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Date: Thu, 26 Jul 2012 14:06:01 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: alexander.duyck@...il.com
Cc: eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH 00/16] Remove the ipv4 routing cache
From: Alexander Duyck <alexander.duyck@...il.com>
Date: Thu, 26 Jul 2012 11:26:26 -0700
> The previous results were with a slight modifications to your earlier
> patch. With this patch applied I am seeing 10.4Mpps with 8 queues,
> reaching a maximum of 11.6Mpps with 9 queues.
For fun you might want to see what this patch does for your tests,
it should cut the number of fib_table_lookup() calls roughly in half.
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index b64a19c..fc7eade 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -204,9 +204,7 @@ static inline struct fib_table *fib_get_table(struct net *net, u32 id)
{
struct hlist_head *ptr;
- ptr = id == RT_TABLE_LOCAL ?
- &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX] :
- &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
+ ptr = &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX];
return hlist_entry(ptr->first, struct fib_table, tb_hlist);
}
@@ -220,10 +218,6 @@ static inline int fib_lookup(struct net *net, const struct flowi4 *flp,
{
struct fib_table *table;
- table = fib_get_table(net, RT_TABLE_LOCAL);
- if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
- return 0;
-
table = fib_get_table(net, RT_TABLE_MAIN);
if (!fib_table_lookup(table, flp, res, FIB_LOOKUP_NOREF))
return 0;
@@ -245,10 +239,6 @@ static inline int fib_lookup(struct net *net, struct flowi4 *flp,
{
if (!net->ipv4.fib_has_custom_rules) {
res->tclassid = 0;
- if (net->ipv4.fib_local &&
- !fib_table_lookup(net->ipv4.fib_local, flp, res,
- FIB_LOOKUP_NOREF))
- return 0;
if (net->ipv4.fib_main &&
!fib_table_lookup(net->ipv4.fib_main, flp, res,
FIB_LOOKUP_NOREF))
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 44bf82e..bdc0231 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -160,7 +160,7 @@ struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
/* Fallback to FIB local table so that communication
* over loopback subnets work.
*/
- local = fib_get_table(net, RT_TABLE_LOCAL);
+ local = fib_get_table(net, RT_TABLE_MAIN);
if (local &&
!fib_table_lookup(local, &fl4, &res, FIB_LOOKUP_NOREF) &&
res.type == RTN_LOCAL)
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index c1fde53..ddfe398 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -52,16 +52,10 @@ static int __net_init fib4_rules_init(struct net *net)
{
struct fib_table *local_table, *main_table;
- local_table = fib_trie_table(RT_TABLE_LOCAL);
- if (local_table == NULL)
- return -ENOMEM;
-
main_table = fib_trie_table(RT_TABLE_MAIN);
if (main_table == NULL)
goto fail;
- hlist_add_head_rcu(&local_table->tb_hlist,
- &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]);
hlist_add_head_rcu(&main_table->tb_hlist,
&net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]);
return 0;
@@ -169,7 +163,7 @@ static inline unsigned int __inet_dev_addr_type(struct net *net,
if (ipv4_is_multicast(addr))
return RTN_MULTICAST;
- local_table = fib_get_table(net, RT_TABLE_LOCAL);
+ local_table = fib_get_table(net, RT_TABLE_MAIN);
if (local_table) {
ret = RTN_UNICAST;
rcu_read_lock();
@@ -712,11 +706,7 @@ static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifad
},
};
- if (type == RTN_UNICAST)
- tb = fib_new_table(net, RT_TABLE_MAIN);
- else
- tb = fib_new_table(net, RT_TABLE_LOCAL);
-
+ tb = fib_new_table(net, RT_TABLE_MAIN);
if (tb == NULL)
return;
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index a83d74e..65135dd 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -284,9 +284,6 @@ static int fib_default_rules_init(struct fib_rules_ops *ops)
{
int err;
- err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, 0);
- if (err < 0)
- return err;
err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
if (err < 0)
return err;
--
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