Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Implement the BUFCACHE kernel config option.

This commit is contained in:
scottr 1999-03-01 21:32:24 +00:00
parent c346a6827a
commit 624b6ac9a6
1 changed files with 28 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
sys/arch/macppc/macppc/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.34 1999/02/27 06:39:36 scottr Exp $ */
/* $NetBSD: machdep.c,v 1.35 1999/03/01 21:32:24 scottr Exp $ */
/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
@ -121,6 +121,9 @@ struct pmap ofw_pmap;
int msgbufmapped = 0;
/*
* Declare these as initialized data so we can patch them.
*/
#ifdef NBUF
int nbuf = NBUF;
#else
@ -131,6 +134,11 @@ int bufpages = BUFPAGES;
#else
int bufpages = 0;
#endif
#ifdef BUFCACHE
int bufcache = BUFCACHE;
#else
int bufcache = 0;
#endif
caddr_t allocsys __P((caddr_t));
void install_extint __P((void (*)(void)));
@ -657,10 +665,26 @@ allocsys(v)
#endif
/*
* Decide on buffer space to use.
* Determine the number of pages to use for the buffer cache
* (minimum 16). Allocate 1/2 as many swap buffer headers as
* file I/O buffers.
*/
if (bufpages == 0)
bufpages = (physmem / 20) / CLSIZE;
if (bufpages == 0) {
if (bufcache == 0) { /* use old algorithm */
bufpages = (physmem / 20) / CLSIZE;
} else {
/*
* Set size of buffer cache to physmem/bufcache * 100
* (i.e., bufcache % of physmem).
*/
if (bufcache < 5 || bufcache > 95) {
printf("warning: unable to set bufcache "
"to %d%% of RAM, using 10%%", bufcache);
bufcache = 10;
}
bufpages = physmem / (CLSIZE * 100) * bufcache;
}
}
if (nbuf == 0) {
nbuf = bufpages;
if (nbuf < 16)