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 <stddef.h> 43 44 #include "opt_param.h" 45 46 #include <sys/param.h> 47 48 /* 49 * System parameter formulae. 50 * 51 * This file is copied into each directory where we compile 52 * the kernel; it should be modified there to suit local taste 53 * if necessary. 54 * 55 * Compiled with -DMAXUSERS=xx 56 */ 57 58 #ifndef HZ 59 #define HZ 100 60 #endif 61 int hz = HZ; 62 int tick = 1000000 / HZ; 63 int tickadj = howmany(30000, 60 * HZ); /* can adjust 30ms in 60s */ 64 #define NPROC (20 + 16 * MAXUSERS) 65 #ifndef MAXFILES 66 #define MAXFILES (NPROC*2) 67 #endif 68 int maxproc = NPROC; /* maximum # of processes */ 69 int maxprocperuid = NPROC-1; /* maximum # of processes per user */ 70 int maxfiles = MAXFILES; /* system wide open files limit */ 71 int maxfilesperproc = MAXFILES; /* per-process open files limit */ 72 int ncallout = 16 + NPROC + MAXFILES; /* maximum # of timer events */ 73 int mbuf_wait = 32; /* mbuf sleep time in ticks */ 74 75 /* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */ 76 #ifndef NSFBUFS 77 #define NSFBUFS (512 + MAXUSERS * 16) 78 #endif 79 int nsfbufs = NSFBUFS; 80 81 /* 82 * These may be set to nonzero here or by patching. 83 * If they are nonzero at bootstrap time then they are 84 * initialized to values dependent on the memory size. 85 */ 86 #ifdef NBUF 87 int nbuf = NBUF; 88 #else 89 int nbuf = 0; 90 #endif 91 int nswbuf = 0; 92 93 /* 94 * These have to be allocated somewhere; allocating 95 * them here forces loader errors if this file is omitted 96 * (if they've been externed everywhere else; hah!). 97 */ 98 struct buf *swbuf; 99