param.c revision 1.53
1 /* $NetBSD: param.c,v 1.53 2007/12/26 16:01:35 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 1.53 2007/12/26 16:01:35 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 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/socket.h> 51 #include <sys/socketvar.h> 52 #include <sys/proc.h> 53 #include <sys/vnode.h> 54 #include <sys/file.h> 55 #include <sys/callout.h> 56 #include <sys/mbuf.h> 57 #include <ufs/ufs/quota.h> 58 #include <sys/kernel.h> 59 #include <sys/utsname.h> 60 #ifdef SYSVSHM 61 #include <machine/vmparam.h> 62 #include <sys/shm.h> 63 #endif 64 #ifdef SYSVSEM 65 #include <sys/sem.h> 66 #endif 67 #ifdef SYSVMSG 68 #include <sys/msg.h> 69 #endif 70 71 #define CONFIG_FILE 72 #include "config_file.h" 73 74 /* 75 * System parameter formulae. 76 * 77 * This file is copied into each directory where we compile 78 * the kernel; it should be modified there to suit local taste 79 * if necessary. 80 * 81 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx 82 */ 83 84 #ifdef TIMEZONE 85 #error TIMEZONE is an obsolete kernel option. 86 #endif 87 88 #ifdef DST 89 #error DST is an obsolete kernel option. 90 #endif 91 92 #ifndef RTC_OFFSET 93 #define RTC_OFFSET 0 94 #endif 95 96 #ifndef HZ 97 #define HZ 100 98 #endif 99 100 #ifndef MAXFILES 101 #define MAXFILES (3 * (NPROC + MAXUSERS) + 80) 102 #endif 103 104 int hz = HZ; 105 int tick = 1000000 / HZ; 106 /* can adjust 240ms in 60s */ 107 int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1; 108 int rtc_offset = RTC_OFFSET; 109 int maxproc = NPROC; 110 int desiredvnodes = NVNODE; 111 u_int maxfiles = MAXFILES; 112 int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */ 113 114 /* 115 * Various mbuf-related parameters. These can also be changed at run-time 116 * with sysctl. 117 */ 118 int nmbclusters = NMBCLUSTERS; 119 120 #ifndef MBLOWAT 121 #define MBLOWAT 16 122 #endif 123 int mblowat = MBLOWAT; 124 125 #ifndef MCLLOWAT 126 #define MCLLOWAT 8 127 #endif 128 int mcllowat = MCLLOWAT; 129 130 /* 131 * Values in support of System V compatible shared memory. XXX 132 */ 133 #ifdef SYSVSHM 134 #ifndef SHMMAX 135 #define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */ 136 #endif 137 #ifndef SHMMIN 138 #define SHMMIN 1 139 #endif 140 #ifndef SHMMNI 141 #define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */ 142 #endif 143 #ifndef SHMSEG 144 #define SHMSEG 128 145 #endif 146 #define SHMALL SHMMAXPGS 147 148 struct shminfo shminfo = { 149 SHMMAX, 150 SHMMIN, 151 SHMMNI, 152 SHMSEG, 153 SHMALL 154 }; 155 #endif 156 157 /* 158 * Values in support of System V compatible semaphores. 159 */ 160 #ifdef SYSVSEM 161 struct seminfo seminfo = { 162 SEMMAP, /* # of entries in semaphore map */ 163 SEMMNI, /* # of semaphore identifiers */ 164 SEMMNS, /* # of semaphores in system */ 165 SEMMNU, /* # of undo structures in system */ 166 SEMMSL, /* max # of semaphores per id */ 167 SEMOPM, /* max # of operations per semop call */ 168 SEMUME, /* max # of undo entries per process */ 169 SEMUSZ, /* size in bytes of undo structure */ 170 SEMVMX, /* semaphore maximum value */ 171 SEMAEM /* adjust on exit max value */ 172 }; 173 #endif 174 175 /* 176 * Values in support of System V compatible messages. 177 */ 178 #ifdef SYSVMSG 179 struct msginfo msginfo = { 180 MSGMAX, /* max chars in a message */ 181 MSGMNI, /* # of message queue identifiers */ 182 MSGMNB, /* max chars in a queue */ 183 MSGTQL, /* max messages in system */ 184 MSGSSZ, /* size of a message segment */ 185 /* (must be small power of 2 greater than 4) */ 186 MSGSEG /* number of message segments */ 187 }; 188 #endif 189 190 /* 191 * Actual network mbuf sizes (read-only), for netstat. 192 */ 193 const int msize = MSIZE; 194 const int mclbytes = MCLBYTES; 195
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