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The following parameters should be tunable at compile time. Some of them
exist as sysctls too.

This is far from complete

Item                    Description
----------------------------------------------------------------------------
MAX_LINKS               Maximum number of netlink minor devices. (1-32)
RIF_TABLE_SIZE          Token ring RIF cache size (tunable)
AARP_HASH_SIZE          Size of Appletalk hash table (tunable)
AX25_DEF_T1             AX.25 parameters. These are all tunable via
AX25_DEF_T2             SIOCAX25SETPARMS
AX25_DEF_T3             T1-T3,N2 have the meanings in the specification
AX25_DEF_N2
AX25_DEF_AXDEFMODE      8 = normal 128 is PE1CHL extended
AX25_DEF_IPDEFMODE      'D' - datagram  'V' - virtual connection
AX25_DEF_BACKOFF        'E'xponential 'L'inear
AX25_DEF_NETROM         Allow netrom 1=Y
AX25_DF_TEXT            Allow PID=Text 1=Y
AX25_DEF_WINDOW         Window for normal mode
AX25_DEF_EWINDOW        Window for PE1CHL mode
AX25_DEF_DIGI           1 for inband 2 for cross band 3 for both
AX25_DEF_CONMODE        Allow connected modes 1=Yes
AX25_ROUTE_MAX          AX.25 route cache size - no currently tunable
Unnamed (16)            Number of protocol hash slots (tunable)
DEV_NUMBUFFS            Number of priority levels (not easily tunable)
Unnamed (300)           Maximum packet backlog queue (tunable)
MAX_IOVEC               Maximum number of iovecs in a message (tunable)
MIN_WINDOW              Offered minimum window (tunable)
MAX_WINDOW              Offered maximum window (tunable)
MAX_HEADER              Largest physical header (tunable)
MAX_ADDR_LEN            Largest physical address (tunable)
SOCK_ARRAY_SIZE         IP socket array hash size (tunable)
IP_MAX_MEMBERSHIPS      Largest number of groups per socket (BSD style) (tunable)
16                      Hard coded constant for amount of room allowed for
                        cache align and faster forwarding (tunable)
IP_FRAG_TIME            Time we hold a fragment for. (tunable)
PORT_MASQ_BEGIN         First port reserved for masquerade (tunable)
PORT_MASQ_END           Last port used for masquerade   (tunable)
MASQUERADE_EXPIRE_TCP_FIN       Time we keep a masquerade for after a FIN
MASQUERADE_EXPIRE_UDP   Time we keep a UDP masquerade for (tunable)
MAXVIFS                 Maximum mrouted vifs (1-32)
MFC_LINES               Lines in the multicast router cache (tunable)

NetROM parameters are tunable via an ioctl passing a struct

4000                    Size a Unix domain socket malloc falls back to 
                        (tunable) should be 8K - a bit for 8K machines like
                        the ALPHA