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Correct some severe VM tuning problems for small systems (<=16MB), and

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improve tuning on larger systems.  (A couple of the VM tuning params for
small systems were so badly chosen that the system could hang under load.)

The broken tuning was originaly my fault.
This commit is contained in:
dyson 1998-02-24 10:16:23 +00:00
parent 4062b72b6c
commit 4730cf91f6
1 changed files with 10 additions and 7 deletions
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17
sys/vm/vm_pageout.c
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@ -65,7 +65,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_pageout.c,v 1.114 1998/02/09 06:11:34 eivind Exp $
* $Id: vm_pageout.c,v 1.115 1998/02/23 08:22:37 dyson Exp $
*/
/*
@ -1163,7 +1163,7 @@ vm_size_t count;
cnt.v_pageout_free_min = (2*MAXBSIZE)/PAGE_SIZE +
cnt.v_interrupt_free_min;
cnt.v_free_reserved = vm_pageout_page_count +
cnt.v_pageout_free_min + (count / 2048) + PQ_L2_SIZE;
cnt.v_pageout_free_min + (count / 768) + PQ_L2_SIZE;
cnt.v_free_min += cnt.v_free_reserved;
return 1;
}
@ -1188,12 +1188,15 @@ vm_pageout()
* free_reserved needs to include enough for the largest swap pager
* structures plus enough for any pv_entry structs when paging.
*/
cnt.v_free_target = 3 * cnt.v_free_min + cnt.v_free_reserved;
if (cnt.v_free_count > 6144)
cnt.v_free_target = 3 * cnt.v_free_min + cnt.v_free_reserved;
else
cnt.v_free_target = 2 * cnt.v_free_min + cnt.v_free_reserved;
if (cnt.v_free_count > 1024) {
cnt.v_cache_max = (cnt.v_free_count - 1024) / 2;
cnt.v_cache_min = cnt.v_free_target * 2;
cnt.v_inactive_target = 2*cnt.v_cache_min + 192;
if (cnt.v_free_count > 2048) {
cnt.v_cache_min = cnt.v_free_target;
cnt.v_cache_max = 2 * cnt.v_cache_min;
cnt.v_inactive_target = (3 * cnt.v_free_target) / 2;
} else {
cnt.v_cache_min = 0;
cnt.v_cache_max = 0;