1 /* $NetBSD: param.c,v 1.56 2008/03/27 18:44:21 ad 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. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)param.c 7.20 (Berkeley) 6/27/91 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: param.c,v 1.56 2008/03/27 18:44:21 ad Exp $"); 41 42 #include "opt_hz.h" 43 #include "opt_rtc_offset.h" 44 #include "opt_sysv.h" 45 #include "opt_sysvparam.h" 46 #include "opt_nmbclusters.h" 47 #include "opt_multiprocessor.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/proc.h> 54 #include <sys/vnode.h> 55 #include <sys/file.h> 56 #include <sys/callout.h> 57 #include <sys/mbuf.h> 58 #include <ufs/ufs/quota.h> 59 #include <sys/kernel.h> 60 #include <sys/utsname.h> 61 #ifdef SYSVSHM 62 #include <machine/vmparam.h> 63 #include <sys/shm.h> 64 #endif 65 #ifdef SYSVSEM 66 #include <sys/sem.h> 67 #endif 68 #ifdef SYSVMSG 69 #include <sys/msg.h> 70 #endif 71 72 #define CONFIG_FILE 73 #include "config_file.h" 74 75 /* 76 * System parameter formulae. 77 * 78 * This file is copied into each directory where we compile 79 * the kernel; it should be modified there to suit local taste 80 * if necessary. 81 * 82 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 83 */ 84 85 #ifdef TIMEZONE 86 #error TIMEZONE is an obsolete kernel option. 87 #endif 88 89 #ifdef DST 90 #error DST is an obsolete kernel option. 91 #endif 92 93 #ifndef RTC_OFFSET 94 #define RTC_OFFSET 0 95 #endif 96 97 #ifndef HZ 98 #define HZ 100 99 #endif 100 101 #ifndef MAXFILES 102 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 103 #endif 104 105 int hz = HZ; 106 int tick = 1000000 / HZ; 107 /* can adjust 240ms in 60s */ 108 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 109 int rtc_offset = RTC_OFFSET; 110 int maxproc = NPROC; 111 int desiredvnodes = NVNODE; 112 u_int maxfiles = MAXFILES; 113 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 114 115 #ifdef MULTIPROCESSOR 116 u_int maxcpus = MAXCPUS; 117 size_t coherency_unit = COHERENCY_UNIT; 118 #else 119 u_int maxcpus = 1; 120 size_t coherency_unit = ALIGNBYTES + 1; 121 #endif 122 123 /* 124 * Various mbuf-related parameters. These can also be changed at run-time 125 * with sysctl. 126 */ 127 int nmbclusters = NMBCLUSTERS; 128 129 #ifndef MBLOWAT 130 #define MBLOWAT 16 131 #endif 132 int mblowat = MBLOWAT; 133 134 #ifndef MCLLOWAT 135 #define MCLLOWAT 8 136 #endif 137 int mcllowat = MCLLOWAT; 138 139 /* 140 * Values in support of System V compatible shared memory. XXX 141 */ 142 #ifdef SYSVSHM 143 #ifndef SHMMAX 144 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 145 #endif 146 #ifndef SHMMIN 147 #define SHMMIN 1 148 #endif 149 #ifndef SHMMNI 150 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 151 #endif 152 #ifndef SHMSEG 153 #define SHMSEG 128 154 #endif 155 #define SHMALL SHMMAXPGS 156 157 struct shminfo shminfo = { 158 SHMMAX, 159 SHMMIN, 160 SHMMNI, 161 SHMSEG, 162 SHMALL 163 }; 164 #endif 165 166 /* 167 * Values in support of System V compatible semaphores. 168 */ 169 #ifdef SYSVSEM 170 struct seminfo seminfo = { 171 SEMMAP, /* # of entries in semaphore map */ 172 SEMMNI, /* # of semaphore identifiers */ 173 SEMMNS, /* # of semaphores in system */ 174 SEMMNU, /* # of undo structures in system */ 175 SEMMSL, /* max # of semaphores per id */ 176 SEMOPM, /* max # of operations per semop call */ 177 SEMUME, /* max # of undo entries per process */ 178 SEMUSZ, /* size in bytes of undo structure */ 179 SEMVMX, /* semaphore maximum value */ 180 SEMAEM /* adjust on exit max value */ 181 }; 182 #endif 183 184 /* 185 * Values in support of System V compatible messages. 186 */ 187 #ifdef SYSVMSG 188 struct msginfo msginfo = { 189 MSGMAX, /* max chars in a message */ 190 MSGMNI, /* # of message queue identifiers */ 191 MSGMNB, /* max chars in a queue */ 192 MSGTQL, /* max messages in system */ 193 MSGSSZ, /* size of a message segment */ 194 /* (must be small power of 2 greater than 4) */ 195 MSGSEG /* number of message segments */ 196 }; 197 #endif 198 199 /* 200 * Actual network mbuf sizes (read-only), for netstat. 201 */ 202 const int msize = MSIZE; 203 const int mclbytes = MCLBYTES; 204