freebsd-dev/sys/kern/subr_param.c
David Greenman cddc961a83 Made "NMBCLUSTERS" calculation dynamic and fixed bogus use of "NMBCLUSTERS"
in machdep.c (it should use the global nmbclusters). Moved the calculation
of nmbclusters into conf/param.c (same place where nmbclusters has always
been assigned), and made the calculation include an extra amount based
on "maxusers". NMBCLUSTERS can still be overrided in the kernel config
file as always, but this change will make that generally unnecessary. This
fixes the "bug" reports from people who have misconfigured kernels seeing
the network "hang" when the mbuf cluster pool runs out.

Reviewed by:	John Dyson
1995-05-25 07:36:24 +00:00

209 lines
6.1 KiB
C

/*
* Copyright (c) 1980, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)param.c 8.2 (Berkeley) 1/21/94
* $Id: param.c,v 1.8 1995/02/20 19:42:19 guido Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/callout.h>
#include <sys/clist.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <ufs/ufs/quota.h>
#ifdef SYSVSHM
#include <machine/vmparam.h>
#include <sys/shm.h>
#endif
#ifdef SYSVSEM
#include "sys/sem.h"
#endif
#ifdef SYSVMSG
#include "sys/msg.h"
#endif
/*
* System parameter formulae.
*
* This file is copied into each directory where we compile
* the kernel; it should be modified there to suit local taste
* if necessary.
*
* Compiled with -DHZ=xx -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
*/
#ifndef HZ
#define HZ 100
#endif
int hz = HZ;
int tick = 1000000 / HZ;
int tickadj = 30000 / (60 * HZ); /* can adjust 30ms in 60s */
struct timezone tz = { TIMEZONE, DST };
#define NPROC (20 + 16 * MAXUSERS)
int maxproc = NPROC; /* maximum # of processes */
int maxprocperuid = NPROC-1; /* maximum # of processes per user */
int maxfiles = NPROC*2; /* system wide open files limit */
int maxfilesperproc = NPROC*2; /* per-process open files limit */
int ncallout = 16 + NPROC; /* maximum # of timer events */
/* maximum # of mbuf clusters */
#ifndef NMBCLUSTERS
#ifdef GATEWAY
int nmbclusters = 512 + MAXUSERS * 16;
#else
int nmbclusters = 256 + MAXUSERS * 16;
#endif /* GATEWAY */
#else
int nmbclusters = NMBCLUSTERS;
#endif
int fscale = FSCALE; /* kernel uses `FSCALE', user uses `fscale' */
/*
* Values in support of System V compatible shared memory. XXX
*/
#ifdef SYSVSHM
#ifndef SHMMAX
#define SHMMAX (SHMMAXPGS*NBPG)
#endif
#ifndef SHMMIN
#define SHMMIN 1
#endif
#ifndef SHMMNI
#define SHMMNI 32 /* <= SHMMMNI in shm.h */
#endif
#ifndef SHMSEG
#define SHMSEG 8
#endif
#ifndef SHMALL
#define SHMALL (SHMMAXPGS/CLSIZE)
#endif
struct shminfo shminfo = {
SHMMAX,
SHMMIN,
SHMMNI,
SHMSEG,
SHMALL
};
#endif
/*
* Values in support of System V compatible semaphores.
*/
#ifdef SYSVSEM
struct seminfo seminfo = {
SEMMAP, /* # of entries in semaphore map */
SEMMNI, /* # of semaphore identifiers */
SEMMNS, /* # of semaphores in system */
SEMMNU, /* # of undo structures in system */
SEMMSL, /* max # of semaphores per id */
SEMOPM, /* max # of operations per semop call */
SEMUME, /* max # of undo entries per process */
SEMUSZ, /* size in bytes of undo structure */
SEMVMX, /* semaphore maximum value */
SEMAEM /* adjust on exit max value */
};
#endif
/*
* Values in support of System V compatible messages.
*/
#ifdef SYSVMSG
struct msginfo msginfo = {
MSGMAX, /* max chars in a message */
MSGMNI, /* # of message queue identifiers */
MSGMNB, /* max chars in a queue */
MSGTQL, /* max messages in system */
MSGSSZ, /* size of a message segment */
/* (must be small power of 2 greater than 4) */
MSGSEG /* number of message segments */
};
#endif
/*
* These are initialized at bootstrap time
* to values dependent on memory size
*/
int nbuf, nswbuf;
/*
* These have to be allocated somewhere; allocating
* them here forces loader errors if this file is omitted
* (if they've been externed everywhere else; hah!).
*/
struct callout *callout;
struct cblock *cfree;
struct buf *buf, *swbuf;
char *buffers;
/*
* Proc/pgrp hashing.
* Here so that hash table sizes can depend on MAXUSERS/NPROC.
* Hash size must be a power of two.
* NOW omission of this file will cause loader errors!
*/
#if NPROC > 1024
#define PIDHSZ 512
#else
#if NPROC > 512
#define PIDHSZ 256
#else
#if NPROC > 256
#define PIDHSZ 128
#else
#define PIDHSZ 64
#endif
#endif
#endif
struct proc *pidhash[PIDHSZ];
struct pgrp *pgrphash[PIDHSZ];
int pidhashmask = PIDHSZ - 1;