From: deraadt <deraadt@openbsd.org>
Date: Sat, 14 Dec 1996 15:37:16 +0000 (+0000)
Subject: clamp kvm useage
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=7382dee6b55ac08fec34f2323bb364841bb0388d;p=openbsd

clamp kvm useage
---

diff --git a/sys/arch/sparc/sparc/machdep.c b/sys/arch/sparc/sparc/machdep.c
index 03dc4fc1a3b..e2b195565b3 100644
--- a/sys/arch/sparc/sparc/machdep.c
+++ b/sys/arch/sparc/sparc/machdep.c
@@ -324,18 +324,30 @@ allocsys(v)
 	valloc(msqids, struct msqid_ds, msginfo.msgmni);
 #endif
 
+#ifndef BUFCACHEPERCENT
+#define BUFCACHEPERCENT 5
+#endif
 	/*
 	 * Determine how many buffers to allocate (enough to
 	 * hold 5% of total physical memory, but at least 16).
 	 * Allocate 1/2 as many swap buffer headers as file i/o buffers.
 	 */
 	if (bufpages == 0)
-		bufpages = (physmem / 20) / CLSIZE;
+		bufpages = (physmem / ((100/BUFCACHEPERCENT) / CLSIZE));
+	/* Restrict to at most 70% filled kvm */
+	if (bufpages * MAXBSIZE >
+	    (VM_MAX_KERNEL_ADDRESS-VM_MIN_KERNEL_ADDRESS) * 7 / 10)
+		bufpages = (VM_MAX_KERNEL_ADDRESS-VM_MIN_KERNEL_ADDRESS) /
+		    MAXBSIZE * 7 / 10;
 	if (nbuf == 0) {
 		nbuf = bufpages;
 		if (nbuf < 16)
 			nbuf = 16;
 	}
+#if defined(SUN4C) || defined(SUN4)
+	if ((CPU_ISSUN4C || CPU_ISSUN4) && nbuf > 200)
+		nbuf = 200;
+#endif
 	if (nswbuf == 0) {
 		nswbuf = (nbuf / 2) &~ 1;	/* force even */
 		if (nswbuf > 256)