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Make this actually work if the BUFCACHE option is not specified, by falling

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back on the traditional BSD formula of 10% of first 2MB and 5% of remaining.
This commit is contained in:
thorpej 1999-05-20 20:01:28 +00:00
parent 332dd60029
commit 3aa41b1b36
1 changed files with 20 additions and 5 deletions
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25
sys/kern/kern_allocsys.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_allocsys.c,v 1.1 1999/05/20 05:59:52 lukem Exp $ */ /* $NetBSD: kern_allocsys.c,v 1.2 1999/05/20 20:01:28 thorpej Exp $ */
/*- /*-
* Copyright (c) 1999 The NetBSD Foundation, Inc. * Copyright (c) 1999 The NetBSD Foundation, Inc.
@ -107,6 +107,7 @@
# error BUFCACHE is not between 5 and 95 # error BUFCACHE is not between 5 and 95
# endif # endif
#else #else
/* Default to 10% of first 2MB and 5% of remaining. */
# define BUFCACHE 0 # define BUFCACHE 0
#endif #endif
@ -151,11 +152,25 @@ allocsys(v, mdcallback)
/* /*
* Determine how many buffers to allocate. * Determine how many buffers to allocate.
* We allocate bufcache % of memory for buffer space. *
* - If bufcache is specified, use that % of memory
* for the buffer cache.
*
* - Otherwise, we default to the traditional BSD
* formula of 10% of the first 2MB and 5% of
* the remaining.
*/ */
if (bufpages == 0) {
if (bufpages == 0) if (bufcache != 0)
bufpages = physmem / CLSIZE * bufcache / 100; bufpages = physmem / CLSIZE * bufcache / 100;
else {
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (btoc(2 * 1024 * 1024) + physmem) /
(20 * CLSIZE);
}
}
#ifdef DIAGNOSTIC #ifdef DIAGNOSTIC
if (bufpages == 0) if (bufpages == 0)