d621e29eca
on the amount of physical memory and limited by NMBCLUSTERS if present. Architectures without direct mapping also limit it based on the kmem_map size, which is used as backing store. On i386 and ARM, the maximum KVA used for mbuf clusters is limited to 64MB by default. The old default limits and limits based on GATEWAY have been removed. key_registered_sb_max is hard-wired to a value derived from 2048 clusters.
220 lines
5.7 KiB
C
220 lines
5.7 KiB
C
/* $NetBSD: param.c,v 1.63 2010/02/08 19:02:33 joerg Exp $ */
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/*
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* Copyright (c) 1980, 1986, 1989 Regents of the University of California.
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* All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.c 7.20 (Berkeley) 6/27/91
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: param.c,v 1.63 2010/02/08 19:02:33 joerg Exp $");
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#include "opt_hz.h"
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#include "opt_rtc_offset.h"
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#include "opt_sysv.h"
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#include "opt_sysvparam.h"
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#include "opt_multiprocessor.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/callout.h>
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#include <sys/mbuf.h>
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#include <ufs/ufs/quota.h>
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#include <sys/kernel.h>
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#include <sys/utsname.h>
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#include <sys/ksem.h>
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#ifdef SYSVSHM
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#include <machine/vmparam.h>
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#include <sys/shm.h>
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#endif
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#ifdef SYSVSEM
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#include <sys/sem.h>
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#endif
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#ifdef SYSVMSG
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#include <sys/msg.h>
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#endif
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/*
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* PCC cannot handle the 80KB string literal.
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*/
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#if !defined(__PCC__)
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#define CONFIG_FILE
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#include "config_file.h"
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#endif
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/*
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* System parameter formulae.
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*
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* This file is copied into each directory where we compile
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* the kernel; it should be modified there to suit local taste
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* if necessary.
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*
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* Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
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*/
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#ifdef TIMEZONE
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#error TIMEZONE is an obsolete kernel option.
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#endif
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#ifdef DST
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#error DST is an obsolete kernel option.
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#endif
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#ifndef RTC_OFFSET
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#define RTC_OFFSET 0
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#endif
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#ifndef HZ
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#define HZ 100
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#endif
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#ifndef MAXFILES
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#define MAXFILES (3 * (NPROC + MAXUSERS) + 80)
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#endif
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#ifndef MAXEXEC
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#define MAXEXEC 16
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#endif
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int hz = HZ;
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int tick = 1000000 / HZ;
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/* can adjust 240ms in 60s */
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int tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
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int rtc_offset = RTC_OFFSET;
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int maxproc = NPROC;
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int desiredvnodes = NVNODE;
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u_int maxfiles = MAXFILES;
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int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
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int maxexec = MAXEXEC; /* max number of concurrent exec() calls */
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#ifdef MULTIPROCESSOR
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u_int maxcpus = MAXCPUS;
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size_t coherency_unit = COHERENCY_UNIT;
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#else
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u_int maxcpus = 1;
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size_t coherency_unit = ALIGNBYTES + 1;
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#endif
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/*
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* Various mbuf-related parameters. These can also be changed at run-time
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* with sysctl.
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*/
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int nmbclusters = 0;
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#ifndef MBLOWAT
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#define MBLOWAT 16
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#endif
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int mblowat = MBLOWAT;
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#ifndef MCLLOWAT
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#define MCLLOWAT 8
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#endif
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int mcllowat = MCLLOWAT;
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/*
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* Values in support of System V compatible shared memory. XXX
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*/
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#ifdef SYSVSHM
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#if !defined(SHMMAX) && defined(SHMMAXPGS)
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#define SHMMAX SHMMAXPGS /* shminit() performs a `*= PAGE_SIZE' */
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#elif !defined(SHMMAX)
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#define SHMMAX 0
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#endif
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#ifndef SHMMIN
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#define SHMMIN 1
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#endif
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#ifndef SHMMNI
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#define SHMMNI 128 /* <64k, see IPCID_TO_IX in ipc.h */
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#endif
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#ifndef SHMSEG
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#define SHMSEG 128
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#endif
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struct shminfo shminfo = {
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SHMMAX,
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SHMMIN,
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SHMMNI,
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SHMSEG,
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0
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};
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#endif
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/*
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* Values in support of System V compatible semaphores.
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*/
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#ifdef SYSVSEM
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struct seminfo seminfo = {
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SEMMAP, /* # of entries in semaphore map */
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SEMMNI, /* # of semaphore identifiers */
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SEMMNS, /* # of semaphores in system */
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SEMMNU, /* # of undo structures in system */
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SEMMSL, /* max # of semaphores per id */
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SEMOPM, /* max # of operations per semop call */
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SEMUME, /* max # of undo entries per process */
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SEMUSZ, /* size in bytes of undo structure */
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SEMVMX, /* semaphore maximum value */
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SEMAEM /* adjust on exit max value */
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};
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#endif
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/*
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* Values in support of System V compatible messages.
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*/
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#ifdef SYSVMSG
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struct msginfo msginfo = {
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MSGMAX, /* max chars in a message */
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MSGMNI, /* # of message queue identifiers */
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MSGMNB, /* max chars in a queue */
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MSGTQL, /* max messages in system */
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MSGSSZ, /* size of a message segment */
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/* (must be small power of 2 greater than 4) */
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MSGSEG /* number of message segments */
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};
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#endif
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/*
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* Actual network mbuf sizes (read-only), for netstat.
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*/
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const int msize = MSIZE;
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const int mclbytes = MCLBYTES;
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/*
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* Values in support of POSIX semaphores.
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*/
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int ksem_max = KSEM_MAX;
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