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Improve the caching of small files like directories, while not

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substantially increasing buffer space.  Specifically, we double
the number of buffers, but allocate only half the amount of memory
per buffer.  Note that VDIR files aren't cached unless instantiated
in a buffer.  This will significantly improve caching.
This commit is contained in:
dyson 1996-11-17 02:11:01 +00:00
parent 3e98936b7c
commit 20b553ba68
3 changed files with 8 additions and 8 deletions
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6
sys/amd64/amd64/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.210 1996/11/07 14:43:59 joerg Exp $
* $Id: machdep.c,v 1.211 1996/11/11 20:38:52 bde Exp $
*/
#include "npx.h"
@ -282,9 +282,9 @@ again:
if (nbuf == 0) {
nbuf = 30;
if( physmem > 1024)
nbuf += min((physmem - 1024) / 12, 1024);
nbuf += min((physmem - 1024) / 6, 2048);
}
nswbuf = min(nbuf, 128);
nswbuf = max(min(nbuf/4, 128), 16);
valloc(swbuf, struct buf, nswbuf);
valloc(buf, struct buf, nbuf);

6
sys/i386/i386/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.210 1996/11/07 14:43:59 joerg Exp $
* $Id: machdep.c,v 1.211 1996/11/11 20:38:52 bde Exp $
*/
#include "npx.h"
@ -282,9 +282,9 @@ again:
if (nbuf == 0) {
nbuf = 30;
if( physmem > 1024)
nbuf += min((physmem - 1024) / 12, 1024);
nbuf += min((physmem - 1024) / 6, 2048);
}
nswbuf = min(nbuf, 128);
nswbuf = max(min(nbuf/4, 128), 16);
valloc(swbuf, struct buf, nswbuf);
valloc(buf, struct buf, nbuf);

4
sys/kern/vfs_bio.c
View File

@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.103 1996/10/06 07:50:05 dyson Exp $
* $Id: vfs_bio.c,v 1.104 1996/10/17 03:04:43 dyson Exp $
*/
/*
@ -155,7 +155,7 @@ bufinit()
* cache is still the same as it would be for 8K filesystems. This
* keeps the size of the buffer cache "in check" for big block filesystems.
*/
maxbufspace = 2 * (nbuf + 8) * PAGE_SIZE;
maxbufspace = (nbuf + 8) * PAGE_SIZE;
/*
* reserve 1/3 of the buffers for metadata (VDIR) which might not be VMIO'ed
*/