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Date:	Mon, 20 Jul 2009 07:41:13 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH net-next] Re: rib_trie / Fix inflate_threshold_root.
 Now=15 size=11 bits

From: Jarek Poplawski <>
Date: Tue, 14 Jul 2009 20:33:08 +0200

> ipv4: Use synchronize_rcu() during trie_rebalance()
> During trie_rebalance() we free memory after resizing with call_rcu(),
> but large updates, especially with PREEMPT_NONE configs, can cause
> memory stresses, so this patch calls synchronize_rcu() in
> tnode_free_flush() after each sync_pages to guarantee such freeing
> (especially before resizing the root node).
> The value of sync_pages = 128 is based on Pawel Staszewski's tests as
> the lowest which doesn't hinder updating times. (For testing purposes
> there was a sysfs module parameter to change it on demand, but it's
> removed until we're sure it could be really useful.)
> The patch is based on suggestions by: Paul E. McKenney
> <>
> Reported-by: Pawel Staszewski <>
> Tested-by: Pawel Staszewski <>
> Signed-off-by: Jarek Poplawski <>

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