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Restricted maximum bufpages to 1500; this is required for machines >64MB

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of memory to work without running out of kernel VM (and increasing it to
even more than it is now (96MB) is out of the question. Changed bufpages
calculation to allocation a little less bufer cache (16% of mem-2MB instead
of 20%); this is simply a better figure for most systems.
This commit is contained in:
David Greenman 1994-10-25 08:34:50 +00:00
parent d061325a87
commit 1b55c5bc85
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=3844
2 changed files with 8 additions and 10 deletions
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9
sys/amd64/amd64/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.77 1994/10/19 00:05:59 wollman Exp $ * $Id: machdep.c,v 1.78 1994/10/20 00:07:49 phk Exp $
*/ */
#include "npx.h" #include "npx.h"
@ -258,16 +258,15 @@ cpu_startup()
* We allocate 1/2 as many swap buffer headers as file i/o buffers. * We allocate 1/2 as many swap buffer headers as file i/o buffers.
*/ */
if (bufpages == 0) if (bufpages == 0)
bufpages = ((physmem << PGSHIFT) - 2048*1024) / NBPG / 5; bufpages = ((physmem << PGSHIFT) - 2048*1024) / NBPG / 6;
if (bufpages < 64) if (bufpages < 64)
bufpages = 64; bufpages = 64;
/* /*
* We must still limit the maximum number of buffers to be no * We must still limit the maximum number of buffers to be no
* more than 2/5's of the size of the kernal malloc region, this * more than 750 because we'll run out of kernel VM otherwise.
* will only take effect for machines with lots of memory
*/ */
bufpages = min(bufpages, (VM_KMEM_SIZE / NBPG) * 2 / 5); bufpages = min(bufpages, 1500);
if (nbuf == 0) { if (nbuf == 0) {
nbuf = bufpages / 2; nbuf = bufpages / 2;
if (nbuf < 32) if (nbuf < 32)

9
sys/i386/i386/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE. * SUCH DAMAGE.
* *
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91 * from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.77 1994/10/19 00:05:59 wollman Exp $ * $Id: machdep.c,v 1.78 1994/10/20 00:07:49 phk Exp $
*/ */
#include "npx.h" #include "npx.h"
@ -258,16 +258,15 @@ cpu_startup()
* We allocate 1/2 as many swap buffer headers as file i/o buffers. * We allocate 1/2 as many swap buffer headers as file i/o buffers.
*/ */
if (bufpages == 0) if (bufpages == 0)
bufpages = ((physmem << PGSHIFT) - 2048*1024) / NBPG / 5; bufpages = ((physmem << PGSHIFT) - 2048*1024) / NBPG / 6;
if (bufpages < 64) if (bufpages < 64)
bufpages = 64; bufpages = 64;
/* /*
* We must still limit the maximum number of buffers to be no * We must still limit the maximum number of buffers to be no
* more than 2/5's of the size of the kernal malloc region, this * more than 750 because we'll run out of kernel VM otherwise.
* will only take effect for machines with lots of memory
*/ */
bufpages = min(bufpages, (VM_KMEM_SIZE / NBPG) * 2 / 5); bufpages = min(bufpages, 1500);
if (nbuf == 0) { if (nbuf == 0) {
nbuf = bufpages / 2; nbuf = bufpages / 2;
if (nbuf < 32) if (nbuf < 32)