netdev - Re: [PATCH 1/3] inetpeer: Support ipv6 addresses.

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Date:	Mon, 29 Nov 2010 21:53:03 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	xiaosuo@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH 1/3] inetpeer: Support ipv6 addresses.

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 30 Nov 2010 06:42:16 +0100

> Its a bit early in the morning here, I must confess I dont yet
> understand your patch David :)
> 
> As we use a tree, why not using two different trees for ipv4 / ipv6 ?

The "key" just creates a natural ordering in the tree, it's
almost arbitrary except that it must distribute well amongst
the entries.

I currently don't see any reason to make two trees right now.

> I dont understand how computing a 32bit key (sort of hash key) is going
> to help when hash collision happens, with an avl tree.
> Either version of tree (AVL/rbtree) will be expensive to use if depth is
> big (With 2 millions entries, depth is going to be very big). I
> understand you want to get rid of route cache ?

Do we plan to talk to 2 million unique destinations and have active
non-default metrics for each one of them very often?

inet_peer entries will only get created when we need to make
non-default metric settings for a specific destination address.

See that's the thing, it's scope is so much smaller than the existing
routing cache.  It's only going to be used in limited if not
controlled cases.

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