From a33bc5c15154c835aae26f16e6a3a7d9ad4acb45 Mon Sep 17 00:00:00 2001 From: Neil Horman Date: Thu, 30 Jul 2009 18:52:15 -0700 Subject: xfrm: select sane defaults for xfrm[4|6] gc_thresh Choose saner defaults for xfrm[4|6] gc_thresh values on init Currently, the xfrm[4|6] code has hard-coded initial gc_thresh values (set to 1024). Given that the ipv4 and ipv6 routing caches are sized dynamically at boot time, the static selections can be non-sensical. This patch dynamically selects an appropriate gc threshold based on the corresponding main routing table size, using the assumption that we should in the worst case be able to handle as many connections as the routing table can. For ipv4, the maximum route cache size is 16 * the number of hash buckets in the route cache. Given that xfrm4 starts garbage collection at the gc_thresh and prevents new allocations at 2 * gc_thresh, we set gc_thresh to half the maximum route cache size. For ipv6, its a bit trickier. there is no maximum route cache size, but the ipv6 dst_ops gc_thresh is statically set to 1024. It seems sane to select a simmilar gc_thresh for the xfrm6 code that is half the number of hash buckets in the v6 route cache times 16 (like the v4 code does). Signed-off-by: Neil Horman Signed-off-by: David S. Miller --- net/ipv6/ip6_fib.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) (limited to 'net/ipv6/ip6_fib.c') diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c index 52ee1dced2f..0e93ca56eb6 100644 --- a/net/ipv6/ip6_fib.c +++ b/net/ipv6/ip6_fib.c @@ -164,12 +164,6 @@ static __inline__ void rt6_release(struct rt6_info *rt) dst_free(&rt->u.dst); } -#ifdef CONFIG_IPV6_MULTIPLE_TABLES -#define FIB_TABLE_HASHSZ 256 -#else -#define FIB_TABLE_HASHSZ 1 -#endif - static void fib6_link_table(struct net *net, struct fib6_table *tb) { unsigned int h; @@ -180,7 +174,7 @@ static void fib6_link_table(struct net *net, struct fib6_table *tb) */ rwlock_init(&tb->tb6_lock); - h = tb->tb6_id & (FIB_TABLE_HASHSZ - 1); + h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); /* * No protection necessary, this is the only list mutatation @@ -231,7 +225,7 @@ struct fib6_table *fib6_get_table(struct net *net, u32 id) if (id == 0) id = RT6_TABLE_MAIN; - h = id & (FIB_TABLE_HASHSZ - 1); + h = id & (FIB6_TABLE_HASHSZ - 1); rcu_read_lock(); head = &net->ipv6.fib_table_hash[h]; hlist_for_each_entry_rcu(tb, node, head, tb6_hlist) { @@ -382,7 +376,7 @@ static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) arg.net = net; w->args = &arg; - for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { + for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { e = 0; head = &net->ipv6.fib_table_hash[h]; hlist_for_each_entry(tb, node, head, tb6_hlist) { @@ -1368,7 +1362,7 @@ void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), unsigned int h; rcu_read_lock(); - for (h = 0; h < FIB_TABLE_HASHSZ; h++) { + for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { head = &net->ipv6.fib_table_hash[h]; hlist_for_each_entry_rcu(table, node, head, tb6_hlist) { write_lock_bh(&table->tb6_lock); @@ -1483,7 +1477,7 @@ static int fib6_net_init(struct net *net) if (!net->ipv6.rt6_stats) goto out_timer; - net->ipv6.fib_table_hash = kcalloc(FIB_TABLE_HASHSZ, + net->ipv6.fib_table_hash = kcalloc(FIB6_TABLE_HASHSZ, sizeof(*net->ipv6.fib_table_hash), GFP_KERNEL); if (!net->ipv6.fib_table_hash) -- cgit v1.2.3