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BUFCACHE option.

This commit is contained in:
minoura 1998-11-29 16:20:13 +00:00
parent 933646a42b
commit e01f39790b
1 changed files with 40 additions and 17 deletions
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57
sys/arch/x68k/x68k/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.44 1998/10/19 22:09:19 tron Exp $ */
/* $NetBSD: machdep.c,v 1.45 1998/11/29 16:20:13 minoura Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -156,6 +156,12 @@ int bufpages = BUFPAGES;
#else
int bufpages = 0;
#endif
#ifdef BUFCACHE
int bufcache = BUFCACHE; /* % of RAM to use for buffer cache */
#else
int bufcache = 0; /* fallback to old algorithm */
#endif
caddr_t msgbufaddr;
int maxmem; /* max memory per process */
int physmem = MAXMEM; /* max supported memory, changes to actual */
@ -342,23 +348,40 @@ again:
valloc(msqids, struct msqid_ds, msginfo.msgmni);
#endif
/*
* Determine how many buffers to allocate.
* Since HPs tend to be long on memory and short on disk speed,
* we allocate more buffer space than the BSD standard of
* use 10% of memory for the first 2 Meg, 5% of remaining.
* We just allocate a flat 10%. Insure a minimum of 16 buffers.
* We allocate 1/2 as many swap buffer headers as file i/o buffers.
*/
if (bufpages == 0)
bufpages = physmem / 10 / CLSIZE;
#if 0
if (physmem < btoc(2 * 1024 * 1024))
if (bufpages == 0) {
if (bufcache == 0) { /* use old algorithm */
/*
* Determine how many buffers to allocate.
* Since an x68k tends to be long on memory and short
* on disk speed, we allocate more buffer space than
* the BSD standard of use 10% of memory for the first
* 2 Meg, 5% of remaining.
* We just allocate a flat 10%. Insure a minimum of 16
* buffers.
* We allocate 1/2 as many swap buffer headers as file
* i/o buffers.
*/
bufpages = physmem / 10 / CLSIZE;
else
bufpages = (btoc(2 * 1024 * 1024) + physmem) /
(20 * CLSIZE);
#endif
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / 10 / CLSIZE;
else
bufpages = (btoc(2 * 1024 * 1024) + 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)