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Support BUFCACHE option (stolen from i386).

This commit is contained in:
matthias 1999-01-15 07:43:48 +00:00
parent 88b2c1662d
commit 2dff258464
2 changed files with 51 additions and 15 deletions
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8
sys/arch/pc532/include/vmparam.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: vmparam.h,v 1.14 1998/09/02 19:17:23 matthias Exp $ */
/* $NetBSD: vmparam.h,v 1.15 1999/01/15 07:43:48 matthias Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
@ -148,6 +148,12 @@
/* APTDPTDI << PDSHIFT */
#define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xFF800000)
/* XXX max. amount of KVM to be used by buffers. */
#ifndef VM_MAX_KERNEL_BUF
#define VM_MAX_KERNEL_BUF \
((VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) * 7 / 10)
#endif
/* virtual sizes (bytes) for various kernel submaps */
#define VM_MBUF_SIZE (NMBCLUSTERS*MCLBYTES)
#define VM_KMEM_SIZE (NKMEMCLUSTERS*CLBYTES)

58
sys/arch/pc532/pc532/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.91 1999/01/09 22:10:20 thorpej Exp $ */
/* $NetBSD: machdep.c,v 1.92 1999/01/15 07:43:48 matthias Exp $ */
/*-
* Copyright (c) 1996 Matthias Pfaller.
@ -182,6 +182,11 @@ 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
int maxphysmem = 0;
int physmem;
@ -455,23 +460,49 @@ allocsys(v)
#endif
/*
* Determine how many buffers to allocate. We use 10% of the
* first 2MB of memory, and 5% of the rest, with a minimum of 16
* buffers. We allocate 1/2 as many swap buffer headers as file
* i/o buffers.
* If necessary, determine the number of pages to use for the
* buffer cache. We allocate 1/2 as many swap buffer headers
* as file I/O buffers.
*/
if (bufpages == 0) {
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / (10 * CLSIZE);
else
bufpages = (btoc(2 * 1024 * 1024) + physmem) /
(20 * CLSIZE);
if (bufcache == 0) { /* use old algorithm */
/*
* Determine how many buffers to allocate. We use 10%
* of the first 2MB of memory, and 5% of the rest, with
* a minimum of 16 buffers.
*/
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)
nbuf = 16;
}
/*
* XXX stopgap measure to prevent wasting too much KVM on
* the sparsely filled buffer cache.
*/
if (nbuf * MAXBSIZE > VM_MAX_KERNEL_BUF)
nbuf = VM_MAX_KERNEL_BUF / MAXBSIZE;
if (nswbuf == 0) {
nswbuf = (nbuf / 2) &~ 1; /* force even */
if (nswbuf > 256)
@ -484,9 +515,9 @@ allocsys(v)
return v;
}
/*
/*
* machine dependent system variables.
*/
*/
int
cpu_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
int *name;
@ -1376,7 +1407,7 @@ do_softclock(arg)
{
softclock();
}
/*
* Network software interrupt routine
*/
@ -1414,4 +1445,3 @@ softnet(arg)
if (isr & (1 << NETISR_PPP)) pppintr();
#endif
}