=Yes
   24 AX25_ROUTE_MAX          AX.25 route cache size - no currently tunable
   25 Unnamed (16)            Number of protocol hash slots (tunable)
   26 DEV_NUMBUFFS            Number of priority levels (not easily tunable)
   27 Unnamed (300)           Maximum packet backlog queue (tunable)
   28 MAX_IOVEC               Maximum number of iovecs in a message (tunable)
   29 MIN_WINDOW              Offered minimum window (tunable)
   30 MAX_WINDOW              Offered maximum window (tunable)
   31 MAX_HEADER              Largest physical header (tunable)
   32 MAX_ADDR_LEN            Largest physical address (tunable)
   33 SOCK_ARRAY_SIZE         IP socket array hash size (tunable)
   34 IP_MAX_MEMBERSHIPS      Largest number of groups per socket (BSD style) (tunable)
   35 16                      Hard coded constant for amount of room allowed for
   36                         cache align and faster forwarding (tunable)
   37 IP_FRAG_TIME            Time we hold a fragment for. (tunable)
   38 PORT_MASQ_BEGIN         First port reserved for masquerade (tunable)
   39 PORT_MASQ_END           Last port used for masquerade   (tunable)
   40 MASQUERADE_EXPIRE_TCP_FIN       Time we keep a masquerade for after a FIN
   41 MASQUERADE_EXPIRE_UDP   Time we keep a UDP masquerade for (tunable)
   42 MAXVIFS                 Maximum mrouted vifs (1-32)
   43 MFC_LINES               Lines in the multicast router cache (tunable)
   44 
   45 NetROM parameters are tunable via an ioctl passing a struct
   46 
   47 4000                    Size a Unix domain socket malloc falls back to 
   48                         (tunable) should be 8K - a bit for 8K machines like
   49                         the ALPHA
   50 

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