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Fix bufpages miscalculation. At the same time, make bufpages configurable

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att compile time.
This commit is contained in:
ragge 1998-12-19 20:06:36 +00:00
parent a127a479d7
commit 6036a3463e
1 changed files with 20 additions and 5 deletions
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25
sys/arch/vax/vax/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.67 1998/11/29 15:04:36 ragge Exp $ */
/* $NetBSD: machdep.c,v 1.68 1998/12/19 20:06:36 ragge Exp $ */
/*
* Copyright (c) 1994, 1998 Ludd, University of Lule}, Sweden.
@ -149,6 +149,11 @@ caddr_t allocsys __P((caddr_t));
#define valloclim(name, type, num, lim) \
(name) = (type *)v; v = (caddr_t)((lim) = ((name)+(num)))
#ifdef BUFCACHE
int bufcache = BUFCACHE; /* % of RAM to use for buffer cache */
#else
int bufcache = 0; /* fallback to old algorithm */
#endif
#ifdef BUFPAGES
int bufpages = BUFPAGES;
#else
@ -385,10 +390,20 @@ allocsys(v)
* buffer headers as file i/o buffers.
*/
if (bufpages == 0) {
if (physmem < btoc(2 * 1024 * 1024))
bufpages = (physmem / 10) / CLSIZE;
else
bufpages = (physmem / 20) / CLSIZE;
if (bufcache == 0) {
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / 10;
else
bufpages = physmem / 20;
} else {
if (bufcache < 5 || bufcache > 95) {
printf(
"warning: unable to set bufcache to %d%% of RAM, using 10%%",
bufcache);
bufcache = 10;
}
bufpages = physmem / 100 * bufcache;
}
}
if (nbuf == 0) {
nbuf = bufpages;