1 /* $NetBSD: param.c,v 1.32 1999/12/04 10:55:11 ragge 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 #ifdef DST 84 #error DST is an obsolete kernel option. 85 #endif 86 #ifndef RTC_OFFSET 87 #define RTC_OFFSET 0 88 #endif 89 #ifndef HZ 90 #define HZ 100 91 #endif 92 int hz = HZ; 93 int tick = 1000000 / HZ; 94 int tickadj = 240000 / (60 * HZ); /* can adjust 240ms in 60s */ 95 int rtc_offset = RTC_OFFSET; 96 int maxproc = NPROC; 97 int desiredvnodes = NVNODE; 98 int maxfiles = 3 * (NPROC + MAXUSERS) + 80; 99 int ncallout = 16 + NPROC; 100 u_long sb_max = SB_MAX; /* maximum socket buffer size */ 101 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 102 103 /* 104 * Various mbuf-related parameters. These can also be changed at run-time 105 * with sysctl. 106 */ 107 int nmbclusters = NMBCLUSTERS; 108 109 #ifndef MBLOWAT 110 #define MBLOWAT 16 111 #endif 112 int mblowat = MBLOWAT; 113 114 #ifndef MCLLOWAT 115 #define MCLLOWAT 8 116 #endif 117 int mcllowat = MCLLOWAT; 118 119 /* 120 * Values in support of System V compatible shared memory. XXX 121 */ 122 #ifdef SYSVSHM 123 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= NBPG' */ 124 #define SHMMIN 1 125 #define SHMMNI 128 /* <= SHMMMNI in shm.h */ 126 #define SHMSEG 32 127 #define SHMALL SHMMAXPGS 128 129 struct shminfo shminfo = { 130 SHMMAX, 131 SHMMIN, 132 SHMMNI, 133 SHMSEG, 134 SHMALL 135 }; 136 #endif 137 138 /* 139 * Values in support of System V compatible semaphores. 140 */ 141 #ifdef SYSVSEM 142 struct seminfo seminfo = { 143 SEMMAP, /* # of entries in semaphore map */ 144 SEMMNI, /* # of semaphore identifiers */ 145 SEMMNS, /* # of semaphores in system */ 146 SEMMNU, /* # of undo structures in system */ 147 SEMMSL, /* max # of semaphores per id */ 148 SEMOPM, /* max # of operations per semop call */ 149 SEMUME, /* max # of undo entries per process */ 150 SEMUSZ, /* size in bytes of undo structure */ 151 SEMVMX, /* semaphore maximum value */ 152 SEMAEM /* adjust on exit max value */ 153 }; 154 #endif 155 156 /* 157 * Values in support of System V compatible messages. 158 */ 159 #ifdef SYSVMSG 160 struct msginfo msginfo = { 161 MSGMAX, /* max chars in a message */ 162 MSGMNI, /* # of message queue identifiers */ 163 MSGMNB, /* max chars in a queue */ 164 MSGTQL, /* max messages in system */ 165 MSGSSZ, /* size of a message segment */ 166 /* (must be small power of 2 greater than 4) */ 167 MSGSEG /* number of message segments */ 168 }; 169 #endif 170 171 /* 172 * These have to be allocated somewhere; allocating 173 * them here forces loader errors if this file is omitted 174 * (if they've been externed everywhere else; hah!). 175 */ 176 struct callout *callout; 177 struct buf *buf; 178 char *buffers; 179 180 /* 181 * These control when and to what priority a process gets after a certain 182 * amount of CPU time expires. AUTONICETIME is in seconds. 183 * AUTONICEVAL is NOT offset by NZERO, i.e. it's between PRIO_MIN and PRIO_MAX. 184 */ 185 #ifndef AUTONICETIME 186 #define AUTONICETIME (60 * 10) /* 10 minutes */ 187 #endif 188 189 #ifndef AUTONICEVAL 190 #define AUTONICEVAL 4 /* default + 4 */ 191 #endif 192 193 int autonicetime = AUTONICETIME; 194 int autoniceval = AUTONICEVAL; 195 196 /* 197 * Actual network mbuf sizes (read-only), for netstat. 198 */ 199 const int msize = MSIZE; 200 const int mclbytes = MCLBYTES; 201