1 /* $NetBSD: param.c,v 1.35 2000/04/15 16:49:35 simonb 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 "opt_rtc_offset.h" 44 #include "opt_sb_max.h" 45 #include "opt_sysv.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/socket.h> 50 #include <sys/socketvar.h> 51 #include <sys/proc.h> 52 #include <sys/vnode.h> 53 #include <sys/file.h> 54 #include <sys/callout.h> 55 #include <sys/mbuf.h> 56 #include <ufs/ufs/quota.h> 57 #include <sys/kernel.h> 58 #include <sys/utsname.h> 59 #ifdef SYSVSHM 60 #include <machine/vmparam.h> 61 #include <sys/shm.h> 62 #endif 63 #ifdef SYSVSEM 64 #include <sys/sem.h> 65 #endif 66 #ifdef SYSVMSG 67 #include <sys/msg.h> 68 #endif 69 70 /* 71 * System parameter formulae. 72 * 73 * This file is copied into each directory where we compile 74 * the kernel; it should be modified there to suit local taste 75 * if necessary. 76 * 77 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 78 */ 79 80 #ifdef TIMEZONE 81 #error TIMEZONE is an obsolete kernel option. 82 #endif 83 84 #ifdef DST 85 #error DST is an obsolete kernel option. 86 #endif 87 88 #ifndef RTC_OFFSET 89 #define RTC_OFFSET 0 90 #endif 91 92 #ifndef HZ 93 #define HZ 100 94 #endif 95 96 #ifndef MAXFILES 97 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 98 #endif 99 100 int hz = HZ; 101 int tick = 1000000 / HZ; 102 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 103 int rtc_offset = RTC_OFFSET; 104 int maxproc = NPROC; 105 int desiredvnodes = NVNODE; 106 int maxfiles = MAXFILES; 107 int ncallout = 16 + NPROC; /* size of callwheel (rounded to ^2) */ 108 u_long sb_max = SB_MAX; /* maximum socket buffer size */ 109 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 110 111 /* 112 * Various mbuf-related parameters. These can also be changed at run-time 113 * with sysctl. 114 */ 115 int nmbclusters = NMBCLUSTERS; 116 117 #ifndef MBLOWAT 118 #define MBLOWAT 16 119 #endif 120 int mblowat = MBLOWAT; 121 122 #ifndef MCLLOWAT 123 #define MCLLOWAT 8 124 #endif 125 int mcllowat = MCLLOWAT; 126 127 /* 128 * Values in support of System V compatible shared memory. XXX 129 */ 130 #ifdef SYSVSHM 131 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= NBPG' */ 132 #define SHMMIN 1 133 #define SHMMNI 128 /* <= SHMMMNI in shm.h */ 134 #define SHMSEG 32 135 #define SHMALL SHMMAXPGS 136 137 struct shminfo shminfo = { 138 SHMMAX, 139 SHMMIN, 140 SHMMNI, 141 SHMSEG, 142 SHMALL 143 }; 144 #endif 145 146 /* 147 * Values in support of System V compatible semaphores. 148 */ 149 #ifdef SYSVSEM 150 struct seminfo seminfo = { 151 SEMMAP, /* # of entries in semaphore map */ 152 SEMMNI, /* # of semaphore identifiers */ 153 SEMMNS, /* # of semaphores in system */ 154 SEMMNU, /* # of undo structures in system */ 155 SEMMSL, /* max # of semaphores per id */ 156 SEMOPM, /* max # of operations per semop call */ 157 SEMUME, /* max # of undo entries per process */ 158 SEMUSZ, /* size in bytes of undo structure */ 159 SEMVMX, /* semaphore maximum value */ 160 SEMAEM /* adjust on exit max value */ 161 }; 162 #endif 163 164 /* 165 * Values in support of System V compatible messages. 166 */ 167 #ifdef SYSVMSG 168 struct msginfo msginfo = { 169 MSGMAX, /* max chars in a message */ 170 MSGMNI, /* # of message queue identifiers */ 171 MSGMNB, /* max chars in a queue */ 172 MSGTQL, /* max messages in system */ 173 MSGSSZ, /* size of a message segment */ 174 /* (must be small power of 2 greater than 4) */ 175 MSGSEG /* number of message segments */ 176 }; 177 #endif 178 179 /* 180 * These have to be allocated somewhere; allocating 181 * them here forces loader errors if this file is omitted 182 * (if they've been externed everywhere else; hah!). 183 */ 184 struct buf *buf; 185 char *buffers; 186 187 /* 188 * These control when and to what priority a process gets after a certain 189 * amount of CPU time expires. AUTONICETIME is in seconds. 190 * AUTONICEVAL is NOT offset by NZERO, i.e. it's between PRIO_MIN and PRIO_MAX. 191 */ 192 #ifndef AUTONICETIME 193 #define AUTONICETIME (60 * 10) /* 10 minutes */ 194 #endif 195 196 #ifndef AUTONICEVAL 197 #define AUTONICEVAL 4 /* default + 4 */ 198 #endif 199 200 int autonicetime = AUTONICETIME; 201 int autoniceval = AUTONICEVAL; 202 203 /* 204 * Actual network mbuf sizes (read-only), for netstat. 205 */ 206 const int msize = MSIZE; 207 const int mclbytes = MCLBYTES; 208