1 /* $NetBSD: param.c,v 1.40 2001/12/17 15:40:43 atatat Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1986, 1989 Regents of the University of California. 5 * All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)param.c 7.20 (Berkeley) 6/27/91 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.40 2001/12/17 15:40:43 atatat Exp $"); 45 46 #include "opt_rtc_offset.h" 47 #include "opt_sb_max.h" 48 #include "opt_sysv.h" 49 #include "opt_sysvparam.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/file.h> 58 #include <sys/callout.h> 59 #include <sys/mbuf.h> 60 #include <ufs/ufs/quota.h> 61 #include <sys/kernel.h> 62 #include <sys/utsname.h> 63 #ifdef SYSVSHM 64 #include <machine/vmparam.h> 65 #include <sys/shm.h> 66 #endif 67 #ifdef SYSVSEM 68 #include <sys/sem.h> 69 #endif 70 #ifdef SYSVMSG 71 #include <sys/msg.h> 72 #endif 73 74 #define CONFIG_FILE 75 #include "config_file.h" 76 77 /* 78 * System parameter formulae. 79 * 80 * This file is copied into each directory where we compile 81 * the kernel; it should be modified there to suit local taste 82 * if necessary. 83 * 84 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 85 */ 86 87 #ifdef TIMEZONE 88 #error TIMEZONE is an obsolete kernel option. 89 #endif 90 91 #ifdef DST 92 #error DST is an obsolete kernel option. 93 #endif 94 95 #ifndef RTC_OFFSET 96 #define RTC_OFFSET 0 97 #endif 98 99 #ifndef HZ 100 #define HZ 100 101 #endif 102 103 #ifndef MAXFILES 104 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 105 #endif 106 107 int hz = HZ; 108 int tick = 1000000 / HZ; 109 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 110 int rtc_offset = RTC_OFFSET; 111 int maxproc = NPROC; 112 int desiredvnodes = NVNODE; 113 int maxfiles = MAXFILES; 114 int ncallout = 16 + NPROC; /* size of callwheel (rounded to ^2) */ 115 u_long sb_max = SB_MAX; /* maximum socket buffer size */ 116 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 117 118 /* 119 * Various mbuf-related parameters. These can also be changed at run-time 120 * with sysctl. 121 */ 122 int nmbclusters = NMBCLUSTERS; 123 124 #ifndef MBLOWAT 125 #define MBLOWAT 16 126 #endif 127 int mblowat = MBLOWAT; 128 129 #ifndef MCLLOWAT 130 #define MCLLOWAT 8 131 #endif 132 int mcllowat = MCLLOWAT; 133 134 /* 135 * Values in support of System V compatible shared memory. XXX 136 */ 137 #ifdef SYSVSHM 138 #ifndef SHMMAX 139 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= NBPG' */ 140 #endif 141 #ifndef SHMMIN 142 #define SHMMIN 1 143 #endif 144 #ifndef SHMMNI 145 #define SHMMNI 128 /* <= SHMMMNI in shm.h */ 146 #endif 147 #ifndef SHMSEG 148 #define SHMSEG 128 149 #endif 150 #define SHMALL SHMMAXPGS 151 152 struct shminfo shminfo = { 153 SHMMAX, 154 SHMMIN, 155 SHMMNI, 156 SHMSEG, 157 SHMALL 158 }; 159 #endif 160 161 /* 162 * Values in support of System V compatible semaphores. 163 */ 164 #ifdef SYSVSEM 165 struct seminfo seminfo = { 166 SEMMAP, /* # of entries in semaphore map */ 167 SEMMNI, /* # of semaphore identifiers */ 168 SEMMNS, /* # of semaphores in system */ 169 SEMMNU, /* # of undo structures in system */ 170 SEMMSL, /* max # of semaphores per id */ 171 SEMOPM, /* max # of operations per semop call */ 172 SEMUME, /* max # of undo entries per process */ 173 SEMUSZ, /* size in bytes of undo structure */ 174 SEMVMX, /* semaphore maximum value */ 175 SEMAEM /* adjust on exit max value */ 176 }; 177 #endif 178 179 /* 180 * Values in support of System V compatible messages. 181 */ 182 #ifdef SYSVMSG 183 struct msginfo msginfo = { 184 MSGMAX, /* max chars in a message */ 185 MSGMNI, /* # of message queue identifiers */ 186 MSGMNB, /* max chars in a queue */ 187 MSGTQL, /* max messages in system */ 188 MSGSSZ, /* size of a message segment */ 189 /* (must be small power of 2 greater than 4) */ 190 MSGSEG /* number of message segments */ 191 }; 192 #endif 193 194 /* 195 * These have to be allocated somewhere; allocating 196 * them here forces loader errors if this file is omitted 197 * (if they've been externed everywhere else; hah!). 198 */ 199 struct buf *buf; 200 char *buffers; 201 202 /* 203 * These control when and to what priority a process gets after a certain 204 * amount of CPU time expires. AUTONICETIME is in seconds. 205 * AUTONICEVAL is NOT offset by NZERO, i.e. it's between PRIO_MIN and PRIO_MAX. 206 */ 207 #ifndef AUTONICETIME 208 #define AUTONICETIME (60 * 10) /* 10 minutes */ 209 #endif 210 211 #ifndef AUTONICEVAL 212 #define AUTONICEVAL 4 /* default + 4 */ 213 #endif 214 215 int autonicetime = AUTONICETIME; 216 int autoniceval = AUTONICEVAL; 217 218 /* 219 * Actual network mbuf sizes (read-only), for netstat. 220 */ 221 const int msize = MSIZE; 222 const int mclbytes = MCLBYTES; 223