netdev - Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold

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Message-ID: <4A488EB8.4070602@itcare.pl>
Date:	Mon, 29 Jun 2009 11:51:52 +0200
From:	Paweł Staszewski <pstaszewski@...are.pl>
To:	Jarek Poplawski <jarkao2@...il.com>
CC:	David Miller <davem@...emloft.net>,
	Robert Olsson <robert@...ur.slu.se>,
	Robert Olsson <Robert.Olsson@...a.slu.se>,
	"Jorge Boncompte [DTI2]" <jorge@...2.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Olsson <robert.olsson@....uu.se>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold_root. Now=15
 size=11 bits

I apply this patch

fib_triestats in attached file :)


Jarek Poplawski pisze:
> On 28-06-2009 23:36, Jarek Poplawski wrote:
>   
>> To David Miller:
>> since among patches tested negatively by Pawel are current 2 fixes
>> from 2.6.31-rc, I hope they weren't sent to -stable yet. Otherwise,
>> please withdraw them until they are tested alone. Thanks.
>>     
>
> David, IMHO this fix is needed in net-2.6 even if it doesn't fix the
> problem reported by Pawel (there could be still something more).
>
> Pawel, I see you decided to test my previous patch, but try to add
> this one on top.
>
> Thanks,
> Jarek P.
> ------------------->
> ipv4: Fix fib_trie rebalancing, part 3
>
> Alas current delaying of freeing old tnodes by RCU in trie_rebalance
> is still not enough because we can free a top tnode before updating a
> t->trie pointer.
>
> Reported-by: Pawel Staszewski <pstaszewski@...are.pl>
> Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
> ---
>
>  net/ipv4/fib_trie.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
> index 012cf5a..00a54b2 100644
> --- a/net/ipv4/fib_trie.c
> +++ b/net/ipv4/fib_trie.c
> @@ -1021,6 +1021,9 @@ static void trie_rebalance(struct trie *t, struct tnode *tn)
>  				      (struct node *)tn, wasfull);
>  
>  		tp = node_parent((struct node *) tn);
> +		if (!tp)
> +			rcu_assign_pointer(t->trie, (struct node *)tn);
> +
>  		tnode_free_flush();
>  		if (!tp)
>  			break;
> --
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>
>   


View attachment "fib_triestats.txt" of type "text/plain" (3032 bytes)