1 /* $OpenBSD: param.c,v 1.18 2002/02/17 22:59:53 maja Exp $ */ 2 /* $NetBSD: param.c,v 1.16 1996/03/12 03:08:40 mrg Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 6 * All rights reserved. 7 * (c) UNIX System Laboratories, Inc. 8 * All or some portions of this file are derived from material licensed 9 * to the University of California by American Telephone and Telegraph 10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 11 * the permission of UNIX System Laboratories, Inc. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * @(#)param.c 7.20 (Berkeley) 6/27/91 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/socket.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/file.h> 50 #include <sys/timeout.h> 51 #include <sys/mbuf.h> 52 #include <ufs/ufs/quota.h> 53 #include <sys/kernel.h> 54 #include <sys/utsname.h> 55 #ifdef SYSVSHM 56 #include <machine/vmparam.h> 57 #include <sys/shm.h> 58 #endif 59 #ifdef SYSVSEM 60 #include <sys/sem.h> 61 #endif 62 #ifdef SYSVMSG 63 #include <sys/msg.h> 64 #endif 65 66 /* 67 * System parameter formulae. 68 * 69 * This file is copied into each directory where we compile 70 * the kernel; it should be modified there to suit local taste 71 * if necessary. 72 * 73 * Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx 74 */ 75 76 #ifndef TIMEZONE 77 # define TIMEZONE 0 78 #endif 79 #ifndef DST 80 # define DST 0 81 #endif 82 #ifndef HZ 83 #define HZ 100 84 #endif 85 int hz = HZ; 86 int tick = 1000000 / HZ; 87 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 88 struct timezone tz = { TIMEZONE, DST }; 89 #define NPROC (20 + 16 * MAXUSERS) 90 int maxproc = NPROC; 91 #define NTEXT (80 + NPROC / 8) /* actually the object cache */ 92 #define NVNODE (NPROC * 2 + NTEXT + 100) 93 int desiredvnodes = NVNODE; 94 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 95 int nmbclust = NMBCLUSTERS; 96 97 #ifndef MBLOWAT 98 #define MBLOWAT 16 99 #endif 100 int mblowat = MBLOWAT; 101 102 #ifndef MCLLOWAT 103 #define MCLLOWAT 8 104 #endif 105 int mcllowat = MCLLOWAT; 106 107 108 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 109 110 /* 111 * Values in support of System V compatible shared memory. XXX 112 */ 113 #ifdef SYSVSHM 114 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 115 #define SHMMIN 1 116 #define SHMMNI 32 /* <= SHMMMNI in shm.h */ 117 #define SHMSEG 8 118 #define SHMALL (SHMMAXPGS) 119 120 struct shminfo shminfo = { 121 SHMMAX, 122 SHMMIN, 123 SHMMNI, 124 SHMSEG, 125 SHMALL 126 }; 127 #endif 128 129 /* 130 * Values in support of System V compatible semaphores. 131 */ 132 #ifdef SYSVSEM 133 struct seminfo seminfo = { 134 SEMMNI, /* # of semaphore identifiers */ 135 SEMMNS, /* # of semaphores in system */ 136 SEMMNU, /* # of undo structures in system */ 137 SEMMSL, /* max # of semaphores per id */ 138 SEMOPM, /* max # of operations per semop call */ 139 SEMUME, /* max # of undo entries per process */ 140 SEMUSZ, /* size in bytes of undo structure */ 141 SEMVMX, /* semaphore maximum value */ 142 SEMAEM /* adjust on exit max value */ 143 }; 144 #endif 145 146 /* 147 * Values in support of System V compatible messages. 148 */ 149 #ifdef SYSVMSG 150 struct msginfo msginfo = { 151 MSGMAX, /* max chars in a message */ 152 MSGMNI, /* # of message queue identifiers */ 153 MSGMNB, /* max chars in a queue */ 154 MSGTQL, /* max messages in system */ 155 MSGSSZ, /* size of a message segment */ 156 /* (must be small power of 2 greater than 4) */ 157 MSGSEG /* number of message segments */ 158 }; 159 #endif 160 161 /* 162 * These are initialized at bootstrap time 163 * to values dependent on memory size 164 */ 165 int nbuf; 166 167 /* 168 * These have to be allocated somewhere; allocating 169 * them here forces loader errors if this file is omitted 170 * (if they've been externed everywhere else; hah!). 171 */ 172 struct buf *buf, *swbuf; 173 char *buffers; 174 175 struct utsname utsname; 176