[1741] in Release_Engineering
MAXDSIZE in pvax kernel
daemon@ATHENA.MIT.EDU (John Carr)
Fri Oct 6 15:59:51 1989
Cc: akagerry@ATHENA.MIT.EDU
To: rel-eng@ATHENA.MIT.EDU
Date: Fri, 06 Oct 89 15:59:18 EDT
From: John Carr <jfc@ATHENA.MIT.EDU>
With 40 meg swap, a 16 meg max data size in the pvax kernel seems
small. The following patch to sys/vm_page.c will allow the kernel
config file to set the max data size (DMMAX is currently too small to
allow data size much greater than 16 meg):
*** /paris/source/vax/sys/machine/vmparam.h Mon Dec 19 12:44:55 1988
--- vmparam.h Fri Oct 6 15:55:14 1989
***************
*** 54,60 ****
--- 54,62 ----
* With MAXDSIZ of 16Mb and NDMAP of 38, dmmax will be 1024.
*/
#define DMMIN 32 /* smallest swap allocation */
+ #if !defined(DMMAX)
#define DMMAX 4096 /* largest potential swap allocation */
+ #endif
#define DMTEXT 1024 /* swap allocation for text */
/*
Then one need only add to the config file something like:
options DMMAX=8192
options MAXDSIZ=33554432
to allow greater data size.
I have run an RT kernel with this change, and run binaries with > 20 M
data size.
