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Linux Cross Reference
Linux-2.6.17/net/TUNABLE

Version: ~ [ 2.6.16 ] ~ [ 2.6.17 ] ~
Architecture: ~ [ ia64 ] ~ [ i386 ] ~ [ arm ] ~ [ ppc ] ~ [ sparc64 ] ~

  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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