netdev - Re: [RFC PATCH 00/29] Phase 2 of fib

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Message-Id: <20150227.160117.1055227896487065510.davem@davemloft.net>
Date:	Fri, 27 Feb 2015 16:01:17 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	alexander.duyck@...il.com
Cc:	alexander.h.duyck@...hat.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH 00/29] Phase 2 of fib_trie updates

From: Alexander Duyck <alexander.duyck@...il.com>
Date: Tue, 24 Feb 2015 21:12:48 -0800

> The problem is that the tnodes are now split over 2 cache lines.  As a
> result in order to resize a node, or replace it with the leaf contained
> in the node you end up having to replace the parent of the node as well. 

Therefore I still think that batching the rebalancing across all of the
per-device address removals will help a lot here.

This is true with or without your fib_trie modifications.
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