1 /* 2 * Copyright (c) 1980, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)param.c 8.3 (Berkeley) 8/20/94 39 * $FreeBSD$ 40 */ 41 42 #include "opt_param.h" 43 44 #include <sys/param.h> 45 46 /* 47 * System parameter formulae. 48 * 49 * This file is copied into each directory where we compile 50 * the kernel; it should be modified there to suit local taste 51 * if necessary. 52 * 53 * Compiled with -DMAXUSERS=xx 54 */ 55 56 #ifndef HZ 57 #define HZ 100 58 #endif 59 int hz = HZ; 60 int tick = 1000000 / HZ; 61 int tickadj = howmany(30000, 60 * HZ); /* can adjust 30ms in 60s */ 62 #define NPROC (20 + 16 * MAXUSERS) 63 #ifndef MAXFILES 64 #define MAXFILES (NPROC*2) 65 #endif 66 int maxproc = NPROC; /* maximum # of processes */ 67 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 68 int maxfiles = MAXFILES; /* system wide open files limit */ 69 int maxfilesperproc = MAXFILES; /* per-process open files limit */ 70 int ncallout = 16 + NPROC + MAXFILES; /* maximum # of timer events */ 71 int mbuf_wait = 32; /* mbuf sleep time in ticks */ 72 73 /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ 74 #ifndef NSFBUFS 75 #define NSFBUFS (512 + MAXUSERS * 16) 76 #endif 77 int nsfbufs = NSFBUFS; 78 79 /* 80 * These may be set to nonzero here or by patching. 81 * If they are nonzero at bootstrap time then they are 82 * initialized to values dependent on the memory size. 83 */ 84 #ifdef NBUF 85 int nbuf = NBUF; 86 #else 87 int nbuf = 0; 88 #endif 89 int nswbuf = 0; 90 91 /* 92 * These have to be allocated somewhere; allocating 93 * them here forces loader errors if this file is omitted 94 * (if they've been externed everywhere else; hah!). 95 */ 96 struct buf *swbuf; 97 98 /* 99 * Total number of shared mutexes to protect all lockmgr locks. 100 */ 101 #ifndef LOCKMUTEX 102 #define LOCKMUTEX 10 103 #endif 104 int lock_nmtx = LOCKMUTEX; 105