netdev - RT metric sharing...

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Date:	Thu, 10 Dec 2009 14:14:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: RT metric sharing...

This topic has come up a few times, but I had a reason to
consider it again.

The routing metrics take up quite a bit of space in the
dst_entry and thus every routing cache entry.

We could save some space with indirection.

Basically my idea is:

1) dst_metrics are maintained in external structure

2) when cache entry is created, read-only dst_metrics object
   is allocated for it

3) any attempt to change the metrics of such a read-only dst_entry
   cow's it, all further writes proceed as normal

We currently have 13 (so 13 * sizeof(u32) == 52) and we're probably
about to get a 14th (for the initial receive window stuff).

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