diff -Nur linux-2.6.3-rc4/fs/dcache.c linux-2.6.3-rc4.hash/fs/dcache.c
--- linux-2.6.3-rc4/fs/dcache.c	2004-02-16 18:21:54.000000000 -0800
+++ linux-2.6.3-rc4.hash/fs/dcache.c	2004-02-17 14:03:21.000000000 -0800
@@ -49,6 +49,7 @@
  */
 #define D_HASHBITS     d_hash_shift
 #define D_HASHMASK     d_hash_mask
+#define D_HASHMAX	(2*1024*1024UL)	/* max number of entries */
 
 static unsigned int d_hash_mask;
 static unsigned int d_hash_shift;
@@ -1531,6 +1532,16 @@
 	return ino;
 }
 
+static __initdata unsigned long dhash_entries;
+static int __init set_dhash_entries(char *str)
+{
+	if (!str)
+		return 0;
+	dhash_entries = simple_strtoul(str, &str, 0);
+	return 1;
+}
+__setup("dhash_entries=", set_dhash_entries);
+
 static void __init dcache_init(unsigned long mempages)
 {
 	struct hlist_head *d;
@@ -1556,11 +1567,14 @@
 	
 	set_shrinker(DEFAULT_SEEKS, shrink_dcache_memory);
 
-#if PAGE_SHIFT < 13
-	mempages >>= (13 - PAGE_SHIFT);
-#endif
-	mempages *= sizeof(struct hlist_head);
-	for (order = 0; ((1UL << order) << PAGE_SHIFT) < mempages; order++)
+	if (!dhash_entries) {
+		dhash_entries = PAGE_SHIFT < 13 ?
+				mempages >> (13 - PAGE_SHIFT) :
+				mempages << (PAGE_SHIFT - 13);
+		dhash_entries = min(D_HASHMAX, dhash_entries);
+	}
+	dhash_entries *= sizeof(struct hlist_head);
+	for (order = 0; ((1UL << order) << PAGE_SHIFT) < dhash_entries; order++)
 		;
 
 	do {
diff -Nur linux-2.6.3-rc4/fs/inode.c linux-2.6.3-rc4.hash/fs/inode.c
--- linux-2.6.3-rc4/fs/inode.c	2004-02-16 18:23:36.000000000 -0800
+++ linux-2.6.3-rc4.hash/fs/inode.c	2004-02-17 14:03:21.000000000 -0800
@@ -53,6 +53,7 @@
  */
 #define I_HASHBITS	i_hash_shift
 #define I_HASHMASK	i_hash_mask
+#define I_HASHMAX	(2*1024*1024UL)	/* max number of entries */
 
 static unsigned int i_hash_mask;
 static unsigned int i_hash_shift;
@@ -1327,6 +1328,16 @@
 		wake_up_all(wq);
 }
 
+static __initdata unsigned long ihash_entries;
+static int __init set_ihash_entries(char *str)
+{
+	if (!str)
+		return 0;
+	ihash_entries = simple_strtoul(str, &str, 0);
+	return 1;
+}
+__setup("ihash_entries=", set_ihash_entries);
+
 /*
  * Initialize the waitqueues and inode hash table.
  */
@@ -1340,9 +1351,14 @@
 	for (i = 0; i < ARRAY_SIZE(i_wait_queue_heads); i++)
 		init_waitqueue_head(&i_wait_queue_heads[i].wqh);
 
-	mempages >>= (14 - PAGE_SHIFT);
-	mempages *= sizeof(struct hlist_head);
-	for (order = 0; ((1UL << order) << PAGE_SHIFT) < mempages; order++)
+	if (!ihash_entries) {
+		ihash_entries = PAGE_SHIFT < 14 ?
+				mempages >> (14 - PAGE_SHIFT) :
+				mempages << (PAGE_SHIFT - 14);
+		ihash_entries = min(I_HASHMAX, ihash_entries);
+	}
+	ihash_entries *= sizeof(struct hlist_head);
+	for (order = 0; ((1UL << order) << PAGE_SHIFT) < ihash_entries; order++)
 		;
 
 	do {
diff -Nur linux-2.6.3-rc4/net/ipv4/route.c linux-2.6.3-rc4.hash/net/ipv4/route.c
--- linux-2.6.3-rc4/net/ipv4/route.c	2004-02-16 18:23:37.000000000 -0800
+++ linux-2.6.3-rc4.hash/net/ipv4/route.c	2004-02-17 14:03:21.000000000 -0800
@@ -2717,6 +2717,16 @@
 #endif /* CONFIG_PROC_FS */
 #endif /* CONFIG_NET_CLS_ROUTE */
 
+static __initdata unsigned long rhash_entries;
+static int __init set_rhash_entries(char *str)
+{
+	if (!str)
+		return 0;
+	rhash_entries = simple_strtoul(str, &str, 0);
+	return 1;
+}
+__setup("rhash_entries=", set_rhash_entries);
+
 int __init ip_rt_init(void)
 {
 	int i, order, goal, rc = 0;
@@ -2743,7 +2753,10 @@
 		panic("IP: failed to allocate ip_dst_cache\n");
 
 	goal = num_physpages >> (26 - PAGE_SHIFT);
-
+	if (!rhash_entries)
+		goal = min(10, goal);
+	else
+		goal = (rhash_entries * sizeof(struct rt_hash_bucket)) >> PAGE_SHIFT;
 	for (order = 0; (1UL << order) < goal; order++)
 		/* NOTHING */;
 
diff -Nur linux-2.6.3-rc4/net/ipv4/tcp.c linux-2.6.3-rc4.hash/net/ipv4/tcp.c
--- linux-2.6.3-rc4/net/ipv4/tcp.c	2004-02-16 18:22:05.000000000 -0800
+++ linux-2.6.3-rc4.hash/net/ipv4/tcp.c	2004-02-17 14:03:21.000000000 -0800
@@ -2570,6 +2570,16 @@
 extern void __skb_cb_too_small_for_tcp(int, int);
 extern void tcpdiag_init(void);
 
+static __initdata unsigned long thash_entries;
+static int __init set_thash_entries(char *str)
+{
+	if (!str)
+		return 0;
+	thash_entries = simple_strtoul(str, &str, 0);
+	return 1;
+}
+__setup("thash_entries=", set_thash_entries);
+
 void __init tcp_init(void)
 {
 	struct sk_buff *skb = NULL;
@@ -2611,6 +2621,10 @@
 	else
 		goal = num_physpages >> (23 - PAGE_SHIFT);
 
+	if (!thash_entries)
+		goal = min(10, goal);
+	else 
+		goal = (thash_entries * sizeof(struct tcp_ehash_bucket)) >> PAGE_SHIFT;
 	for (order = 0; (1UL << order) < goal; order++)
 		;
 	do {