adjust maximum number of vnodes in vnode cache according

to machine memory size upon boot if the number has not been specified
explicitly in kernel config - at this moment, 0.5% of system
memory is used for vnodes (but minimum NVNODE vnodes)

sys/kern/init_main.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: init_main.c,v 1.174 2000/06/27 17:41:12 mrg Exp $	*/
+/*	$NetBSD: init_main.c,v 1.175 2000/07/06 09:51:55 jdolecek Exp $	*/
 
 /*
  * Copyright (c) 1995 Christopher G. Demetriou.  All rights reserved.
@@ -188,6 +188,9 @@ main()
 #if defined(NFSSERVER) || defined(NFS)
 	extern void nfs_init __P((void));
 #endif
+#ifdef NVNODE_IMPLICIT
+	int usevnodes;
+#endif
 
 	/*
 	 * Initialize the current process pointer (curproc) before
@@ -497,6 +500,17 @@ main()
 	start_init_exec = 1;
 	wakeup((void *)&start_init_exec);
 
+#ifdef NVNODE_IMPLICIT
+	/*
+	 * If maximum number of vnodes in namei vnode cache is not explicitly
+	 * defined in kernel config, adjust the number such as we use roughly
+	 * 0.5% of memory for vnode cache (but not less than NVNODE vnodes).
+	 */
+	usevnodes = (ptoa(physmem) / 200) / sizeof(struct vnode);
+	if (usevnodes > desiredvnodes) 
+		desiredvnodes = usevnodes;
+#endif
+
 	/* The scheduler is an infinite loop. */
 	uvm_scheduler();
 	/* NOTREACHED */

sys/sys/param.h

@@ -1,4 +1,4 @@
-/*	$NetBSD: param.h,v 1.101 2000/06/30 07:44:06 veego Exp $	*/
+/*	$NetBSD: param.h,v 1.102 2000/07/06 09:51:54 jdolecek Exp $	*/
 
 /*-
  * Copyright (c) 1982, 1986, 1989, 1993
@@ -131,6 +131,7 @@
 #endif
 #ifndef NVNODE
 #define	NVNODE (NPROC + NTEXT + 100)
+#define	NVNODE_IMPLICIT
 #endif
 #endif /* _KERNEL */