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Date: Wed, 01 Jul 2009 11:50:09 +0200
From: Paweł Staszewski <pstaszewski@...are.pl>
To: Jarek Poplawski <jarkao2@...il.com>
CC: Linux Network Development list <netdev@...r.kernel.org>,
Robert Olsson <robert@...ur.slu.se>
Subject: Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold_root. Now=15
size=11 bits
Paweł Staszewski pisze:
> Jarek Poplawski pisze:
>> On Wed, Jul 01, 2009 at 06:36:51AM +0000, Jarek Poplawski wrote:
>>
>>> On Wed, Jul 01, 2009 at 01:31:09AM +0200, Paweł Staszewski wrote:
>>> ...
>>>
>>
>> It looks like Cc was shortened BTW, but I guess at least Robert is
>> interested in this testing, so I add him back.
>>
>> Cheers,
>> Jarek P.
>>
>>
>>>> Yes i can make tests like this.
>>>> My network is splited to test clients and other normal clients
>>>> so it's really no problem to make testing. - if testing clients
>>>> working then traffic from normal clients is also switched to this
>>>> router (but if traffic is not forwarded "like in this case" for
>>>> testing clients then failover switching them to working router )
>>>>
>>>> and other point to make this tests - is that - it is good to have
>>>> all in linux kernel networking working well :)
>>>>
>>> It's extremely nice of you! On the other hand, this type of change
>>> was planned to the net-next to fix possible memory problems, which
>>> might have happened to you as well. So you'd probably experience this
>>> problem in the future (2.6.32) anyway.
>>>
>>> So here is the first of 2 patches (the second in a separate message),
>>> which should be tested separately, each one applied on top of the
>>> 2.6.29.x (vanilla - at least fib_trie.c), after reverting the previous
>>> one. So, they are again all-in-one, to eclude any misunderstanding.
>>>
>>> Btw., I assume there were no oopses, warnings or lockups after those
>>> previous non-working patches - only no routing/forwarding.
>>>
>>>
> Yes on on previous patches there was / no warnings / no oopses or lockups
>
> But now i apply this patch and i make more testing.
> First boot with start of bgpd and - traffic is not forwarded
> So i start to search and make only some routes (static without bgpd)
> thru this host
> And all is working for this host when i make all by static routes.
>
> So i change a little my bgp configuration and make default route to
> only one of my iBGP peers and start bgpd process
> All is working and what is weird is number of routes in kernel table.
> Kernel is learning routes from bgpd but very slowly - really very slowly.
>
> In attached file there are some fib_triestats after 5min of traffic.
>
> Without this patch (normally)
> total size: reported by fib_triestats in less that 1sec is: "Total
> size: 35769 kB"
>
> But with this patch
> Total size is growing up and in 5 min of traffic it grow to only:
> "Total size: 1005 kB"
>
Sorry no attached file.
> Regards
> Paweł Staszewski
>
>>> Thanks,
>>> Jarek P.
>>> ----------> (synchronize take 6 all-in-one for 2.6.29x, .28, or .27)
>>>
>>> diff -Nurp a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
>>> --- a/net/ipv4/fib_trie.c 2009-06-29 05:30:50.000000000 +0000
>>> +++ b/net/ipv4/fib_trie.c 2009-07-01 05:15:37.000000000 +0000
>>> @@ -123,6 +123,7 @@ struct tnode {
>>> union {
>>> struct rcu_head rcu;
>>> struct work_struct work;
>>> + struct tnode *tnode_free;
>>> };
>>> struct node *child[0];
>>> };
>>> @@ -161,6 +162,8 @@ static void tnode_put_child_reorg(struct
>>> static struct node *resize(struct trie *t, struct tnode *tn);
>>> static struct tnode *inflate(struct trie *t, struct tnode *tn);
>>> static struct tnode *halve(struct trie *t, struct tnode *tn);
>>> +/* tnodes to free after resize(); protected by RTNL */
>>> +static struct tnode *tnode_free_head;
>>>
>>> static struct kmem_cache *fn_alias_kmem __read_mostly;
>>> static struct kmem_cache *trie_leaf_kmem __read_mostly;
>>> @@ -385,6 +388,24 @@ static inline void tnode_free(struct tno
>>> call_rcu(&tn->rcu, __tnode_free_rcu);
>>> }
>>>
>>> +static void tnode_free_safe(struct tnode *tn)
>>> +{
>>> + BUG_ON(IS_LEAF(tn));
>>> + tn->tnode_free = tnode_free_head;
>>> + tnode_free_head = tn;
>>> +}
>>> +
>>> +static void tnode_free_flush(void)
>>> +{
>>> + struct tnode *tn;
>>> +
>>> + while ((tn = tnode_free_head)) {
>>> + tnode_free_head = tn->tnode_free;
>>> + tn->tnode_free = NULL;
>>> + tnode_free(tn);
>>> + }
>>> +}
>>> +
>>> static struct leaf *leaf_new(void)
>>> {
>>> struct leaf *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
>>> @@ -495,7 +516,7 @@ static struct node *resize(struct trie *
>>>
>>> /* No children */
>>> if (tn->empty_children == tnode_child_length(tn)) {
>>> - tnode_free(tn);
>>> + tnode_free_safe(tn);
>>> return NULL;
>>> }
>>> /* One child */
>>> @@ -509,7 +530,7 @@ static struct node *resize(struct trie *
>>>
>>> /* compress one level */
>>> node_set_parent(n, NULL);
>>> - tnode_free(tn);
>>> + tnode_free_safe(tn);
>>> return n;
>>> }
>>> /*
>>> @@ -670,7 +691,7 @@ static struct node *resize(struct trie *
>>> /* compress one level */
>>>
>>> node_set_parent(n, NULL);
>>> - tnode_free(tn);
>>> + tnode_free_safe(tn);
>>> return n;
>>> }
>>>
>>> @@ -756,7 +777,7 @@ static struct tnode *inflate(struct trie
>>> put_child(t, tn, 2*i, inode->child[0]);
>>> put_child(t, tn, 2*i+1, inode->child[1]);
>>>
>>> - tnode_free(inode);
>>> + tnode_free_safe(inode);
>>> continue;
>>> }
>>>
>>> @@ -801,9 +822,9 @@ static struct tnode *inflate(struct trie
>>> put_child(t, tn, 2*i, resize(t, left));
>>> put_child(t, tn, 2*i+1, resize(t, right));
>>>
>>> - tnode_free(inode);
>>> + tnode_free_safe(inode);
>>> }
>>> - tnode_free(oldtnode);
>>> + tnode_free_safe(oldtnode);
>>> return tn;
>>> nomem:
>>> {
>>> @@ -885,7 +906,7 @@ static struct tnode *halve(struct trie *
>>> put_child(t, newBinNode, 1, right);
>>> put_child(t, tn, i/2, resize(t, newBinNode));
>>> }
>>> - tnode_free(oldtnode);
>>> + tnode_free_safe(oldtnode);
>>> return tn;
>>> nomem:
>>> {
>>> @@ -983,12 +1004,14 @@ fib_find_node(struct trie *t, u32 key)
>>> return NULL;
>>> }
>>>
>>> -static struct node *trie_rebalance(struct trie *t, struct tnode *tn)
>>> +static void trie_rebalance(struct trie *t, struct tnode *tn, bool
>>> sync)
>>> {
>>> int wasfull;
>>> - t_key cindex, key = tn->key;
>>> + t_key cindex, key;
>>> struct tnode *tp;
>>>
>>> + key = tn->key;
>>> +
>>> while (tn != NULL && (tp = node_parent((struct node *)tn)) !=
>>> NULL) {
>>> cindex = tkey_extract_bits(key, tp->pos, tp->bits);
>>> wasfull = tnode_full(tp, tnode_get_child(tp, cindex));
>>> @@ -999,6 +1022,10 @@ static struct node *trie_rebalance(struc
>>>
>>> tp = node_parent((struct node *) tn);
>>> if (!tp)
>>> + rcu_assign_pointer(t->trie, (struct node *)tn);
>>> +
>>> + //tnode_free_flush();
>>> + if (!tp)
>>> break;
>>> tn = tp;
>>> }
>>> @@ -1007,7 +1034,12 @@ static struct node *trie_rebalance(struc
>>> if (IS_TNODE(tn))
>>> tn = (struct tnode *)resize(t, (struct tnode *)tn);
>>>
>>> - return (struct node *)tn;
>>> + rcu_assign_pointer(t->trie, (struct node *)tn);
>>> + if (sync)
>>> + synchronize_rcu();
>>> + tnode_free_flush();
>>> +
>>> + return;
>>> }
>>>
>>> /* only used from updater-side */
>>> @@ -1155,7 +1187,7 @@ static struct list_head *fib_insert_node
>>>
>>> /* Rebalance the trie */
>>>
>>> - rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
>>> + trie_rebalance(t, tp, true);
>>> done:
>>> return fa_head;
>>> }
>>> @@ -1575,7 +1607,7 @@ static void trie_leaf_remove(struct trie
>>> if (tp) {
>>> t_key cindex = tkey_extract_bits(l->key, tp->pos, tp->bits);
>>> put_child(t, (struct tnode *)tp, cindex, NULL);
>>> - rcu_assign_pointer(t->trie, trie_rebalance(t, tp));
>>> + trie_rebalance(t, tp, false);
>>> } else
>>> rcu_assign_pointer(t->trie, NULL);
>>>
>>>
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>
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View attachment "fib_triestats.txt" of type "text/plain" (1884 bytes)
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