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reduce the total cpu usage of ipt_do_table under high network load from 3.1% down to 1.6% (tested with oprofile)

Browse Source 
SVN-Revision: 15822
v19.07.3_mercusys_ac12_duma
Felix Fietkau 15 years ago
parent 4ab19ddbd5
commit 251a81b192
3 changed files with 129 additions and 0 deletions
Show Stats Download Patch File Download Diff File

43
target/linux/generic-2.6/patches-2.6.28/110-netfilter_match_speedup.patch
Unescape Escape View File

@ -75,3 +75,46 @@
}
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
@@ -332,8 +358,27 @@ ipt_do_table(struct sk_buff *skb,
struct xt_match_param mtpar;
struct xt_target_param tgpar;
- /* Initialization */
ip = ip_hdr(skb);
+
+ read_lock_bh(&table->lock);
+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+ private = table->private;
+ table_base = (void *)private->entries[smp_processor_id()];
+ e = get_entry(table_base, private->hook_entry[hook]);
+ if (e->target_offset <= sizeof(struct ipt_entry) &&
+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
+ struct ipt_entry_target *t = ipt_get_target(e);
+ if (!t->u.kernel.target->target) {
+ int v = ((struct ipt_standard_target *)t)->verdict;
+ if ((v < 0) && (v != IPT_RETURN)) {
+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
+ read_unlock_bh(&table->lock);
+ return (unsigned)(-v) - 1;
+ }
+ }
+ }
+
+ /* Initialization */
datalen = skb->len - ip->ihl * 4;
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
@@ -351,12 +396,6 @@ ipt_do_table(struct sk_buff *skb,
mtpar.family = tgpar.family = NFPROTO_IPV4;
tgpar.hooknum = hook;
- read_lock_bh(&table->lock);
- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- private = table->private;
- table_base = (void *)private->entries[smp_processor_id()];
- e = get_entry(table_base, private->hook_entry[hook]);
-
/* For return from builtin chain */
back = get_entry(table_base, private->underflow[hook]);

42
target/linux/generic-2.6/patches-2.6.29/110-netfilter_match_speedup.patch
Unescape Escape View File

@ -75,3 +75,45 @@
}
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
@@ -328,8 +354,27 @@ ipt_do_table(struct sk_buff *skb,
struct xt_match_param mtpar;
struct xt_target_param tgpar;
- /* Initialization */
ip = ip_hdr(skb);
+
+ read_lock_bh(&table->lock);
+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+ private = table->private;
+ table_base = (void *)private->entries[smp_processor_id()];
+ e = get_entry(table_base, private->hook_entry[hook]);
+ if (e->target_offset <= sizeof(struct ipt_entry) &&
+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
+ struct ipt_entry_target *t = ipt_get_target(e);
+ if (!t->u.kernel.target->target) {
+ int v = ((struct ipt_standard_target *)t)->verdict;
+ if ((v < 0) && (v != IPT_RETURN)) {
+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
+ read_unlock_bh(&table->lock);
+ return (unsigned)(-v) - 1;
+ }
+ }
+ }
+
+ /* Initialization */
datalen = skb->len - ip->ihl * 4;
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
@@ -347,12 +392,6 @@ ipt_do_table(struct sk_buff *skb,
mtpar.family = tgpar.family = NFPROTO_IPV4;
tgpar.hooknum = hook;
- read_lock_bh(&table->lock);
- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- private = table->private;
- table_base = (void *)private->entries[smp_processor_id()];
- e = get_entry(table_base, private->hook_entry[hook]);
-
/* For return from builtin chain */
back = get_entry(table_base, private->underflow[hook]);

44
target/linux/generic-2.6/patches-2.6.30/110-netfilter_match_speedup.patch
Unescape Escape View File

@ -75,3 +75,47 @@
}
#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
@@ -318,8 +344,28 @@ ipt_do_table(struct sk_buff *skb,
struct xt_match_param mtpar;
struct xt_target_param tgpar;
- /* Initialization */
ip = ip_hdr(skb);
+
+ IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+ xt_info_rdlock_bh();
+ private = table->private;
+ table_base = private->entries[smp_processor_id()];
+ e = get_entry(table_base, private->hook_entry[hook]);
+
+ if (e->target_offset <= sizeof(struct ipt_entry) &&
+ (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
+ struct ipt_entry_target *t = ipt_get_target(e);
+ if (!t->u.kernel.target->target) {
+ int v = ((struct ipt_standard_target *)t)->verdict;
+ if ((v < 0) && (v != IPT_RETURN)) {
+ ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
+ read_unlock_bh(&table->lock);
+ return (unsigned)(-v) - 1;
+ }
+ }
+ }
+
+ /* Initialization */
datalen = skb->len - ip->ihl * 4;
indev = in ? in->name : nulldevname;
outdev = out ? out->name : nulldevname;
@@ -337,13 +383,6 @@ ipt_do_table(struct sk_buff *skb,
mtpar.family = tgpar.family = NFPROTO_IPV4;
tgpar.hooknum = hook;
- IP_NF_ASSERT(table->valid_hooks & (1 << hook));
- xt_info_rdlock_bh();
- private = table->private;
- table_base = private->entries[smp_processor_id()];
-
- e = get_entry(table_base, private->hook_entry[hook]);
-
/* For return from builtin chain */
back = get_entry(table_base, private->underflow[hook]);

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